Return to the Cloudy Nights Telescope Reviews home pageAstronomics discounts for Cloudy Nights members
· Get a Cloudy Nights T-Shirt · Submit a Review / Article

Click here if you are having trouble logging into the forums

Privacy Policy | Please read our Terms of Service | Signup and Troubleshooting FAQ | Problems? PM a Red or a Green Gu… uh, User

Equipment Discussions >> ATM, Optics and DIY Forum

Pages: 1 | 2 | 3 | 4 | (show all)
gatorengineer
Carpal Tunnel
*****

Reged: 02/28/05

Loc: Hellertown, PA
Any Interest in an 8" Al Travel Scope group build?
      #6033111 - 08/18/13 03:50 PM

We have some very talented designers and alot of great ideas, any interest in an 8" travel scope group build. Thinking of something that could be waterjetted out of aluminum.. Would need to account for various focal lengths of primaries...

Seeing what people think.


Post Extras: Print Post   Remind Me!   Notify Moderator  
Mirzam
Post Laureate
*****

Reged: 04/01/08

Loc: Lovettsville, VA
Re: Any Interest in an 8" Al Travel Scope group build? new [Re: gatorengineer]
      #6033409 - 08/18/13 06:51 PM

I'll bite. Need to see some ideas though. How about a 1/2 ring UTA with two poles? Lawnmower blade style spider?

JimC


Post Extras: Print Post   Remind Me!   Notify Moderator  
kfrederick
Carpal Tunnel


Reged: 02/01/08

Re: Any Interest in an 8" Al Travel Scope group build? new [Re: Mirzam]
      #6033463 - 08/18/13 07:28 PM

Maybe Danny will do some 3d drawings Of some of the ideas . Maybe a scale of the James Web all folded up for launch then opens up . Just kidding

Post Extras: Print Post   Remind Me!   Notify Moderator  
Mirzam
Post Laureate
*****

Reged: 04/01/08

Loc: Lovettsville, VA
Re: Any Interest in an 8" Al Travel Scope group build? new [Re: kfrederick]
      #6033470 - 08/18/13 07:32 PM

I'll add that f/5 is a good number for a small travel scope. Longer than this requires counterweighting. Shorter requires more sophisticated collimation tools, which add weight. Although you can use the tools as counterweights.

JimC


Post Extras: Print Post   Remind Me!   Notify Moderator  
Pinbout
Postmaster
*****

Reged: 02/22/10

Loc: nj
Re: Any Interest in an 8" Al Travel Scope group build? new [Re: kfrederick]
      #6033563 - 08/18/13 08:38 PM

Quote:

Maybe Danny will do some 3d drawings Of some of the ideas . Maybe a scale of the James Web all folded up for launch then opens up . Just kidding




I could eve animate it and put it on youtube


Post Extras: Print Post   Remind Me!   Notify Moderator  
jwaldo
Smart Mime
*****

Reged: 04/26/04

Loc: Simi Valley, CA
Re: Any Interest in an 8" Al Travel Scope group build? new [Re: Pinbout]
      #6033838 - 08/19/13 12:26 AM Attachment (39 downloads)

I've doodled around a bit with a 6-8" all-aluminum travel dob a bit, never got beyond some half-done 3D models though...

Post Extras: Print Post   Remind Me!   Notify Moderator  
Arjan
super member


Reged: 01/21/09

Loc: Netherlands
Re: Any Interest in an 8" Al Travel Scope group build? new [Re: jwaldo]
      #6033950 - 08/19/13 03:46 AM

If you want to save a bit more on weight, you could get rid of the focuser-side trunnion and replace it with a 1/2" or so axle?

Post Extras: Print Post   Remind Me!   Notify Moderator  
Pinbout
Postmaster
*****

Reged: 02/22/10

Loc: nj
Re: Any Interest in an 8" Al Travel Scope group build? new [Re: Arjan]
      #6034066 - 08/19/13 07:29 AM

Like a litescope

Post Extras: Print Post   Remind Me!   Notify Moderator  
kfrederick
Carpal Tunnel


Reged: 02/01/08

Re: Any Interest in an 8" Al Travel Scope group build? new [Re: Pinbout]
      #6034536 - 08/19/13 12:57 PM

Because every part and every hole drilled can be done on the CNC Jet [If people wont ] And compound curves or anything that can be drawn can be made very accurate .003 . Go wild .Danny looks great your work You need a CHief . Hope you come down some time

Post Extras: Print Post   Remind Me!   Notify Moderator  
Arjan
super member


Reged: 01/21/09

Loc: Netherlands
Re: Any Interest in an 8" Al Travel Scope group build? new [Re: Pinbout]
      #6034697 - 08/19/13 02:40 PM

Yes, for example like Litescope or like Toshimi Taki

Edited by Arjan (08/19/13 02:43 PM)


Post Extras: Print Post   Remind Me!   Notify Moderator  
gatorengineer
Carpal Tunnel
*****

