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Equipment Discussions >> ATM, Optics and DIY Forum

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Dick Jacobson
scholastic sledgehammer


Reged: 12/22/06

Loc: Plymouth, Minnesota, USA
Re: Post your home made scope new [Re: mtb54703]
      #5920204 - 06/14/13 09:18 AM

I see you are from Eau Claire, mtb54703. Will you be at Northwoods Starfest? I'd love to see your scope!!

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greenglass
scholastic sledgehammer
*****

Reged: 01/22/06

Loc: Hamilton. Ontario, Canada
Re: Post your home made scope new [Re: Dick Jacobson]
      #5925775 - 06/17/13 03:29 PM Attachment (119 downloads)

my old dobs

Edited by greenglass (06/17/13 03:31 PM)


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greenglass
scholastic sledgehammer
*****

Reged: 01/22/06

Loc: Hamilton. Ontario, Canada
Re: Post your home made scope new [Re: greenglass]
      #5930112 - 06/19/13 09:36 PM Attachment (95 downloads)

my new dob, got the mirrors back today from O.W.L. Has a 1.25" flat till I get a 1.83"

Edited by greenglass (06/19/13 09:43 PM)


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mfpalmer
journeyman


Reged: 09/03/08

Loc: Colorado, USA
Re: Post your home made scope new [Re: Oscar56]
      #5930203 - 06/19/13 10:19 PM

Grant,

Sorry for the delay. I haven't dared to add up the cost yet. I plan to shortly. I probably could have bought something cheaper, but I have this building itch that had to be scratched. Now I'm thinking about something bigger. Might as well as we've had so many fires in Colorado lately I haven't seen the sky much!

Mark


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nomosnow
sage


Reged: 03/21/11

Loc: Fort Saskatchewan,Ab ,Canada
Re: Post your home made scope new [Re: mfpalmer]
      #5931874 - 06/20/13 06:59 PM Attachment (108 downloads)

This is an under construction picture of my 12.5 inch f-6 Newtonian. Welded plate steel construction 1/4 in steel for the forks and 1/2 steel for the base. Fiber glassed sona tube and a 12 inch Thomas Mathis worm and worm wheel.
I spent many hours manually guiding this scope .
Example picture here of Rosette Nebula ..

http://www.astrobin.com/31138/

Edited by nomosnow (06/20/13 07:01 PM)


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dawsonian2000
Carpal Tunnel
*****

Reged: 07/26/06

Loc: Riverview, FL, USA
Re: Post your home made scope new [Re: nomosnow]
      #5931947 - 06/20/13 08:01 PM

Quote:

This is an under construction picture of my 12.5 inch f-6 Newtonian. Welded plate steel construction 1/4 in steel for the forks and 1/2 steel for the base. Fiber glassed sona tube and a 12 inch Thomas Mathis worm and worm wheel.
I spent many hours manually guiding this scope .
Example picture here of Rosette Nebula ..

http://www.astrobin.com/31138/




Awesome telescope, nomosnow! It is great to see another fork mounted Newtonian out there. Not many owners out there. It must track quite well with that Mathis worm. My 10" f/5.6 fork mount is driven by a repurposed declination drive assembly that was geared for RA tracking use on my fork mount.

My tube is somewhat similar in that I sealed it with epoxy resin.

Again, awesome instrument.


Thanks for sharing!

Mel


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nomosnow
sage


Reged: 03/21/11

Loc: Fort Saskatchewan,Ab ,Canada
Re: Post your home made scope new [Re: dawsonian2000]
      #5934980 - 06/22/13 04:52 PM Attachment (82 downloads)

Here are a few pictures of my 12.5 inch mentioned above when it was completed.Also to be clear this project is a vintage project completed in 1983.

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nomosnow
sage


Reged: 03/21/11

Loc: Fort Saskatchewan,Ab ,Canada
Re: Post your home made scope new [Re: nomosnow]
      #5934982 - 06/22/13 04:53 PM Attachment (50 downloads)

Tangent arm..

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nomosnow
sage


Reged: 03/21/11

Loc: Fort Saskatchewan,Ab ,Canada
Re: Post your home made scope new [Re: nomosnow]
      #5934989 - 06/22/13 04:56 PM Attachment (55 downloads)

Guiding head, off-axis guider. Note the camera was attached by springs . This made it easy to remove and attach in the dark with no threading it worked well .

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nomosnow
sage


Reged: 03/21/11

Loc: Fort Saskatchewan,Ab ,Canada
Re: Post your home made scope new [Re: nomosnow]
      #5934997 - 06/22/13 04:59 PM Attachment (84 downloads)

Now for something completely different...... Back in 1982 i designed my own " goto mount" Actually the project was designed to look for novae by blink comparison.To do blink comparison the same parts of the sky had to be photographed month after month and then compared by projecting the film strips unto a screen with one image alternately on the other off and you would see differences by actually seeing a object blink on and off.It worked great for showing long period varaiables , asteroids , comets etc. The mount carried a 135 mm Tamron lense and an Olmypus camera body giving 10 degree * 15 degree FOV. The RA worm was a Kenton engineering drive and was fitted to the RA shaft with a home made slip clutch. The slewing in the RA axis was through a " free play coupling ". Since the RA drive was on continuosly the RA slew motor positioned the RA axis by turning it against the slip clutch . But to allow tracking it was designed to reverse " and build in free play at the coupling " so as to allow for continuosly uninterupted tracking.
So in operation the computer was turned on and a future start time was entered then the mount would start up and take about 25 pictures of a preprogrammed area of the sky. All features were computer controlled ie shutter control, film advance, dec and ra slewing . At the end of a session it would go to the home position and power down.So all I had to do in the morning was retrieve the film. And all controlled by a ... Commodore Vic 20.
I spent untold hours ironing out the bugs either hardware or software but in the end it worked and positioned itself well enough to superimpose monthly images for blink comparison.


