Aluminum is too soft to allow conventional grinding techniques. Aluminum work hardens. Inability to produce an optical finish. Corrosion of surface, aluminum is highly reactive. Despite all this, the ATMMETALMIRROR group is happily making aluminum mirrors and using them in their telpes with apparent success.

2.1: Grinding Grinding can be defined as the rapid removal of material from a sample either to reduce it to a suitable size or to remove large irregularities from the surface. The grinding wheel or plate typically rotates at a high speed (around 200-1000rpm) and a coarse, bonded abrasive (> 40 µm) is used.

The Joy of Mirror Making Mel Bartels Polishing Polishing a mirror is one of the great joys you will experience as a maker and builder. It's also arguably the most accurate surface made by man or machine. If the mirror is expanded to the size of a football field, then the mirror's surface will be smooth to 1/1000 inch or 1/30 millimeter!

Joy of Mirror Making: Rough Grinding Ceramic tiled tool ground against the mirror face. Glass tool ground against the mirror face. Ring tool. Motorized …

The fine grade silicon carbide abrasive and nylon fibres in grade 2SF (soft & semi-conformable), or in grade 3SF(slightly harder & more durable) imparts a finer / brighter finish. By the end of this process, you should have a smooth, bright satin finish – taking the time to remove imperfections at this stage in mirror finishing will make your ...

$begingroup$ Also, in grinding the precision is far too low to even matter whether you're aiming for a sphere or a parabola. It doesn't matter at all. Don't waste your time making jigs. The emphasis in this stage is not on precision, but on removing glass (rough grinding) and smoothing out the surface (fine grinding).

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This page describes the rough grinding process. Before You Start. Use this checklist to make sure you are ready to start rough grinding: You have selected a mirror diameter and focal ratio, and have use these to calculate a target sagitta.; You have a way to measure sagitta.; You have an appropriate size mirror blank, you have selected a surface to grind, and you have beveled …

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I find a worn out 325 grit is the nicest feel when slurrying the fine side of the jasper to unleash the mirror like polish it leaves. Focusing on making Wild Whetstones I found that Ancient Ocean Jasper is a world class natural sharpening stone, outranking many other softer stones in terms of being impervious to gouging by steel.

A good starter size is the 150 mm (6") mirror. A 200mm (8") 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, "learn and practice" mirror.It 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 …

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Amazingly, the rough grinding has removed over a pound of glass. The mirror now weighs in at only only 8 pounds 15 ounces. Now the fine grinding can begin to clean up the rough surface left by the rough grinding. Photo #3 shows the sequence of abrasive grits that must be used to get from rough grinding, through fine grinding, to polishing.

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The goal of this step is to make the surface of the tube free of welding marks and further polish the already waxed and polished tube to achieve a mirror effect. The mirror finish on stainless steel enhances its appearance and consistency, making its cleaning easier. It also masks the after-effects of welding and hides surface damage, if any.

I'm going to make an example with an astral plate as it's an endgame base often crafted on. As stated in this post by Chris, the worst case scenario for a base is a loss of 7.5% of the base armor. ''Armour provided by base types can now be up to 10% higher [.]''. Astral plates have a base armor value of 711.

Can do mirrors upto 20 inch size. Blue Cotter, Roorkee, Uttarakhand (UK). Contact person: Mr. Dilshad Ali, +91-9917776288. Can do mirrors upto 12 inch size. ATM Knowledge Web. Stellafane Amateur Telpe Making Main Page; The ATMs' workshop by John D. Upton; Mel Bartels' Amateur Telpe Making and The Joy of Mirror Making

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It looks similar to the smaller version of a grinding stone and it has been used since ancient times in the preparation of ayurvedic medicines. It is even useful to make a fine paste of the various ingredients and takes very little time to crush the cooking ingredients to a fine perfect texture as desired.

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The Joy of Mirror Making Mel Bartels. Introduction Rough Grinding Fine Grinding Polishing

Mirror Work Setup and Grinding. The history of the glass I'm working on is described elsewhere on this page. IN mid-July 2005 I got a sheet cut into 6's and 8's. The cutting process produced a lot of glass dust from the circular diamond wet saw. Oddly, the "dust" was more of a powder rather than tiny sharp fragments: similar dust is generated simply by beveling the glass with a …

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The mirror should now be thoroughly washed and the tool removed from it's cleats, and both tool and workbench are cleaned; so that no grain of coarse abrasive will be present to cause scratches when we are fine grinding. The second grade of grit, No. 120, is used in a similar way.

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Making a 33 cm f/4.8 mirror on the Mirror-o-Matic 6: polishing the surface with a pitch lap After 'super fine' grinding, I moved on to polishing the mirror surface, with cerium oxide. I also tested with Ronchi and Foucault tester for sphericity and ...

How to Make Your Own Telpe Mirror: [Fig 1] This is a large piece of glass a woman off Craigslist gave me. It was 40"x40" and 0.75" thick. Its what I decided to use to make the mirror. Cutting it into smaller sections can be difficult but …

31 The Joy of Mirror Making Mel Bartels Rough Grinding The first milestone is putting a …

In this video I am showing you how to make a DIY telpe mirror! This is the second part in the series, showing fine grinding in a step by step tutorial.