Leonardo mirror grinding machine (or lens grinding machine) is a masterpiece of mechanical engineering among his inventions. It has several gears in mesh at all times and also has several variable settings built into it. This mirror grinder was most likely designed by Leonardo while he was either investigating the different ways that light ...

 · In order to realize smooth mirror grinding, the envelope trace height he needs to be less than 10-nm rough profile height that is derived from mirror grinding. 5. Active abrasive grains in grinding Fig. 4 shows the models of diamond grain distribution for unit volume and along wheel fringe.

 · The mirror ended up with a very smooth, zone free, nearly spherical figure ready for final figuring. Figure 1: Polishing pads applied to a 9 inch grinding tool. Another local ATM has also tried the polishing pads …

 · Make cardboard dam around mirror's edge. Place protective layer of plastic on mirror face that stretches up to top of cardboard dam. Place 1' square unglazed ceramic tiles (Daltiles) 6mm thick, webbed side …

 · This past weekend I had a few hours to build the base for the overarm and work on the bracket to mount the shaft which will locate the grinding tools. The plan is all of my …

 · Begin grinding concentrating by focusing the center of the mirror to the edge of the tool. However, when having a mirror ground face up, consider using a smaller instrument that is less than or equal to 75% of the mirror diameter. Seventh Phase: Fine Grinding Fine grinding is well known for its long process of grinding.

 · MIRROR GRINDING MACHINE. I made my first mirror grinding and polishing machine over thirty years ago. It used the working principle of the machine illustrated at "A" Fig.3, Page 163, "Amateur Telescope …

 · I have plans to go to 25" as my next mirror for myself and have been wondering what problems I am going to meet if I try a 1" thin mirror at that size, how it is likely to perform and what mounting will be needed. I …

 · In particular, we've been discussing building a fixed post mirror grinding turntable for cutting mirrors up to about a 24inch diameter to spherical. Its only a pipe dream at the moment, but has anyone had …

 · Note that you should always maintain an angle on the edge of the mirror throughout grinding. In case your mirror is too light to sand enough, as is done for small …

 · In this investigation, the ELID grinding process consists of the following three steps: (1) Truing — the super abrasive wheels are trued by an electrical discharge truer (EDT). (2) Pre-dressing — this step is also known as pre-dressing by electrolysis and it is usually performed at a much lower wheel rotation speed and higher electrical settings.

 · Mirror grinding turntable plans/links? - posted in ATM, Optics and DIY Forum: Space is getting tight in the man cave, and I am looking to set up a turntable so I need …

 · Grind with the tool on top in a to and fro pattern, overhanging each end by about 1/6 the mirror diameter. After a half dozen strokes, take a step to one side and repeat. Then spin the tool on top in the opposite …

 · Obtain the right glass. Choose solid grinding tools. Choose the best position to work on mirrors by hand. Grind the back flat. Try and prevent astigmatism. After having the ground and face of the mirror flat through the 220, you are good to begin rough grinding the curve into the mirror. Do some fine grinding.

Mirror Grinding Stand (above) The front view and top views show the Mirror Grinding Stand with its wide base (big enough to walk around on), pedestal, and small top. The top is …

 · Here is a photo of the grinder in operation actually edging a 12.5 inch blank I cast in my kiln. It works! The blank is attached to the 12 inch diameter wood disk with industrial strength, adhesive-backed Velcro. The rough grinding drum very quickly got the edge trued up and round and to the correct diameter with a minimum of effort and drama.

 · Plan view of top of machine. Fig. 2. Side view of top of machine. Fig. 3. Front view of top of machine. Fig. 4. Plan view of drive arrangement. Fig. 5. Side view of drive arrangement. Fig. 6. Details of stroke crank. …

 · Add the usual half teaspoon of grit, sprinkle with water and grind for a couple of minutes, rotating tool and mirror often. Rinse the mirror and inspect the grid lines. If the grid is worn out evenly, you are doing fine. If …

 · The mirror-grinding was conducted as follows, regardless of whether the substrate was rotated or fixed. When the grinding wheel first touched the surface of diamond specimen, the spindle position was maintained without application of any feeding for several minutes (zero-position grinding). The grinding wheel was then fed at a certain rate up ...

Panasonic HDC-SD60 Telescope mirror grinding machine, Grinding 10" pyrex blank for telescope mirror. Newport Glass Works, LTD. Grinding, Polishing and Figuring …. Grinding, Polishing and Figuring . Thin Telescope Mirrors . Abridged from an article appearing … are several ways to support the grinding and polishing machine ….

 · Preferentially grind the mirror back where the wedge is too thick. Then re-grind the mirror back flat. Measure again and repeat until the wedge has disappeared. Wedge can cause astigmatism; the thinner side of the …

 · For a long time I've wanted to build a machine for grinding telescope mirrors. Dennis Rech's M-o-M designs finally inspired me to just get up and do it. Over the years, I'd been collecting motors, gear boxes, …

Woodware Grinding Stand Plans; Mirror Polishing. S*T*A*R Astronomy – Telescope Making Links. How I cut the Glass Mirror Blanks. Grinding Machines. Building a Waineo type …

 · Maximum stroke is 6 inches. The position of the stroke can be adjusted either way of centre over centre, A stabiliser bar holds the stroke arm in position. The following drawings show the design in detail. Fig. 1. …

 · George Willis Ritchey built this mirror grinding machine at the Yerkes Observatory in Williams Bay, Wisconsin, in the late 1890s. Under the sponsorship of George Ellery Hale, the machine was used to grind a series of telescope mirrors starting with a 24-inch and then a 60-inch mirror for a telescope initially intended for the Yerkes Observatory.

 · I bought my first Mirror Kit from Charles Frank in Glasgow, way back when Methuselah was a lad. It had two superb 8.25" Pyrex Blanks, and enough Grinding materials to make a 8" f6 mirror. I did need much more Cerium Oxide polishing agent though, I made so many mistakes trying to Figure it, I kept running out of it.

The first thing you want to do is to flatten one side (it will become the back) by grinding it against a flat piece of glass (e.g. a old window). Marks left from kiln Top surface of a glass blank Dressing the back Carborundun 60 on a …

Telephone: +44 (0) 1268 728077. Stock Specification. All our Mirror Kits contain a Pilkington Float Glass mirror blank and Grinding Tool. These arefinished with fine ground edges. 180 grade first stage ginding powder. …

 · The smaller mirror is used for power wrapping epoxy impregnated fiberglass around mandrels for making tubes and cylindrical components for open trusses. The gearbox is 40 to 1 and cost me $20. …