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Equipment Discussions >> ATM, Optics and DIY Forum

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Z28500
sage


Reged: 02/27/12

Loc: N. 30.1 W.-95.6 Texas
Re: D=103mm F=1575mm Jaegers Homemade Refractor update new [Re: Z28500]
      #6047844 - 08/26/13 10:26 PM Attachment (60 downloads)

Picture of scope mount with laser and weight installed.
Z


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Z28500
sage


Reged: 02/27/12

Loc: N. 30.1 W.-95.6 Texas
Re: D=103mm F=1575mm Jaegers Homemade Refractor update new [Re: Z28500]
      #6047858 - 08/26/13 10:33 PM Attachment (49 downloads)

And the scope mounted. Not a very good picture but I'll get some better shots. It's still not finished yet. Stuill have to finish building the declination brake of which all that's left is veneer and to bolt it on. Take more pics and put it in the magazine.
Z
Z


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Z28500
sage


Reged: 02/27/12

Loc: N. 30.1 W.-95.6 Texas
Re: D=103mm F=1575mm Jaegers Homemade Refractor update new [Re: Z28500]
      #6054601 - 08/30/13 03:07 PM Attachment (41 downloads)

Pretty much finished with the tripod! Except for a little touch up with the airbrush Just finished the declination brake/tension control which is the black and brass round thing with the knob in the center of the tray.
Inside that little round thing which measures at about 2-1/4" tall x about 4-1/2" (it is made out of left over telescope tube I had cut off when I cut the scope tube to length.) Anyway, inside it is a small reverse brake shoe made from a real brake pad from a car's brake custom formed to conform to the outside diameter of the shaft and glued into a brass housing. Pressure is exerted by turning the knob clock wise to increase, and counter clock wise to decrease. Tightening all the way will lock the mount. I have already mentioned that ascension works the same way, that is with a brake pad device mounted on the inside of the fork. It will also lock the fork, or just increase pressure making the mount easy to use.

Z


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Z28500
sage


Reged: 02/27/12

Loc: N. 30.1 W.-95.6 Texas
Re: D=103mm F=1575mm Jaegers Homemade Refractor update new [Re: Z28500]
      #6054615 - 08/30/13 03:14 PM Attachment (30 downloads)

This one is a close up. Gravity is what keeps the brass in place, that and the shaft tube. The brass top is removable, gaining access to the brake parts.

Z


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Z28500
sage


Reged: 02/27/12

Loc: N. 30.1 W.-95.6 Texas
Re: D=103mm F=1575mm Jaegers Homemade Refractor update new [Re: Z28500]
      #6056813 - 08/31/13 10:22 PM Attachment (35 downloads)

I guess it was a pretty messed up thing to do, show the exterior brake/tension control without showing the brake shoe made out of brass and a real brake pad from old Z28 brakes (why I'm Z28500)Anyway, here is the brake pad glued together with JB weld after inserting the pad into a cut out section. It actually locked into the brass before gluing because the brass isn't just rounded, it is also hollowed out about an 1/8" so the pad fits in tightly, I probably didn't have to epoxy it because once against the shaft, it is impossible for it to come out, but since I like overkill,-good 'ole JB Weld!

Z


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Z28500
sage


Reged: 02/27/12

Loc: N. 30.1 W.-95.6 Texas
Re: D=103mm F=1575mm Jaegers Homemade Refractor update new [Re: Z28500]
      #6056814 - 08/31/13 10:23 PM Attachment (31 downloads)

Another shot, The shoe actually puts pressure against the vertical shaft on a machined area on the lower end of the shaft above the lower shaft bearing. The pad was easy to make, just put a piece of fine sandpaper, all the way to about 400 grit on the shaft and then sand the pad on it until it conforms to the same shape, did the same thing to the brass pad housing. The shaft itself isn't just one smooth wall, it has been turned down smaller on each end a couple inches so that the bearings lock in place. I posted a picture of the shaft on top of the center tray last year on the 1st thread, 4th picture/post down (There is also a picture of the ascension brake/tension control on the same page, 7th post down:
http://www.cloudynights.com/ubbthreads/showflat.php?Cat=0&Board=atm&N...

