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What did you work on today?

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#51 abberation

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Posted 28 February 2015 - 09:14 PM

I bought a green LED light to make a fringe box.

 

Edit:  after testing, it works with a few LEDs flickering, I hope that doesn't effect the function.  Worst case I'll have to swap in some diodes to remove the flicker.

 

Oh, its a General Electric green traffic light, 11 watts, $20.00.

 

Now I need a diffuser some glass and a box so I see an overhead projector in my future.


Edited by abberation, 01 March 2015 - 12:09 AM.


#52 gregj888

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Posted 01 March 2015 - 12:18 AM

Finished an adapter for a gentleman that bought a scope at the clubs garage sale.

 

Also made a (very crude) web page for my Raspberry Pi/IoT based observatory controller. Now to see if I can get it to work with the Pi.

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#53 Sean Cunneen

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Posted 01 March 2015 - 08:47 PM

I spent today assembling, sanding and staining a rocker box for my rebuilt 16" . My 6 year old was stymied by my explanation of wood stain and is convinced that a paint brush is the wrong way to go, that a stain brush would be a better use of my time....



#54 SACK

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Posted 01 March 2015 - 09:18 PM

worked on cell parts



#55 allardster

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Posted 03 March 2015 - 09:10 PM

Calibrating the lasercutter. Once I get the scaling and kerf right, I'll move to scope parts. Can't wait!

 

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#56 abberation

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Posted 04 March 2015 - 12:59 AM

I got a mechanical counter which I will try to use to roughly count my grinding strokes.



#57 sopticals

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Posted 04 March 2015 - 12:59 AM

IMG_2898.JPG A bit of grind time on my 33" f3.8 (might get a lttle faster yet) mirror. Glass tile tool diameter 22", weighs 15kg,  and extra 20kg weights plus body weight applied. Takes some effort to move this one.

 

Stephen.(45deg.S.)


Edited by sopticals, 04 March 2015 - 05:04 AM.

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#58 steveastrouk

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Posted 04 March 2015 - 11:50 AM

Started designing a Manning type SHS, using SurplusShed optics.



#59 han7720

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Posted 05 March 2015 - 02:29 AM

My miniature telescope mirror is almost over.  :D

 

 

 

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Edited by han7720, 05 March 2015 - 02:31 AM.


#60 abberation

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Posted 05 March 2015 - 04:35 AM

I was going to machine a mirror holder for grinding but it turns out the four jaw chuck is for a different lathe so I need to buy a chuck.



#61 Jon Isaacs

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Posted 05 March 2015 - 05:07 AM

I spent some time trying to figure out why my equatorial platform wasn't working..   :(  The lights come on, it makes noise but the roller and motor shafts don't move.. I partially disassembled it do see if the bearings were frozen, they seem free.  

 

Time to Email the manufacturer.. 

 

Jon



#62 MikeAllNight

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Posted 05 March 2015 - 12:47 PM

I recently machined an adapter to put my CG-4 head on an EQ-2 tripod. I took a Machinist class at the community college and this was one of my projects. I think it turned out nice, works great too!

eq-2 cg4 adapter.jpg

 

 


Edited by MikeAllNight, 05 March 2015 - 12:59 PM.

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#63 Pinbout

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Posted 05 March 2015 - 02:02 PM

I got a wire bender from micro-something a lot cheaper than the same one from mcmaster.

 

so I was testing it.

 

IMG_0216.JPG

 


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#64 Pinbout

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Posted 05 March 2015 - 04:15 PM

and since I took the day off cause of all the snow...

 

centered up a new 12.5in blank. going to make a f4.5.

 

centering a 12in blank.jpg


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#65 Sean Cunneen

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Posted 05 March 2015 - 04:30 PM

All week I have been sanding, staining and painting trying to get my 16" rebuilt by March 15th for a possible Messier marathon attempt! I finally finished up last night and now I am on to figuring out strut lengths. I am being hindered by our crazy weather and a crazy job, but I'll get there!