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nomosnow
sage


Reged: 03/21/11

Loc: Fort Saskatchewan,Ab ,Canada
Re: Post your home made scope new [Re: nomosnow]
      #5934998 - 06/22/13 05:01 PM Attachment (55 downloads)

Ra drive and slew motor details.

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nomosnow
sage


Reged: 03/21/11

Loc: Fort Saskatchewan,Ab ,Canada
Re: Post your home made scope new [Re: nomosnow]
      #5935002 - 06/22/13 05:02 PM Attachment (40 downloads)

Upper fork , dec axis and camera details.

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nomosnow
sage


Reged: 03/21/11

Loc: Fort Saskatchewan,Ab ,Canada
Re: Post your home made scope new [Re: nomosnow]
      #5935006 - 06/22/13 05:05 PM Attachment (55 downloads)

Vic 20 and interface hardware 5 k memory

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nomosnow
sage


Reged: 03/21/11

Loc: Fort Saskatchewan,Ab ,Canada
Re: Post your home made scope new [Re: nomosnow]
      #5935011 - 06/22/13 05:07 PM Attachment (57 downloads)

And blinking in action.

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UncleMossy
super member


Reged: 02/08/12

Loc: Downtown Toronto
Re: Post your home made scope new [Re: nomosnow]
      #5935643 - 06/23/13 12:41 AM

Quote:

Vic 20 and interface hardware 5 k memory




Wow. Amazing 80's technology.
Amazing project.
I wonder, in this digital age, when the last time someone went to "retrieve the film".
Are you still using this observatory?

Cheers
Jim

edit.
Then I read your earlier posts and see you're still using film.

Edited by UncleMossy (06/23/13 12:50 AM)


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nomosnow
sage


Reged: 03/21/11

Loc: Fort Saskatchewan,Ab ,Canada
Re: Post your home made scope new [Re: UncleMossy]
      #5935699 - 06/23/13 01:14 AM

Quote:

Quote:

Vic 20 and interface hardware 5 k memory




Wow. Amazing 80's technology.
Amazing project.
I wonder, in this digital age, when the last time someone went to "retrieve the film".
Are you still using this observatory?

Cheers
Jim

edit.
Then I read your earlier posts and see you're still using film.




Thanks Jim
Unfortunately the small domed observatory is not in use today and also I have fully converted to ccd imaging as well.
So I use a scope buggy and usually image from the comfort of my kitchen table.
However the large observatory is the Sunridge observatory which belongs to the Medicine Hat astronomy club and is a going concern today.
Link to the club's site here.
http://nonprofit.memlane.com/astro/


John L


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UncleMossy
super member


Reged: 02/08/12

Loc: Downtown Toronto
Re: Post your home made scope new [Re: nomosnow]
      #5935807 - 06/23/13 02:45 AM

Thanks for the link John.
I've been through Medicine Hat a few times and that would be a great place for an observatory.
Big, dry, clear skies around there.

I see from your astrobin that you also get some pretty good skies in Fort Saskatchewan.
Your nights must be pretty short at this time of year though, but you'll sure get that back in the winter.
Getting that solar scope must have changed everything for your summer observing.

I envy you your northern lights.

Cheers
Jim


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dawsonian2000
Carpal Tunnel
*****

Reged: 07/26/06

Loc: Riverview, FL, USA
Re: Post your home made scope new [Re: nomosnow]
      #5936599 - 06/23/13 03:19 PM

Quote:

Now for something completely different...... Back in 1982 ! designed my own " goto mount" Actually the project was designed to look for novae by blink comparison...




Awesome, nomosnow! Did you find any novae with your system? Old Clyde Tombaugh would probably be happen to put you setup to the test.

Mel


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nomosnow
sage


Reged: 03/21/11

Loc: Fort Saskatchewan,Ab ,Canada
Re: Post your home made scope new [Re: dawsonian2000]
      #5936772 - 06/23/13 05:22 PM

Hi Mel
No I didn't discover anything special. But the blinking really worked well. I was swamped with blinking asteroids. So with the help of Brian Marsden who sent me (free of charge) a book which had the orbital elements of the major asteroids I was able to (usually) plot the the position of a suspected blinker and confirm that it was indeed an asteroid. I used a basic computer program I typed in from Sky and Tel magazine to compute asteroid positions for the particular date and time of the picture.
Long period variables and periodic comets were picked up as well.
It was a fun project but in the end I was swamped with images to blink and ran out of steam.
John


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dawsonian2000
Carpal Tunnel
*****

Reged: 07/26/06

Loc: Riverview, FL, USA
Re: Post your home made scope new [Re: nomosnow]
      #5938723 - 06/24/13 09:18 PM

Hi John,

The story was going great until you mentioned that you ran out of steam. Nevertheless, I can truly understand. Tedious work like that must be rough on the eyes, let alone your patience. But, in many respects, I believe you must have found great fulfillment in finding objects like asteroids that in most cases would been overlooked. And you association with the late great Brian Marsden must have been a grand privilege.

I checked out the link to you images was quite impressed! I love the images of the sun in H-alpha through your Lunt! It is my desire to get one of these scopes as well. The DSO images are awesome too! To avoid getting to far off from the main subject of this thread, I would love to receive a PM from you regarding Lunt recommendations.


Thanks, Mel


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