Z


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Z28500
sage


Reged: 02/27/12

Loc: N. 30.1 W.-95.6 Texas
Re: D=103mm F=1575mm Jaegers Homemade Refractor update new [Re: Z28500]
      #6056860 - 08/31/13 11:10 PM Attachment (34 downloads)

Just about finished, Soon I will start on the 6 inch APO. It's that real fast lens from OWL. I've already mocked it up and achieved focus on a star. Some other guys have already built working scopes out of that lens and the pictures they took through the lens were very impressive. The key to a success will be getting the corrector at the right distance then focusing the EP. I plan on utilizing a double crayford focuser configuration I'll have build myself, kinda tricky, but it will be like the corrector will move back and forth like an EP and then the EP itself will also move in and out in a focuser "on a focuser"! all in very close proximity, The EP has to be almost touching the corrector. And to make things even harder, I'm putting in a beamsplitter like the original had. (Already bought a 2 inch beamsplitter)


Z


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Z28500
sage


Reged: 02/27/12

Loc: N. 30.1 W.-95.6 Texas
Re: D=103mm F=1575mm Jaegers Homemade Refractor update new [Re: Z28500]
      #6056867 - 08/31/13 11:15 PM Attachment (52 downloads)

Here is the coolest I've seen that one someone built from those lenses, looks like 1-1/4" focuser though. I going to have to go with 2". And why not? all it is is money! Got to throw it away on something!

Z


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Z28500
sage


Reged: 02/27/12

Loc: N. 30.1 W.-95.6 Texas
Re: D=103mm F=1575mm Jaegers Homemade Refractor update new [Re: Z28500]
      #6084257 - 09/16/13 04:22 PM

Looks like the telescope is going to be in the Sept/Oct issue of Astronomy Technology Today magazine! Maybe even on the cover, not sure. That is if I can get the pictures in by before the end of the week and we're taking them on Wednesday.
Finally, after almost a year & a half.

Z


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dawsonian2000
Carpal Tunnel
*****

Reged: 07/26/06

Loc: Riverview, FL, USA
Re: D=103mm F=1575mm Jaegers Homemade Refractor update new [Re: Z28500]
      #6118153 - 10/04/13 11:10 PM

Hey Z!

That issue rolled out recently! I will be sure to check your article out. Welcome to the club of ATT contributing authors! Congratulations!

Mel


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brewer
newbie


Reged: 10/04/13

Re: D=103mm F=1575mm Jaegers Homemade Refractor update new [Re: glennnnnnn]
      #6118170 - 10/04/13 11:27 PM

I just purchase one refracting telescope on http://refractingtelescopesreview.com,it is great!I need aluminum tubing,but I don't know where to buy it.If you know anything about this,please tell me.

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dawsonian2000
Carpal Tunnel
*****

Reged: 07/26/06

Loc: Riverview, FL, USA
Re: D=103mm F=1575mm Jaegers Homemade Refractor update new [Re: brewer]
      #6118217 - 10/04/13 11:55 PM

Hi Brewer!

There are a number of places you can purchase aluminum tubing from. You just have to check each of the vendors to see there offerings and prices. You can also check out eBay for some deals. In any case, below is a list of vendors I have used before:

Air Flow Systems
Hastings Irrigation Tubing
Speedy Metals

I would also be happy to search around to see if we can find you a great deal. I just need to know the details about the scope you are constructing (i.e., objective size and focal length -- tube diameter and length)

Mel


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Z28500
sage


Reged: 02/27/12

Loc: N. 30.1 W.-95.6 Texas
Re: D=103mm F=1575mm Jaegers Homemade Refractor update new [Re: dawsonian2000]
      #6122627 - 10/07/13 02:31 PM Attachment (32 downloads)