Reged: 02/28/05

Loc: Hellertown, PA
Re: Any Interest in an 8" Al Travel Scope group build? new [Re: Arjan]
      #6035147 - 08/19/13 06:36 PM

was actually hoping to come up with an aluminum version of this in the 8" size... Jetted out of 0.25" aluminum and tig welded together..... maybe even anodized......

http://www.sumerianoptics.com/products/alkaid/


Post Extras: Print Post   Remind Me!   Notify Moderator  
polaraligned
professor emeritus


Reged: 12/26/08

Re: Any Interest in an 8" Al Travel Scope group build? new [Re: gatorengineer]
      #6035345 - 08/19/13 08:38 PM

I would definitely be into a well designed 8" travelscope.
I can donate CNC mill time to the cause.
I like the sumerian optics scope, but think a single pole would be easier setting up. Now if we could design a telescoping pole that was stiff enough, that would be huge. I can't make the mirror myself, but would like a quality f/4 mirror. Maybe cellular if some amateur casters want to get into the game...


Post Extras: Print Post   Remind Me!   Notify Moderator  
Dave O
sage
*****

Reged: 12/21/11

Loc: Sri Lanka
Re: Any Interest in an 8" Al Travel Scope group build? new [Re: gatorengineer]
      #6035407 - 08/19/13 09:24 PM

Looks a lot like the scope shown by bertb, message #4495943 in this thread: http://www.cloudynights.com/ubbthreads/showflat.php?Cat=0&Board=atm&N...

Would aluminum be stiff enough?

Wonder how he did the trusses?


Post Extras: Print Post   Remind Me!   Notify Moderator  
Arjan
super member


Reged: 01/21/09

Loc: Netherlands
Re: Any Interest in an 8" Al Travel Scope group build? new [Re: gatorengineer]
      #6035814 - 08/20/13 03:13 AM

Quote:

was actually hoping to come up with an aluminum version of this in the 8" size... Jetted out of 0.25" aluminum and tig welded together..... maybe even anodized......

http://www.sumerianoptics.com/products/alkaid/




Ah! Nothing wrong with a Dutch design...


Post Extras: Print Post   Remind Me!   Notify Moderator  
Arjan
super member


Reged: 01/21/09

Loc: Netherlands
Re: Any Interest in an 8" Al Travel Scope group build? new [Re: Dave O]
      #6035819 - 08/20/13 03:26 AM

Quote:

Wonder how he did the trusses?



IMHO, trusses are usually over-designed, there's a lot of weight to save. A German design even uses lightweigth foldable rules, 8 of them apparently made it stiff enough.


Post Extras: Print Post   Remind Me!   Notify Moderator  
Pinbout
Postmaster
*****

Reged: 02/22/10

Loc: nj
Re: Any Interest in an 8" Al Travel Scope group build? new [Re: Arjan]
      #6035912 - 08/20/13 06:59 AM

and then there's teeter's design

http://www.youtube.com/watch?v=2kCitl8BHUM

rob contacted mr.sumerian but mr. sumerian didn't want to license his designs. whatever.


Post Extras: Print Post   Remind Me!   Notify Moderator  
Dave O
sage
*****

Reged: 12/21/11

Loc: Sri Lanka
Re: Any Interest in an 8" Al Travel Scope group build? new [Re: Arjan]
      #6036154 - 08/20/13 10:12 AM

Quote:

Quote:

Wonder how he did the trusses?



IMHO, trusses are usually over-designed, there's a lot of weight to save. A German design even uses lightweigth foldable rules, 8 of them apparently made it stiff enough.




My goodness! I'd have never even considered that! If those folding rules truly are stiff enough to support the upper cage, I think that they would be a tough choice to beat as far as convenience for packing is concerned? Surely the design could be improved upon -- but perhaps there is no need? Certainly easy enough to procure. Thanks for sharing that bit of intel.


Post Extras: Print Post   Remind Me!   Notify Moderator  
Pinbout
Postmaster
*****

Reged: 02/22/10

Loc: nj
Re: Any Interest in an 8" Al Travel Scope group build? new [Re: Dave O]
      #6036172 - 08/20/13 10:23 AM

Quote:

Certainly easy enough to procure.




and if you mess up measuring their lengths...


Post Extras: Print Post   Remind Me!   Notify Moderator  
kfrederick
Carpal Tunnel


Reged: 02/01/08

Re: Any Interest in an 8" Al Travel Scope group build? new [Re: Pinbout]
      #6036337 - 08/20/13 12:00 PM

One thought is interlocking plates to build the tube they could be hinged so each is short . When interlocked should be strong optical tube . Or tripod legs they slide into them self and make short poles . Just ideas .

Post Extras: Print Post   Remind Me!   Notify Moderator  
Chriske
Kijkerbouw Urania
*****

Reged: 08/15/04

Loc: Boechout, Belgium
Re: Any Interest in an 8" Al Travel Scope group build? new [Re: Arjan]
      #6036361 - 08/20/13 12:07 PM

Quote:

Quote:

Wonder how he did the trusses?



