A good starter size is the 150 mm 634 mirror. A 200mm 834 will also work. Most ATM books and websites recommend a Pyrex mirror blank, but in my opinion, annealed plate glass is better for this first, 34learn and practice34 is cheaper, it is softer and grinds faster, needing less abrasives and with these small sizes, the low expansion glass like Pyrex has no practical visible atGet Price
After reading an article by Ed Jones about using diamond pellets for that task, I wanted to try the idea on the grinding machine. For that purpose I glued diamond pellets to a plaster tool and used it like a normal grinding tool on the machine. The tool should not be bigger than the diameter of the mirror.
The well used tile tool at right illustrates a couple of maintenance issues. 1. Tiles Grind Away You may grind through your tiles at the edge, especially if you are making a very fast low focal ratio mirror. In that case, you can epoxy a second layer of tiles on over the first. This was done with the tool shown at left. 2.
A solid tool traps abrasive in the center of the mirror and resists grinding the mirror spherical. When you first start a new and smaller abrasive, this shows up as a tendency to form a large bubble in the center, especially in the larger abrasives.
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Want to build your own telescope Start with one of our telescope mirror kits. Each kit comes with a telescope mirror blank and all the abrasives silicon carbide grits and white aluminum oxide powders, cerium oxide polish and pitch to grind and polish it to your specifications.
12 Inch Mirror Blanks, 3434 Thick 69 SampH 16 Shipping prices are to the USA not shipping outside the US, sorry Combined shipping is possible Write For a complete mirror making KIT, with all abrasives, polishing compounds, pitch, and grinding tool included, please see our Buy Telescope Mirror Kits
Grinding the curve into the mirror face can be done by one of the following approaches Ceramic tiled tool ground against the mirror face. Glass tool ground against the mirror face. Ring tool. Motorized grinding wheel on the end of along boom that is anchored that is moved back and forth across the mirror face.
Rough grinding. This step is about making one side of the glass concave. To create a pitch lap, we need to create a plaster or plywood disk the same side as our ceramic tile tool very large mirrors can use smaller pitch laps, wrap the sides with tape and pour liquid lap on it. Build Your Own Telescope Richard Berry How to
A good starter size is the 150 mm 634 mirror. A 200mm 834 will also work. Most ATM books and websites recommend a Pyrex mirror blank, but in my opinion, annealed plate glass is better for this first, 34learn and practice34 is cheaper, it is softer and grinds faster, needing less abrasives and with these small sizes, the low expansion glass like Pyrex has no practical visible at
Much is also unchanged mirror grinding techniques are very similar to those written up by Porter and Ingalls in the 20s and 30s. Many amateur astronomers still choose to fabricate their own instruments, for the pride of accomplishment, the gaining of knowledge and the insurance of quality.
Please see the Buy Telescope Mirror Blanks page for low prices on plate glass mirror blanks. If you39d like to buy a complete mirror grinding KIT, with all abrasives and grinding tool included, please see the Buy Telescope Mirror Kits. website for the lowest prices on plate glass telescope mirror grinding kits.
Basically there are two types of grindingpolishing machine. The traditional type which involves the mirror rotating at a relatively slow speed, a few rpm for a big mirror 1620 inches with the tool moving across the mirror, from side to side, at a higher rpm depending on the size of the mirror andor tool.
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Here is a 25 inch mirror on top of the fine grinding tool with pads applied. And here is the result after 5 hrs of machine polishing starting from a 20 micron aluminum oxide grind. Note that the edge is not as reflective.
Mirror grinding tile tool posted in ATM, Optics and DIY Forum Hi all, Im about to begin crafting a mirror grinding tool out of plaster and tile. In researching how to make the tool, Ive ran across some conflicting instructions. Would I create the tool flat or make it convex in accordance to the final shape of my mirror an 8 f8 parabola
Making A Mirror Grinding Tool By Allen Malsburry The average person would never think, I can make my own telescope. Most amateur astronomers believe, I can buy a better telescope than I can build. Neither is actually correct. For many decades now, amateur astronomers have been building their own telescopes.
For this mirror, I skipped the prepolish step and simply used pads and CeO for initial polish. I used five pads on the 934 grinding tool during the polishing phase. A photograph of the tool appears in Figure 1 at left. This tool was made in my usual manner using tiles attached with paraffin wax. It took about an hour and a half of polishing
My Mirror Grinding Machine. For a long time I39ve wanted to build a machine for grinding telescope mirrors. Dennis Rech39s MoM designs finally inspired me to just get up and do it. Over the years, I39d been collecting motors, gear boxes, pulleys, etc.