#66 foxtrot9

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Posted 05 March 2015 - 05:31 PM

Creating a Crayford Baseplate for a 130mm (5" newt) in CAD so I can 3D print this piece and Mod a telescope with a 2" GSO focuser with it  :D

Not exact yet but hopefully will be able to get more exact dimensions of the circular diameter of the top hole and screw hole placements.

 

crayfordbase.png


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#67 han7720

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Posted 07 March 2015 - 11:31 AM

Center hole deformation occurred a little after treatment.
So has the additional work.
And mirror finish well  :)

 

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#68 abberation

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Posted 07 March 2015 - 02:45 PM

More flat polishing.

 

I think for my next few, I should grind with 12 and 6 micron grit before I go to Cerium Oxide.

 

That means I need better glass holders which means some lathe work.

 

I have a bit of a disagreement about the material to use, I'm thinking plastic for dimensional stability and easy machining.  The voice of experience says tile or granite but I can't machine it the same way, don't like the idea of relying on grout and I think its just a lot more work.

 

I'm going to price out 6" delrin bar stock to see if I can afford my preference.



#69 Pinbout

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Posted 07 March 2015 - 03:08 PM

hogging out a 12.5in pyrex to a .16 sag ... just used one bottle of auqafina...that's how I measure my time. LOL

 

 

20150307_145855.jpg

 

20150307_145850.jpg



#70 brave_ulysses

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Posted 07 March 2015 - 06:32 PM

worked on getting my autoguider operational. used my lathe to shorten the eyepiece adapter so it would reach focus. not my best day using tools (lots-o-screwups) but i think it turned out ok

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#71 abberation

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Posted 08 March 2015 - 05:55 AM

I think I figured out winspot.

 

I got the nice tight spot diagrams that a Stevick-Paul is supposed to have and got the mirrors packed in pretty tight.

 

My primary to secondary mirror spacing was bigger than I hoped for so its about a foot longer than I expected.

 

It looks like my 8" prototypes are going to pack like a pretty big Newtonian that doesn't break down.

 

I didn't model my 14 3/4" yet, it might wind up 8' long.



#72 roscoe

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Posted 08 March 2015 - 10:53 AM

I got a wire bender from micro-something a lot cheaper than the same one from mcmaster.

 

so I was testing it.

 

 

 

Danny, where did you find that bender??  Do you think it'd bend 1/4" mild steel rod?



#73 Pinbout

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Posted 08 March 2015 - 11:10 AM

 

I got a wire bender from micro-something a lot cheaper than the same one from mcmaster.

 

so I was testing it.

 

 

 

Danny, where did you find that bender??  Do you think it'd bend 1/4" mild steel rod?

 

 

http://www.micromark...ender,8229.html

 

and McMaster sells the other dies to bend larger radii.

 

but the one pin on the arm is loose and makes the bends walk not in parallel so I'm buying a harden shaft from McMaster to the correct size [-.0005] so the bend will produce a lot better results ... :grin:

 

still a lot cheaper than the $372  McMaster sells the same tool.

 

http://www.mcmaster....benders/=w7z1dz



#74 Pinbout

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Posted 08 March 2015 - 02:48 PM

after getting 1/2 way to my sag I had to fillet the edge.

 

 

https://www.youtube....h?v=lGMLJNVXV2c



#75 mconnelley

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Posted 08 March 2015 - 05:33 PM

Hello:

 

   Today, I did the final trim on the elevation bearings of the 1 m project.  The elevation bearings were too thin, so I epoxied another layer of plywood to them to double up their thickness.  That worked great.  However, the plywood pieces I epoxied on were cut oversized so that I'd have some play when it came to alignment.  Today, I used a router with a straight tool with a bearing at the end to trim to new layer to match the existing layer.  

 

  The next step is to modify the flex rocker to accommodate the new width of the telescope, then make new brackets to support the castor wheels.

Cheers

Mike




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