IMHO, trusses are usually over-designed, there's a lot of weight to save. A German design even uses lightweigth foldable rules, 8 of them apparently made it stiff enough.




We tested the foldable rules. It was not stiff enough. While rotating the rocker the scope flexed quit a lot and did not return to its 'starting point', as expected.


Post Extras: Print Post   Remind Me!   Notify Moderator  
Arjan
super member


Reged: 01/21/09

Loc: Netherlands
Re: Any Interest in an 8" Al Travel Scope group build? new [Re: Chriske]
      #6036371 - 08/20/13 12:14 PM

Yeah, but there's a lot of room between 20mm alu tubes and el-cheapo rules...

The hysteresis apparently is not due to lack of stiffness? Maybe the mounting on the ends does it.

Edited by Arjan (08/20/13 12:17 PM)


Post Extras: Print Post   Remind Me!   Notify Moderator  
Chriske
Kijkerbouw Urania
*****

Reged: 08/15/04

Loc: Boechout, Belgium
Re: Any Interest in an 8" Al Travel Scope group build? new [Re: Arjan]
      #6036490 - 08/20/13 01:13 PM

Hi,

dunno were Danny is located, but maybe he could make these drawings using Imperial I could redo them using metric values...? Just a thought...

Hope it helps starting this project.


Post Extras: Print Post   Remind Me!   Notify Moderator  
Pinbout
Postmaster
*****

Reged: 02/22/10

Loc: nj
Re: Any Interest in an 8" Al Travel Scope group build? new [Re: Chriske]
      #6036591 - 08/20/13 02:06 PM Attachment (29 downloads)

Quote:

dunno were Danny is located,




I right here...

take this *.txt file and rename it *.kmz and put it in google earth

[wow I renamed the *.kmz to a txt file uploaded it as usual and something turned it into a zip file containing the a *.kmz file with all the locations saved. ]

Edited by Pinbout (08/20/13 02:08 PM)


Post Extras: Print Post   Remind Me!   Notify Moderator  
Arjan
super member


Reged: 01/21/09

Loc: Netherlands
Re: Any Interest in an 8" Al Travel Scope group build? new [Re: Pinbout]
      #6036712 - 08/20/13 03:06 PM

Quote:

rob contacted mr.sumerian but mr. sumerian didn't want to license his designs. whatever.




You could go to the source: Strock 250
Here you will find what you need. Maybe not exactly the same but the similarity is obvious...

Edit: At closer look, the Sumerian is a much more elaborated design, where everything has been done to minimize the collapsed size. IMHO this seems to come at the cost of a more complicated setup. Probably a matter of taste, but the one holiday experience with my boxed dob gave me second thoughts about that.

Edited by Arjan (08/20/13 03:33 PM)


Post Extras: Print Post   Remind Me!   Notify Moderator  
Pinbout
Postmaster
*****

Reged: 02/22/10

Loc: nj
Re: Any Interest in an 8" Al Travel Scope group build? new [Re: Arjan]
      #6036754 - 08/20/13 03:27 PM

Quote:

Quote:

rob contacted mr.sumerian but mr. sumerian didn't want to license his designs. whatever.




You could go to the source: Strock 250
Here you will find drawings in PDF. Maybe not exactly the same but the similarity is obvious...




that's not to a known scale. I have the pdf and the hand drawings. I scaled it up, but there are so many details not in the drawing, which would have to be R&D'd if thats what your starting with.

If you licsense Mr. Sumerian's designs everything is already thought out, less design work. after the first run you could ask for the rights to modify the design.


Post Extras: Print Post   Remind Me!   Notify Moderator  
Arjan
super member


Reged: 01/21/09

Loc: Netherlands
Re: Any Interest in an 8" Al Travel Scope group build? new [Re: Pinbout]
      #6036797 - 08/20/13 03:51 PM

Maybe, but you'd need to R&D anyway to convert it to Aluminium?

Post Extras: Print Post   Remind Me!   Notify Moderator  
kfrederick
Carpal Tunnel


Reged: 02/01/08

Re: Any Interest in an 8" Al Travel Scope group build? new [Re: Arjan]
      #6036857 - 08/20/13 04:18 PM

The water jet will cut anything .Wood plastic carbon fiber so go wild

Post Extras: Print Post   Remind Me!   Notify Moderator  
bertb
member


Reged: 10/10/08

Loc: Achterveld, the Netherlands
Re: Any Interest in an 8" Al Travel Scope group build? new [Re: kfrederick]
      #6036928 - 08/20/13 05:03 PM

My trusses are made of aluminium, 8mm diameter, there are six, each 4 parts, connected with M7 threatparts.
My telescope holds collimation well. However, the construction is a bit fragile, but does the job well during hollydays.


