Polishing machines sheet dimensions up to 16,000 x 3,500 mm, unlimited thickness; 5-head grinding machines Use for grinding tubes, strips and flat staves; In addition, Van Geenen owns a variety of wide-belt machines that can produce an extensive range of cutting parts with unlimited thickness. Please get in touch to find out what the ...

After fine grinding, the mirror was rough polished on the fixed-post machine using a pitch polisher. The Ronchigrams in the photo area show the progress of the mirror from rough polishing through figuring. After the mirror is finished up, I use a diamond stylus to engrave my name, the focal length and the date on the back of the optic.

Much is also unchanged - mirror grinding techniques are very similar to those written up by Porter and Ingalls in the 20´s and 30´s. Many amateur astronomers still choose to fabricate their own instruments, for the pride of accomplishment, the gaining of …

Answer (1 of 5): A good friend of mine, and a member of our astronomy club, has ground and polished TWO 32″ diameter mirrors! Yikes! The first one he made was damaged by the coating company, and so he set about making a second mirror! I have looked through both of them, and the images are just st...

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Mirror (8K) Polishing Machine Mirror Polishing Machine is used to polish Sheet or Plates of Stainless Steel up to Highly Reflective Mirror Effect. The surface receives a uniform and directionless gloss with a magnificent brilliance. After Grinded in Grinding Section, Sheets will feed into the polishing section.

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The mirror machine came to me as a result of astronomical horse-trading, swapping a large GEM mount and a 8" Newtonian OTA for the machine as it was and a start kit consisting of two 6" blanks and the grit, rouge and pitch to manufacture a mirror. The grinding machine had been built to the design of the mirror-o-matic design of Dennis Rech ...

Large Thin Mirror Making by Mel Bartels. Grinding Machines. Mirror-o-matic. Tom Waineo's Desktop Grinding/Polishing Machine. Ken Lilja's Grinding Machine. Grinding Machine. Figuring. Figuring a Paraboidal mirror by thermal predistortion. Optical Testing.

with mirror finish the preparation process must involve several grinding and diamond polishing steps and these have to be performed in a clean workplace. The use of proper working tools facilitates the process a lot. High surface finish reduces the risk of local corrosion and fracture or cracking due to temporary over load-ing or pure fatigue.

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I borrowed a few ideas from the Mirror-O-Matic mirror grinding machine, particularly how to mount the turntable on top of the pulley. Anyone building machinery for cold-working glass should have a look at the MOM web site and plans. There are lots of good ideas there.

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Dennis Rech's comments, inventor of the Mirror-O-Matic mirror grinding machine 'When someone asks me to look at their mirror, I have them send me the parameters of the mirror and then I use a Ronchi program to show them what the Ronchi pattern should look like. We then print out the pattern on my big printer at exact scale and tape it to the ...

Figuring is done by passing a second tool, referred to as a pitch lap, over the mirror by hand while the mirror rotates on the grinding machine. The …

Re: Building a fixed post mirror grinding machine. Update summary: Lots of work to get to this point. Things I need to probably change or fix: My gearing of the DC motor. I will need a slow speed for polishing (5 rpm), and faster speeds for hogging out and fine grinding (15- 30 rpm), so likely need to think about adding a gear reduction.

Zambuto's process using a Mirror-O-Matic machine comes close to generating a properly parabolized mirror simply by following the steps outlined in his spreadsheet. Texereau states that his "group has parabolized a number of mirrors 'automatically,' in effect, by using a team of four or five operators all applying the 'same' stroke."

Mirror grinding machine construction log I started thinking about building my own mirror grinding machine several years ago. Having been on the ATM list now since almost the beginning of it here on the web, I had lots of of inspiration reading …

I had an idle mirror grinding machine (a modified MOM 20), so I volunteered to grind and polish his blanks and check for strain using the cross-polarized light test. Soon, three plate glass blanks arrived, two 10 inch and one 7.5 inch. They looked pretty bad. They showed a lot of strain where Horace had taken a belt sander to them.

The mirror or lens grinding machine is a masterpiece of mechanical engineering. It has several gears in mesh at all times and also has several variable settings built into it.

Finally had a chance to move to finer grinding compound. I'm very impressed with how much manual labor can be taken out of making a mirror with a grinding machine. The methods used here are from Gordon Waites youtube videos that area available for all to see.

Parabolic-mirror-grinding machine. Applications Claiming Priority (1) Application Number Priority Date Filing Date Title; US86695214A US1171174A (en) : : Parabolic-mirror-grinding machine. Publications (1) Publication Number Publication Date ...

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• Grinding ±0.008mm • Lapping ±0.005mm Surface finish, roughness Casting • Die Casting Good 1-2µm • Investment Good 1.5-3 • Sand Casting Poor 12-25 Metal forming • Cold rolling Good 1-3 • Hot rolling Poor 12-25 Machining • Boring Good 0.5-6 • Drilling Medium 1.5-6 • Milling Good 1-6 • Turning Good 0.5-6

Rough grinding is complete for the 12.5 inch honeycomb-back telpe mirror blank. The rough grinding went pretty quickly and painlessly this time. I only have maybe 12 hours of actual work in the mirror so far. It's hard to believe, but the rough grinding has removed over a pound of glass. The mirror now weighs in at only only 8 pounds 15 ounces.

One machine is designed for grinding concave mirrors of small focal length. The other machine, a much larger piece to implement, grinds mirrors of large focal lengths. Though Leonardo da Vinci creates sketches of mirror grinding, one crucial and logical question to ask is whether he used such mirrors in his artwork or drawing.

In this paper, the mirror surface grinding of ceramics, such as Si 3 N 4 and Al 2 O 3 TiC, was realized with average roughness less than 10 nanometers. For the grinding operation, a three-axis CNC grinding machine tool was designed and manufactured.

The true test of the amateur astronomer is building their own telpe. Grinding and polishing your own mirrors is a long, arduous process. Instead of lapping the blank by hand, Laurie Hall built...

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. One more question ...will 1 1/2 shaft size pillow block bearings work good for a homemade EQ mount? Thank you, John

The M-o-M is a marvellous machine due to its simplicity and yet refined design. It is extremely flexible accommodating mirror sizes from 4 inch up to 20 inch (with slight modifications) and can be used for all three steps necessary in producing a mirror. That is you can use it to grind, polish and figure your optics.