Hi Mel,
Thanks, but I didn't get the pictures in on time. That was something I hadn't anticipated, the photography! It was a lot harder than I expected! A friend of mine is taking the pic's because he has a high resolution camera I'm not to sure about the Christmas issue. Oh well, I've been talking to Gary and he's pretty cool and working with me.
Anyway now all I got left is 3 more scopes to build. A 60mm F/12 with a dual speed 2" focuser, A 155mm Fast Apo, and a 10" Schiefspiegler. The little 60mm will be cool for a grab and go and will pack a punch with the 2" EP. I've already held up a 2" 38mm 5 element to it and wow! I think I'm getting spoiled on 2" oculars.
By the way, the pic here is fully extended, it can be retracted for normal viewing and the silver alum. bar is hidden. But when the scope is straight up then it is desirable to extend it so that the EP is about close to 5 foot off the ground and easy to look through. Normally, I leave it down though. Straight up & extended, it is over 10 foot tall. It's about 5-1/2' to the top of the fork and 5'8" to the top of the brass weight, down and horizontal. Actually, building it with the double inner & outer extension shaft was easier because it enabled me to be able to take it apart real easy, just loosen the locking bolt that just twist-turns off, and lift the fork, ring mount assembly and scope up and out of the tripod. The gear drive is attached to the outer shaft and stays on the tripod. It's easily removed also because although there are 7 gears making up the declination gear drive 2 actually are rubber to steel shaft making the final gear ratio 312:1. Ascension is the same, 312:1. all gears but disengagable by either disengaging the worm gear or by taking the tension off the gear drive or both. The shafts are able to "free spin" or lock, or adjust the drag like on a fishing reel. That way if by accident, too much pressure was put on the gears, like pushing on the scope with the gears engaged, all that happens is the scope moves without the gears getting hurt!. When using the "point and look" feature, the gears are completely disengaged. And lastly the rest of the tripod breaks down easy, all that is necessary is to pull the outer shaft out and twist off the 3 large black round knobs under the tray, it comes out and the tripod legs fold together into a tight skinny section.

Z


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Z28500
sage


Reged: 02/27/12

Loc: N. 30.1 W.-95.6 Texas
Re: D=103mm F=1575mm Jaegers Homemade Refractor update new [Re: Z28500]
      #6122720 - 10/07/13 03:07 PM Attachment (20 downloads)

Right side pic


Z


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Z28500
sage


Reged: 02/27/12

Loc: N. 30.1 W.-95.6 Texas
Re: D=103mm F=1575mm Jaegers Homemade Refractor update new [Re: Z28500]
      #6122723 - 10/07/13 03:08 PM Attachment (23 downloads)

Next scope, a 155mm triplet, dual, dual speed focusing assemblies with planetary bearings, They're not really that hard to make, just a lot of machine work. I have to make three. 2 for the dual focuser, and 1 for the 60mm. It's possible that the corrector focuser may not be dual speed, it's not really necessary. The corrector isn't what does the focusing. I just changes the field of view. With the corrector in close, I believe the F ratio can get over 3.5 but the field of view is a lot less. I've seen this scope get built with the corrector fixed & non adjustable but the original assembly was adjustable and had a beamsplitter. I also have a beamsplitter which is just large enough to use with 2" EP's and not see it's edges, around 46mm
Some of the measurements may be changed, this scope is still in planning stage, I've already drawn the plans over 10 times
I have had this lens in mock up and focused it in on a star. It was a bright white one and there was NO chromatic aberration! It's kinda weird, the closer the corrector is to the objective lens, the farther away the EP is from the corrector. Which means the drawing is not exactly how the scope would be in focus in real time. This is nothing more than a diagram of the mechanics of the scope. Basically, I want the scope to be as nice as the red and silver scope a few posts above. I plan on shiny brass and polished aluminum though. And maybe an aluminum tripod unless I use my Velbon Victory 650.