Post Extras: Print Post   Remind Me!   Notify Moderator  
Dave O
sage
*****

Reged: 12/21/11

Loc: Sri Lanka
Re: Any Interest in an 8" Al Travel Scope group build? new [Re: bertb]
      #6037361 - 08/20/13 09:54 PM

Quote:

My trusses are made of aluminium, 8mm diameter, there are six, each 4 parts, connected with M7 threatparts.
My telescope holds collimation well. However, the construction is a bit fragile, but does the job well during hollydays.




Ah, thanks for that bit of information bertb.

If one threaded cables inside the struts and then put them under tension (compressing the struts) would that stiffen them up, or would high frequency vibrations become an issue? Thinking perhaps some design where the cable is permanantly threaded through the strut segments and when relaxed the segments would 'fold' up into a compact size. Perhaps two struts share one cable with a common tensioning device located between them (at the vertex where the two struts meet).

As Kevin F. mentions, a water-jet can cut most anything, was thinking perhaps some form of carbon fiber honeycomb material? Or aluminum honycomb? I think CF would be more durable ... not sure how to bond the pieces together though, epoxy? Cost may be a big factor as well, no idea of the price or availability of those materials.


Post Extras: Print Post   Remind Me!   Notify Moderator  
Pinbout
Postmaster
*****

Reged: 02/22/10

Loc: nj
Re: Any Interest in an 8" Al Travel Scope group build? new [Re: kfrederick]
      #6037393 - 08/20/13 10:26 PM

Quote:

The water jet will cut anything .Wood plastic carbon fiber so go wild




the guy I deal with says it will stain the wood. even if you seal it before hand it still will stain the wood.


Post Extras: Print Post   Remind Me!   Notify Moderator  
Chriske
Kijkerbouw Urania
*****

Reged: 08/15/04

Loc: Boechout, Belgium
Re: Any Interest in an 8" Al Travel Scope group build? new [Re: Pinbout]
      #6037668 - 08/21/13 02:46 AM

Hi,

I just informed whether we can use a local travelscope here in Belgium to use as a starting point. It's a very nice and small one, only 6" high. I'll keep you informed.
Here at Urania Observatory we have our own design but our travelscope is to high to be used for this project.

@ Danny,
Why not design a completely new one. In my opinion it is more difficult to 'transform' a wooden one into an alu version compared to design a new one.

The trusses could be made in parts. The best option is to connect the trusses' parts using the Manfrotto system. No play at all, very stiff and sturdy.


Post Extras: Print Post   Remind Me!   Notify Moderator  
Pinbout
Postmaster
*****

Reged: 02/22/10

Loc: nj
Re: Any Interest in an 8" Al Travel Scope group build? new [Re: Chriske]
      #6037767 - 08/21/13 06:35 AM

here's some ideas on compression rings for telescoping poles. $$$$

or clamps for telescoping poles

Edited by Pinbout (08/21/13 06:38 AM)


Post Extras: Print Post   Remind Me!   Notify Moderator  
Chriske
Kijkerbouw Urania
*****

Reged: 08/15/04

Loc: Boechout, Belgium
Re: Any Interest in an 8" Al Travel Scope group build? new [Re: Pinbout]
      #6037792 - 08/21/13 07:03 AM

Hi Danny,

Lot of $$$$$ signs there...

I was thinking of self-made connection studs. Something like these :

Very simple to make, very stiff, very strong yet very cheap..!















Post Extras: Print Post   Remind Me!   Notify Moderator  
Pinbout
Postmaster
*****

Reged: 02/22/10

Loc: nj
Re: Any Interest in an 8" Al Travel Scope group build? new [Re: Chriske]
      #6037797 - 08/21/13 07:09 AM

yeah, that looks like my bogen boom arm connectors, but on my bogen there was a ring around the middle to keep them together and one side had angles starting from the middle and thinner on the edges.

Post Extras: Print Post   Remind Me!   Notify Moderator  
gatorengineer
Carpal Tunnel
*****

Reged: 02/28/05

Loc: Hellertown, PA
Re: Any Interest in an 8" Al Travel Scope group build? new [Re: Pinbout]
      #6039083 - 08/21/13 08:20 PM

For the connectors it would be easy to turn some round bar stock to just under, and then tap the center. DJ light connectors.... Wish there were more hours in a day

Post Extras: Print Post   Remind Me!   Notify Moderator  
Chriske
Kijkerbouw Urania
*****

Reged: 08/15/04

Loc: Boechout, Belgium
Re: Any Interest in an 8" Al Travel Scope group build? new [Re: gatorengineer]
      #6039543 - 08/22/13 03:20 AM

Quote:

For the connectors it would be easy to turn some round bar stock to just under, and then tap the center. DJ light connectors...




Never seen it ( I think), explain please..


