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What did you work on today?

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#4951 bbbriggs

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Posted 09 August 2020 - 04:52 PM

52706C84-4CF0-4145-B165-CC7CB69658E5.jpeg 7EA4517A-F6AC-4120-8E2C-E3ECC5D0EC59.jpeg E7D03508-AA77-4ADF-BFC6-1BEAC5D0E591.jpeg Making more progress.


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#4952 mark77

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Posted 10 August 2020 - 01:10 PM

I cut down trees blocking my westerly view

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#4953 don clement

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Posted 10 August 2020 - 01:38 PM

Worked on modifying the clutch mechanism on the Byers 8" worm gear set for use on the small GEM I am making so it fits on the 2.5" diameter RA shaft. I really like Byers  clutch design as it is floating wrt not putting any sideway force on the RA shaft or worm gear. I am going to replace the six 1/4" Nylon slugs  used as the radial bearing surface between the clutch hub and 4.25" diameter central hole in the aluminum worm gear with Turcite slugs. I will then chuck up the clutch hub in the lathe and in the same holding setup (not removing the clutch hub from chuck) open up the central hole bore to fit a 2.5" diameter shaft, turn the Turcite slugs to fit into the 4.25" hole in the worm gear,  undercut with grooving tool where the Turcite slugs meet the shoulder, and square shoulder surfaces. This way all turned surfaces are concentric and square.

 

 

Don

 

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Edited by don clement, 10 August 2020 - 08:35 PM.

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#4954 jtsenghas

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Posted 11 August 2020 - 09:56 AM

I converted a TELRAD into a TELRUNT yesterday.

 

Details here

 

20200810_161422_compress29.jpg


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#4955 macdonjh

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Posted 11 August 2020 - 12:44 PM

I converted a TELRAD into a TELRUNT yesterday.

 

Details here

 

attachicon.gif20200810_161422_compress29.jpg

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#4956 charlieb123

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Posted Yesterday, 12:43 PM

Today @ lunch I made a bracket to mount a 50mm guide scope to an AT80ED.

 

guidescopemount.jpg


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#4957 charlieb123

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Posted Yesterday, 12:51 PM

Also scrambled together an adapter to mount an HEQ5P to a wood tripod.

 

 

HEQ5P-mntontrip.jpg

Rendering of tripod using the base adapter for wood tripod.

I ordered a bunch of material to make my own (someday).

 

tripodrender.jpg


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#4958 charlieb123

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Posted Yesterday, 12:54 PM

Since I can't seem to find a decent cam anywhere I started designing my own using a Sony IMX291 sensor ($40).

Won't be as great as a ASI but should be adequate guide camera for my cheap DIY AP rig.

 

camera_body_render.jpg


Edited by charlieb123, Yesterday, 12:55 PM.

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#4959 Piero DP

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Posted Yesterday, 05:26 PM

In these days I completed my mirror cell. Triangles are in aluminium, bars and tailgate in stainless steel. Ring and fan board in ABS plastic. Fan is a Noctua 80mm. Glatter's sling.

All metal was cut with a jigsaw. Holes were drilled using a drill + Big Gator tools (great tools btw).

Rungs have a wall thickness of 3mm.

The cell was designed using PLOP.

 

Following post shows another profile. Collimation bolts are in stainless steel. The original M8 thread of the hand knobs was re-tapped for 3/8"-24 (UNF) threaded rod - which was cut too - for making the bolts. Collimation travel is 1/2". Loctite Blue was used for locking the nuts. 

The nuts used for making the side pins bolts and the hand knobs for the collimation bolts were locked with Loctite green.

 

 

Next step: making the UTA. :) 

 

 

 

mirror_cell.jpg


Edited by Piero DP, Yesterday, 05:43 PM.

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#4960 Piero DP

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Posted Yesterday, 05:36 PM

IMG_20200809_124656.jpg


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#4961 bbbriggs

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Posted Yesterday, 07:44 PM

688DE953-D593-45AE-A696-1216C3BC7C4F.jpeg Oops


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#4962 jtsenghas

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Posted Yesterday, 07:49 PM

Nice cutaway sample of a pocket screw! 

(Is the recovery plan to install another nearby and to make a thin face frame? )



#4963 bbbriggs

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Posted Yesterday, 08:26 PM

I am going to screw a 3/4” thick piece of plywood to the top so I will probably just leave it out.



#4964 greenglass

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Posted Yesterday, 08:39 PM

a long dob, 6.2"/95"FL.  almost done the 4 foot long bottom tube out of plywood.  bolting a 4 foot sonotube on it. I wonder how long before it gathers dust for being too big.



#4965 N7GTB

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Posted Today, 12:41 AM

Made a 6" dia pitch lap to begin polishing the mirror...  When I took the second photo, I didn't quite have enough Cerium Oxide layer.  I've added more, and the lap looks considerably more white in color.  I'll need to trim the extra pitch around the edges, but other than that plan to begin polishing soon (tomorrow morning I hope!).

 

 

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#4966 sw196060

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Posted Today, 07:26 AM

a long dob, 6.2"/95"FL.  almost done the 4 foot long bottom tube out of plywood.  bolting a 4 foot sonotube on it. I wonder how long before it gathers dust for being too big.

Nice. Would love to see pics of the project. 



#4967 GLS

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Posted Today, 04:01 PM

I started rough grinding on a 6.25" pyrex blank.  Target is ROC of 32.4" for an F/2.7 mirror.  I have another project ongoing as well.  I have a surplus quartz mirror with a 32" ROC that I picked up surplus over 25 years ago.  A few  years ago, I lowered the curve using the turbo diamond cup manually to 54" and have started fine grinding with a tile tool.  I've put that on hold until I catch up with the 6".  That will lessen chances of grit contamination.  I've got about an hour and half into the smaller mirror and have generated so far a sag of .02" with target of .138". I've used up about 4 oz. of #80.  I've used a pipe flange, a paperweight with pennies on the edge and the diamond cup as ring tools.  Both the flange and cup are awkward to hold, but I solved that by inverting the pipe flange over the diamond cup.  It's working smoothly.  Not having made a mirror in over 25 years, I decided to start out small; the F/2.7 focal length is problematical enough without starting on the 10".  I am tempted to use #40 carbo for a spell.  Gil

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