Z


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Z28500
sage


Reged: 02/27/12

Loc: N. 30.1 W.-95.6 Texas
Re: D=103mm F=1575mm Jaegers Homemade Refractor update [Re: Z28500]
      #6122834 - 10/07/13 03:57 PM Attachment (41 downloads)

And last but not least the focuser, some of you guys may want to copy this, I don't care, that's why I'm putting it up, just a standard crayford with planet bearings. The secret to planet bearings is in the tension adjustment. Properly done, it's as smooth as glass, and I gotta admit, I'm spoiled on the dual speeds. I may even skinny up more on the thin shaft and make an even lower gear ratio! And it'll probably be necessary with that real fast scope anyway!
The lower housing will be shortened and by the way, the 2-3/4" tube assembly is the 60mm scope one of the focusers will be going on. The lower housing on that particular scope will be made out of brass. The tube assembly will probably be changed though with the EP tube being 2-1/2" O.D. and the I.D. being 2". E.P. Tubes are easy to make out of aluminum, in order to get rid of the glare you just put black threaded barrel sleeves inside the tube and stop it where the eyepiece will come into contact with it as the E.P. shoulder is resting on the tube's end!
Flatten the bottom of the tube for the focuser shaft leaving the lip on each end so the tube won't fall out and... done deal!
A precision bearing can used on the left side instead of the bearings in the pic. It is actually easier, all you have to do is order a 1/4" I.D bearing from a bearing site like: http://www.vxb.com/ & the O.D. & thickness doesn't matter, just make the O.D. fit into the knob, that's all. Super simple. You can do the same thing on the planetary side, the bearing just needs to be fixed to the main shaft by it's outer "O.D." by fitting it in tight into the sleeve attached to the main shaft and the I.D has to fit tightly to the small planetary shaft thereby eliminating the loose bearings and also eliminating machine work.

Z


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Z28500
sage


Reged: 02/27/12

Loc: N. 30.1 W.-95.6 Texas
Re: D=103mm F=1575mm Jaegers Homemade Refractor update new [Re: brewer]
      #6125732 - 10/08/13 07:39 PM

Quote:

I just purchase one refracting telescope on http://refractingtelescopesreview.com,it is great!I need aluminum tubing,but I don't know where to buy it.If you know anything about this,please tell me.





Here's a couple more places besides Speedy Metals (which by the way is where I bought the tube for the scope in this thread then turned it down to about .060" on a lathe)

Already painted alum tube:
http://www.parallaxinstruments.com/tubingprice.html

BRASS:
http://www.lewisbrass.com/tubing/round-brass-tubing/

http://www.dgoptical.com/tubing.htm

Fiberglass:
http://www.parksoptical.com/index2.php?cPath=26_136&cat=Fiberglass+Tubes+...

Concrete Forms up to 60 inch diameter!:
http://www.sonotube.com/products/sonotubeconcreteforms/round/sizechart.aspx

I have a bunch more but I didn't want to stick them all on here, I think these are enough. Parallax tubes come already painted which is a plus but I think a $75.00 minimum is mandatory.
I didn't know about the Hastings site, they look pretty cool! I had the Air Flow Systems though, go all the way down to the bottom of the page and there is a 5" splitter, you could put in a couple dielectric mirror's and 2 people could look through at the same time - good for dating! Like 1 glass and 2 straws!
Hey - it's a joke!
Speedy Metals is by far my personal favorite, but the thinnest you can get is .125" (1/8") so a lathe is necessary unless you are just building a small scope, then who cares? I like being able to adjust the thickness of the metal to whatever I want, but that's just me. Others may like having it already painted and not having to do as much work. Some beautiful scopes have been made that way also. Almost every piece of metal you see on this thread for the F/15 I built was purchased from Speedy Metals! Including the brass and the aluminum for the star diagonal.
Are you redoing the scope you just bought? If it is 60mm or less I would go with Speedy Metals. I redid a 60mm a while back and used an aluminum tube and sanded it with 600 grit and polished it and it almost looks like a mirror. I'm going to rebuild it again and put a 2" dual speed focuser on it and polish it again, when I do it I'll start another thread on it entitled something like "Rebuilding a 60mmm F/12 w/2" Focuser to pack a Punch!" or something like that. Anyway, I'm really gonna do it.
Good luck with the tube.