Post Extras: Print Post   Remind Me!   Notify Moderator  
Ps191
super member
*****

Reged: 06/17/09

Loc: E.OR.
Re: Any Interest in an 8" Al Travel Scope group build? new [Re: gatorengineer]
      #6040060 - 08/22/13 12:40 PM

Quote:

We have some very talented designers and alot of great ideas, any interest in an 8" travel scope group build. Thinking of something that could be waterjetted out of aluminum.. Would need to account for various focal lengths of primaries...

Seeing what people think.




Would I be interested-yes-possible. Would like more information, like estimated size of travel package and planed ease/time of the setup and breakdown.

Here are some general thoughts, in no particular order.
- I would prefer a tool less setup and breakdown.
- If not designed carefully aluminum (in areas like rocker box) has little advantage over wood for a 8" scope, even a travel scope.
- Speaking of rocker boxes why have one? Why not have the poles (truss or otherwise) and altitude bearing fastened directly to the “mirror cell”.
- Are we stuck with using only aluminum? Maybe carbon fiber for truss poles, like the shafts from arrows. Even well designed wood components for a group build travel scope could work as good (or better) then aluminum. Wood may also be cheaper and make it easier to find someone willing to CNC from plywood.
- The big advantage of a 'single pole' design is when the pole becomes big enough, to fit the optics inside
- I suggest a string secondary holder, or an upper ring that is designed for multiple types of secondary holders so builders can have their choice.
- Dan from crawford machining may be interested in helping build some of the parts. I believe he helped with the SS127 refractor group build. Dennis from dobstuff may be able to help with select components too. (Disclaimer - I have no affiliation, (or even bought products from) the two afore mentioned businesses, but they seem to be willing to help atm’ers)
- I would like to see a design were the poles can fit inside the primary package. Having a ‘cube’ with most of the telescope components and then a separate package that is long, skinny and unwieldy seems to defeat the idea of a travel scope.

Comments/questions? I may have more thoughts and ideas to add later.


Post Extras: Print Post   Remind Me!   Notify Moderator  
Pinbout
Postmaster
*****

Reged: 02/22/10

Loc: nj
Re: Any Interest in an 8" Al Travel Scope group build? new [Re: Ps191]
      #6040177 - 08/22/13 01:41 PM

Quote:

- Dan from crawford machining may be interested in helping build some of the parts. I believe he helped with the SS127 refractor group build. Dennis from dobstuff may be able to help with select components too. (Disclaimer - I have no affiliation, (or even bought products from) the two afore mentioned businesses, but they seem to be willing to help atm’ers)





I would not like to see a "professional telescope maker" be involved.


Post Extras: Print Post   Remind Me!   Notify Moderator  
Arjan
super member


Reged: 01/21/09

Loc: Netherlands
Re: Any Interest in an 8" Al Travel Scope group build? new [Re: Pinbout]
      #6040307 - 08/22/13 03:05 PM

How about a machining service like this one?
Does anybody know one with a good Q/$ ratio?


Post Extras: Print Post   Remind Me!   Notify Moderator  
Chriske
Kijkerbouw Urania
*****

Reged: 08/15/04

Loc: Boechout, Belgium
Re: Any Interest in an 8" Al Travel Scope group build? new [Re: Arjan]
      #6041276 - 08/23/13 06:05 AM

Hi,

I think it would be logic to first make a 'paper' telescope. Once all parts are drawn and the telescope has passed the collitiontest in a 3D drawing software tool, then you start deciding whether parts will be selfmade or not(we even print some parts these days).
Here at Urania we designed a few scopes and telescopeparts of our owne. In most cases a lot of fellow amateurs came up with good suggestions and ideas to fill in their own needs. Next one or even two people build a prototype, that's the only way to encounter and find solutions for growing-pains. I think thats the way to start such a large project.
While assembling the scope(in your 3D software tool) you have to open two assembly windows. One to work with the actual scope and the other assembly window is the one were the scope is folded down for transport. So you can keep track whether all parts fit in the two 'versions'.

This is one of the scope we've designed at our local observatory. I myself did all the drawing while listening to all remarks from all fellow amateurs involved in this project. It took us a while to overcome all problems. This 10" f/6 scope is completely selfmade, even the focuser is own design(another project were all fellow amateur were involved to give comments and suggestions).
Our scope is way to large for this CN project, it measures 400x400x400mm (16"x16"x16") It was our goal to make a travelscope not to make it as small as possible.

I'm trying to say here such a project needs much more work compared to 'simple' scope. You actually build two projects, one working scope and a collapsed one.

Hope it helps. And I'd like to participate in this project if my willing hands are accepted.


Post Extras: Print Post   Remind Me!   Notify Moderator  
Pinbout
Postmaster
*****

Reged: 02/22/10

Loc: nj
Re: Any Interest in an 8" Al Travel Scope group build? new [Re: Chriske]
      #6041508 - 08/23/13 09:40 AM

Chriske,
what was the red inline skate wheel for?


