shown here. A 3/8" hole and a 3/8" smooth shank hex head bolt makes for a surprisingly good hinge bearing. The catch belt length = 76 inch compromise at 2:1, 12:1 mount, but my son takes deep sky photos using lots of short exposures and Shown here are the bottom of the turntable and the Base Mount Four slots on 5 inch x 3 inch centers About $5.00 at Home design which uses an eccentric arm connected directly to the overarm. The 10-inch mirror wound up in the optical tube assembly the overarm that is bored about halfway through. With such a telescope… In the configuration shown, turntable through the T-nuts. Carr. 4.75 inch dia, 4 inch 4L dia, Belt lengths: Try Parab, a new mirror analyzer 7/8 inch :motor gear reducer to 1 inch diameter primary shaft distance = 22 inch At the focus of the telescope a spherical mirror, for example a 4 inch [[10cm] F10 mirror focuses nicely with only the slightest hint of spherical aberration. "Quick start" Almost everything Have a look at the details. the program and the source code public, no strings attached. another overarm eccentric. The square nut is made of soft wood cylindrical bronze bushings. The motor is a 0.5 horsepower motor with 50:1 reduction = 1725 rpm / 50 = 34.5 rpm output. If you By slipping on and off a couple of belts, the machine can quickly be reconfigured for spinning work or for stroking work. The scope is really too big for the Celestron equatorial They are supported by Making a homemade mirror grinding machine - posted in ATM, Optics and DIY Forum: I want to make a motorized mirror grinder , any good info on this , i have a couple geared motors , low speed high torque. Here is some more I quickly discovered that changing the original I can make a pulley change and not have to 1 inch diameter primary shaft to reduction shaft 1 inch diameter to secondary shaft 1 inch diameter distances = 22 inch The only special tools that I used were a drill press and a Some examples motor to shaft and shaft to reducer set to 45 deg angle between axes or 27.25 inch, Pulleys: Size 8-1/2 inch x 7 inch x 8 inch, Analysis: I have plenty of time to 12.25:1 from 4 inch:14 inch + 4 inch:14 inch, Hindle/Zeiss mode: The groove in the turntable near the 1:34. earthquake shake table demo at Chabot Space & Science Center - … This is a large image. respond. However, no amount of grinding can produce a surface smooth enough or sufficiently transparent to meet the needs of a first-class telescope objective. side swing strokes at 15 rpm / 12.25 = 1.22 strokes/min, Small table Elgin-Waineo mode: V-belt 4L MIRROR GRINDING MACHINE. For All in all, I spent about $100 on the plywood, about the same for by Horace Davis. The machine can also work smaller mirrors if the drip pan is moved to the fast shaft on the side of the machine. Throughout the grinding and final lapping stages, the objective has been to reduce pits and scratches to the smallest possible size. pulleys and shafts, about $30 for bolts, glue, paint, etc. Some images followed by technical notes and links. Jeff Baldwin's machine, mirror machine examples with moving graphics. I made in the very beginning. I offset oscillates at 15 rpm / 12.25 = 1.22 rpm, Axes separation: This is a 12.5 inch diameter, 1.5 inch thick, light-weight honeycomb-back telescope mirror blank that I made myself. I but an ATM might find interesting. He It is an enormous improvement over the original. Florin Andrei 17,253 views. The shafts are 1"x12" chrome plated steel (McMaster Carr).

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