Z


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Z28500
sage


Reged: 02/27/12

Loc: N. 30.1 W.-95.6 Texas
Re: D=103mm F=1575mm Jaegers Homemade Refractor update new [Re: Z28500]
      #6126177 - 10/09/13 12:19 AM Attachment (26 downloads)

Here is another focuser diagram I drew revised a little bit. It's probably the one I'll use except shortened a little bit.
As you can see, it's really not all that hard to build, maybe a little tedious, but not any harder than anything I fabricated on this entire F/15 over the last year and a half. The only thing that's really crucial is that the shafts & bearings have to be PERFECTLY centered. It's possible mistakes can be made, just throw the piece away and make it again!
Z


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dawsonian2000
Carpal Tunnel
*****

Reged: 07/26/06

Loc: Riverview, FL, USA
Re: D=103mm F=1575mm Jaegers Homemade Refractor update new [Re: Z28500]
      #6129971 - 10/10/13 09:52 PM

Hey Z!

Thanks for sharing those great shots of your scope. The OTA reminds me a great deal of the SkyLight 15 refractors. An awesome design, as well.

You have really put your heart and soul into this scope build. The craftsmanship is outstanding!

I would not submit your article until you have good photos. You definitely want readers to see the awesome work you have done on this scope. Have you performed first light yet? If so, how does it perform?

Mel


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Z28500
sage


Reged: 02/27/12

Loc: N. 30.1 W.-95.6 Texas
Re: D=103mm F=1575mm Jaegers Homemade Refractor update new [Re: dawsonian2000]
      #6130354 - 10/11/13 03:11 AM

Quote:

Hey Z!
Have you performed first light yet? If so, how does it perform?

Mel




Hi Mel,
Yes I have taken it out. However, it has been only the moon and stars. To be honest, it was the stars that were the most interesting. For example, point the scope at black sky with a 38mm E.P. which with the 1575 is about 41.44 power. The black sky turns into hundreds of stars, and whats more I've already split some of them! I can sweep the sky and everything is already in focus, from the center to the edge of the lens, especially since being able to fine tune is easier with the dual speed, and one in focus, it stays when sweeping. Having built my first refractor though, one thing I've learned is it's best to "tune" the tube length as long as possible because of the way crayfords are designed with the 2 bearings on each side of the E.P. tube. Some sag with a lot of weight on them. My Crawmach really doesn't really have that problem because I can keep a tight tension on it, it doesn't slip, and is easy to turn, especially with the fine tune. I have a 6' tube on the Crawmach and with the highest power E.P. in the tube, it only sticks out of the focuser body about 3/4", but that's with a star diagonal. Obviously, without that attachment the tube would be much farther out. I have to admit, after I finished building the entire project, I actually cut off 3/4" off the tube because higher power would only focus with the fosuser all the way in. And the "cone of light" is so long it doesn't get blocked by the long focuser tube.
The most fun is using the laser, just point it at whatever, and there it is, right in the center of the E.P! I don't think I have $25 in the whole brass & 5mw laser pen setup.(Brass is really easy to work with)
Anyway, the Jaegers lens is awesome, What a great company. Too bad they don't exist anymore. One of the guys at Surplus Shed told me that they will have more lenses made from the same Jaegers specs since they also bought those AND the lenses from Jaegers! That's an welcome piece of information! Hope they're cheap!
I only have 3 more scope at this time I'm building now that this 103mm is finished, the 60mm F/12 with 2" focuser, the fast dual focuser 155mm, and a schiefspiegler
Well, there it is, a bug they can't give you a pill for and cure. It's called ATM!
Z


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