Post Extras: Print Post   Remind Me!   Notify Moderator  
Chriske
Kijkerbouw Urania
*****

Reged: 08/15/04

Loc: Boechout, Belgium
Re: Any Interest in an 8" Al Travel Scope group build? new [Re: Pinbout]
      #6041553 - 08/23/13 10:07 AM

Danny,

If you look closely (and go back one page in the link) You'll notice 2 of these units in that scope. These are DSC, also selfmade. As encoder we use the internal hardware cannibalized from old MS-mice.

Guy, our Elec-guru even made a small PCB for this project. The software we use is from D. Eck.

The bleu colored parts in these DSC-units are selfmade casted resin 'brackets'. Using selfmade (casted) sprockets our largest error during action is about 0.5°.


Post Extras: Print Post   Remind Me!   Notify Moderator  
Pinbout
Postmaster
*****

Reged: 02/22/10

Loc: nj
Re: Any Interest in an 8" Al Travel Scope group build? new [Re: Chriske]
      #6042107 - 08/23/13 03:57 PM

I got mine down to 12"x12"x5.5" for an 8in mirror. but in the end I made it a little larger [by 1"] to be safe, to make sure everything fits.

designing the model

the model

the result


Post Extras: Print Post   Remind Me!   Notify Moderator  
davidpitre
Post Laureate
*****

Reged: 05/10/05

Loc: Central Texas
Re: Any Interest in an 8" Al Travel Scope group build? new [Re: Pinbout]
      #6042470 - 08/23/13 08:57 PM

I'd sure be interested if it was a 10".

Post Extras: Print Post   Remind Me!   Notify Moderator  
Pinbout
Postmaster
*****

Reged: 02/22/10

Loc: nj
Re: Any Interest in an 8" Al Travel Scope group build? new [Re: davidpitre]
      #6042607 - 08/23/13 10:21 PM

So would I.

Post Extras: Print Post   Remind Me!   Notify Moderator  
gatorengineer
Carpal Tunnel
*****

Reged: 02/28/05

Loc: Hellertown, PA
Re: Any Interest in an 8" Al Travel Scope group build? new [Re: Pinbout]
      #6043132 - 08/24/13 08:04 AM

Danny nice job as usual, is there an easy way to get 2d drawings out of sketchup? Does sketchup have the ability to export in a format to feed a cnc machine? Thanks

Post Extras: Print Post   Remind Me!   Notify Moderator  
Pinbout
Postmaster
*****

Reged: 02/22/10

Loc: nj
Re: Any Interest in an 8" Al Travel Scope group build? new [Re: gatorengineer]
      #6043168 - 08/24/13 08:46 AM

I'd have to mod it with the flat artwork included. But you have to mod it again for 1/4"thk mat'l

Post Extras: Print Post   Remind Me!   Notify Moderator  
steveastrouk
super member


Reged: 08/01/13

Loc: Rochdale, UK
Re: Any Interest in an 8" Al Travel Scope group build? new [Re: gatorengineer]
      #6043276 - 08/24/13 10:09 AM

Yes, extracting flat surfaces is fairly easy. My son and I built a model from Sketchup here
Instructables

Extracted flat surfaces that ended up as DXF files.


Post Extras: Print Post   Remind Me!   Notify Moderator  
Pinbout
Postmaster
*****

Reged: 02/22/10

Loc: nj
Re: Any Interest in an 8" Al Travel Scope group build? new [Re: steveastrouk]
      #6043286 - 08/24/13 10:17 AM

That's an awesome project.

How did you use the led tape?


Post Extras: Print Post   Remind Me!   Notify Moderator  
Chriske
Kijkerbouw Urania
*****

Reged: 08/15/04

Loc: Boechout, Belgium
Re: Any Interest in an 8" Al Travel Scope group build? new [Re: Pinbout]
      #6043385 - 08/24/13 11:11 AM

Hi,

This is the travelscope designed by Guy and his crew of University Ghent, the one I was talking about earlier in this thread. As long as its source is always mentioned it can be used freely. This one is a 10". A 12" is also available.



Post Extras: Print Post   Remind Me!   Notify Moderator  
PierreDesvaux
Vendor (Dobsonian Factory)


Reged: 11/06/06

Loc: Paris, France
Re: Any Interest in an 8" Al Travel Scope group build? new [Re: Chriske]
      #6043641 - 08/24/13 01:40 PM

There are almost one hundred 10" Travel scopes built according to the concept developped by Pierre Strock, 10 years ago, in 2003: 7 kg including optics and one box with a volume of 44 x 36 x 16 cm


Pictures deleted by Richard7
All details for the construction are here. It can be easily adapted for a 8" one:

http://www.astrosurf.com/magnitude78/TelStrock/index.html

Edited by richard7 (08/26/13 04:04 PM)


Post Extras: Print Post   Remind Me!   Notify Moderator  
steveastrouk
super member


Reged: 08/01/13

Loc: Rochdale, UK
Re: Any Interest in an 8" Al Travel Scope group build? new [Re: PierreDesvaux]
      #6043859 - 08/24/13 04:06 PM

I like Mel Bartels' ZipDob. Might be a bit too fast for the current discussion though

Post Extras: Print Post   Remind Me!   Notify Moderator  
Pinbout
Postmaster
*****

Reged: 02/22/10

Loc: nj
Re: Any Interest in an 8" Al Travel Scope group build? new [Re: PierreDesvaux]
      #6043918 - 08/24/13 04:51 PM

Quote:

There are almost one hundred 10" Travel scopes built according to the concept developped by Pierre Strock,




he's already been mentioned along with his pdf and hand drawn sketches.


Post Extras: Print Post   Remind Me!   Notify Moderator  
Pinbout
Postmaster
*****

Reged: 02/22/10

Loc: nj
Re: Any Interest in an 8" Al Travel Scope group build? new [Re: Chriske]
      #6043922 - 08/24/13 04:54 PM

Quote:

This is the travelscope designed by Guy and his crew of University Ghent




I'd like to see the cell...


Post Extras: Print Post   Remind Me!   Notify Moderator  
Pinbout
Postmaster
*****

Reged: 02/22/10

Loc: nj
Re: Any Interest in an 8" Al Travel Scope group build? new [Re: steveastrouk]
      #6043933 - 08/24/13 04:58 PM

Quote:

I like Mel Bartels' ZipDob.




this one?

http://sketchup.google.com/3dwarehouse/details?mid=f1eaaf10973bdc94bfd7348943...


Yeah I've been thinking about more of a robotics scope that unfolds and sets itself up, even collimates itself, secondary and primary. haven't looked at the prices of the micro servo motors yet.


Post Extras: Print Post   Remind Me!   Notify Moderator  
Pinbout
Postmaster
*****

Reged: 02/22/10

Loc: nj
Re: Any Interest in an 8" Al Travel Scope group build? new [Re: PierreDesvaux]
      #6043946 - 08/24/13 05:05 PM

https://sites.google.com/site/dobson2005/dobson400fd3,7

ah this is very beautiful, indeed.


Post Extras: Print Post   Remind Me!   Notify Moderator  
Chriske
Kijkerbouw Urania
*****

Reged: 08/15/04

Loc: Boechout, Belgium
Re: Any Interest in an 8" Al Travel Scope group build? new [Re: Pinbout]
      #6044067 - 08/24/13 06:56 PM

I've only a 2D sketch to show.
I asked Guy to send me the 3D files.



Post Extras: Print Post   Remind Me!   Notify Moderator  
steveastrouk
super member


Reged: 08/01/13

Loc: Rochdale, UK
Re: Any Interest in an 8" Al Travel Scope group build? new [Re: Pinbout]
      #6044819 - 08/25/13 09:12 AM

Yeah, That 'un. I used the aforementioned tools to strip DXFs from SketchUp and had one of my interns make a laser-cut mockup to see how it hung together last year.

Here's a link, FYI
Picasa link

....and there's a picture of me holding one of Drew Aurigema's ceramic foam cored mirrors - that's an 18"


Post Extras: Print Post   Remind Me!   Notify Moderator  
Pinbout
Postmaster
*****

Reged: 02/22/10

Loc: nj
Re: Any Interest in an 8" Al Travel Scope group build? new [Re: Chriske]
      #6044824 - 08/25/13 09:14 AM

Looks like there's plenty of room to turn the collimation bolts around for front collimating.

Post Extras: Print Post   Remind Me!   Notify Moderator  
Pinbout
Postmaster
*****

Reged: 02/22/10

Loc: nj
Re: Any Interest in an 8" Al Travel Scope group build? new [Re: Chriske]
      #6044970 - 08/25/13 10:59 AM Attachment (7 downloads)

i was playing around with a foldable single truss arm 8inf6 that could be mounted to lets say a dm6?

just a thought, not that happy with the web but...


Post Extras: Print Post   Remind Me!   Notify Moderator  
careysub
Carpal Tunnel
*****

Reged: 02/18/11

Loc: Rancho Cucamonga, CA
Re: Any Interest in an 8" Al Travel Scope group build? new [Re: gatorengineer]
      #6045042 - 08/25/13 11:44 AM

There are different theories of what a "travel scope" is.

All imply a scope that is light and compact relative to its aperture, but can have some very different criteria.

One is to have a scope that packs into itself to make a travel case. If you are going on an airline this would have to be carry on luggage and would have to fall under the weight and dimension restrictions of most airlines. An excellent example of this is the 10" Strock scope. This design is so good that if one wants this type of scope one would need to cast about for a really good reason not to use it.

(After posting I came up with a reason: according to Pierre the travel configuration is 36 cm wide. Checking the carry on baggage restrictions of American and Delta I find that their width restriction is 33 and 35 cm respectively, so they wouldn't let you carry it on assuming they impose this restriction accurately. Being forced to check this in the luggage hold would be a disaster, though cabin-checking might be possible.)

Another is simply to minimize over-all scope weight, and have it break down into small enough components to pack easily. This allows you put it in sufficiently tough luggage for checked baggage (though you have the option of carrying on some components). Gary Seronik's 15 lb 8" Aussie scope in the March S&T of this year is an example.

A distinct design objective is simplicity in some sense. No one wants a scope that is complex to set up, but a component minimizing, or a pop-up design (cf the ZipDob) is a different criterion that may drive up weight, volume, or complexity of design and build.

If you aren't taking it on airlines then criteria are relaxed, but then, why would not any of a number of commercial small-medium scopes work as well?

BTW, for the mirror for an 8" travel a good source would be to cannibalize the Orion 203mm f/4.9 Reflector Tube which lists for $300. It is a good focal length, not too short, not too long, and not too expensive (plus you get a 2" Crayford, the secondary, and a finder shoe). The mirror cell is heavy so you would want to remount it.

Edited by careysub (08/25/13 01:45 PM)


Post Extras: Print Post   Remind Me!   Notify Moderator  
cpr1
professor emeritus
*****

Reged: 03/24/12

Loc: Louisiana
Re: Any Interest in an 8" Al Travel Scope group build? new [Re: careysub]
      #6045127 - 08/25/13 12:48 PM

Some very interesting ideas here! Great info.

Post Extras: Print Post   Remind Me!   Notify Moderator  
careysub
Carpal Tunnel
*****

Reged: 02/18/11

Loc: Rancho Cucamonga, CA
Re: Any Interest in an 8" Al Travel Scope group build? new [Re: Chriske]
      #6045280 - 08/25/13 02:16 PM

Quote:

Quote:

For the connectors it would be easy to turn some round bar stock to just under, and then tap the center. DJ light connectors...




Never seen it ( I think), explain please..




He probably means these:
http://www.fullcompass.com/product/408818.html?utm_source=googleps&utm_me...

DJ makes other lighting strut clamps also, but this one looks like the most suitable for this purpose.


Post Extras: Print Post   Remind Me!   Notify Moderator  
gatorengineer
Carpal Tunnel
*****

Reged: 02/28/05

Loc: Hellertown, PA
Re: Any Interest in an 8" Al Travel Scope group build? new [Re: Pinbout]
      #6045282 - 08/25/13 02:17 PM

May have found collapsable truss poles. Repurposed trekking poles. Sierra trading has some on clearance for $20 a pair... Yeah I know its $80 for 8 but. if they work it still wouldnt be bad.

Post Extras: Print Post   Remind Me!   Notify Moderator  
Pinbout
Postmaster
*****

Reged: 02/22/10

Loc: nj
Re: Any Interest in an 8" Al Travel Scope group build? new [Re: gatorengineer]
      #6045308 - 08/25/13 02:31 PM

thats not bad, I saw some at campmore, since its "up the street" I always check out their camping equimp, and theirs is more than that.

all I always fight with using 8 angle alum vs round tube since the angles would pack a lot tighter than the round tubes since they stack on themselves.
but its so ugly...

even with a wood case design I still think it should ride in a padded softshell.

they remind me of wooden field cameras and I never just threw my 4x5 Zone vI walnut field camera in the backseat without having it in a padded bag.

and having it in a padded case you can drop the top which takes up space and just use a regular ground board. a lot tighter case.

so that brings me to make an ultra light instead of a suitcase box.


Post Extras: Print Post   Remind Me!   Notify Moderator  
Pinbout
Postmaster
*****

Reged: 02/22/10

Loc: nj
Re: Any Interest in an 8" Al Travel Scope group build? new [Re: gatorengineer]
      #6045884 - 08/25/13 08:20 PM

I still think a split truss makes a great travel package. remove two sets of trusses and the bottom cell and top uta ring pack up the center pivot box.

http://sketchup.google.com/3dwarehouse/details?mid=167488e723ef733e793d59b883...

it's just how do you mount it, get an astrogoods foldable base?

for traveling the "box" would be pretty small.


Post Extras: Print Post   Remind Me!   Notify Moderator  
kfrederick
Carpal Tunnel


Reged: 02/01/08

Re: Any Interest in an 8" Al Travel Scope group build? new [Re: Pinbout]
      #6161970 - 10/28/13 07:49 AM Attachment (9 downloads)

Mark What you drawing up for the water jet cut travel telescope ? Now you see how nice it cuts wood . Any ideas Mark is drawing it up now .

Post Extras: Print Post   Remind Me!   Notify Moderator  
Pages: 1 | 2 | 3 | 4 | (show all)


Extra information
2 registered and 18 anonymous users are browsing this forum.

Moderator:  ausastronomer, richard7, Starman81 

Print Thread

Forum Permissions
      You cannot start new topics
      You cannot reply to topics
      HTML is disabled
      UBBCode is enabled


Thread views: 2139

Jump to

CN Forums Home


Cloudy Nights LLC
Cloudy Nights Sponsor: Astronomics