>Herb's Glass & an 8-inch mirror
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 …
>Telpe Mirror Making
The rotating table set up for a 6" mirror. The central pin is a 1/4x20 bolt. Two of the furniture glides are shown. For a 12" mirror, I just used smaller blocks. I use a rotating table for fine grinding and polishing. Rubber feet on the bottom of the base are all it needs to keep it in place on the kitchen counter.
>Mirror-Making Workshop - Texas Star Party
You should provide your own materials including mirror, mirror tool and pitch lap, abrasives, etc. We will have some instruction sessions, about an hour or more each day on: Set up & rough grinding: includes Getting set up/overview, Making the Tile Tool, Rough grinding; Fine grinding: includes Fine grinding, Measuring Sagitta; Polishing ...
>Build your own telpe part 1: The mirror – Thomas ...
The problem with thin mirrors is that they flex more easily during grinding and polishing, making it hard to achieve the required surface precision. They also need a more complex mirror cell (additional support points).
>Jan van Gastel: Making a mirror-o-matic mirror making machine
Grinding On the picture below the machine is fine grinding an 8 inch mirror with an 71% tool (143 mm diameter) and 9 micron aluminium oxyde. The bent lines on the mirror are the effect of the tool turning - with respect to the mirror - faster at the central part of the mirror as compared to the edge zones.
>Fine Grinding a 20" Quartz Telpe Mirror - YouTube
Gordon Waite shows some steps during fine grinding of the 20" mirror. As the grind progresses through the grades of abrasives, see the technique Gordon uses...
>An Introduction to the Optics Manufacturing Process
blank. A lens is then blocked and undergoes further grinding to improve the surface and shape. Polishing is the final fine grinding stage where the surface and shape of the optic is finished to specification. The optic is then centered and bevels are put on the edges. Typically the optic is then coated and it is ready to be used in a system ...
>How to Make Your Own Telpe Mirror - Instructables
After your finished with fine grinding the mirror you will need to make yet another tool. This tool is called a pitch lap. It is made the same way as the penny tool you made to do the fine grinding except instead of pennies you will use "Pitch". [Fig 6] Here is a photo that shows the tool being pressed against the warmed pitch.
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>Stellafane ATM: Mirror Making Overview
Mirror grinding and figuring consists of four major steps (plus aluminizing). Rough and Fine grinding use hard tools (glass, tile or metal) and harder then glass abrasive grit (Silicon Carbide or Aluminum Oxide). Polishing and Figuring use a soft pitch tool and ultra fine abrasive (Cerium Oxide or Rouge).
>Waite Research :: 15" F4.5 Telpe Mirror
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.
>Swayze Optical! - Home Page
Grinding and polishing the mirror is the most difficult part of making a telpe. And the most critical. Mirror-making is a hobby that has been around for many years, and many people have put their hands to the task, but it is time consuming, requiring a great deal of skill, patience and perseverence. Especially when the mirror gets big.
>How to Build a Telpe - IUCAA
Depending on the weight used, the technique, the grit etc. the rough grinding of a mirror 12.5 cm � 20 cm diameter can be completed in 2-5 hours (with 12-15 wets per hour). 2.6 Fine grinding and smoothing. Once the rough grinding has been completed the mirror, tool, work plate etc. should be thoroughly scrubbed and cleaned using soap ...
>ATM Resources – Astro Khan Telpe Making
Khan Research Considering the difficulty of getting mirror-making supplies and other items in India, I decided to start my venture to provide mirror-making kits, glass blanks, abrasives and other supplies. ... They usually stock emery for rough grinding and M301, M302 and M303 for fine grinding. You can also get polishing power red oxide (rouge ...
>Mirror-o-Matic mirror making machine - ATM pages of ...
Mirror-O-Matic grinding machine. When I decided in 2009 after a ten-year break to get into mirror making again, it quickly became clear to me that I would need to construct machine, as hand grinding big mirrors is not something very beneficial for the hands of a musician.
>Fine Grinding a 10" F2 Telpe Mirror by Hand - YouTube
Showing grinding work on a super-fast 10" F2 telpe mirror. Gordon shows fine grinding by hand using the powered turntable.
>Joy of Mirror Making - BBAstroDesigns
The Joy of Mirror Making Mel Bartels. Introduction Rough Grinding Fine Grinding Polishing
>Joy of Mirror Making: Fine Grinding - BBAstroDesigns
The goals of fine grinding are to prepare the curved mirror face so that it is ready for polishing and figuring and make any adjustments of the focal length. Previously in rough grinding we deepened the center of the mirror's face either by …
>How to hold convex mirror blank for grinding? - Page 2 ...
Page 2 of 2 - How to hold convex mirror blank for grinding? - posted in ATM, Optics and DIY Forum: Considering I dont have another glass blank for a 6 tool, would you suggest just making a flat tile tool and skip the hogging step on my 6 mirror? I feel like the 10 mirror might just be an opportunity to mess with the grinding process and gain some more …
>Newport Glass Works, LTD. Grinding, Polishing and Figuring ...
Leaving the mirror grossly hyperbolic will make fine grinding difficult. Fine Grinding . We've all heard stories about fine grinding taking hundreds of hours. If done correctly, however, fine grinding takes a fraction of this time, and in fact, is one of the more manageable jobs in …
>Making a Mirror. - Astronomy
There are four major stages in making a mirror: First carve a hole in the mirror to the basic depth that you need. This part is called coarse grinding. Second is to smooth out the pits to the point where the mirror can be polished. This part is fine grinding. Third is …
>Mirror grinding - scope making
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 you grinded with TOT, the edges will be more worn than the center, and vice versa if MOT. This is okay.
>Mirror Grinding Machine | Hackaday
Grinding and polishing your own mirrors is a long, arduous process. Instead of lapping the blank by hand, Laurie Hall built this mirror grinding machine from scratch.
>TELPE MIRROR MAKING HOW TO: Fine Grinding - …
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.
>Joy of Mirror Making: Rough Grinding - BBAstroDesigns
31 Here are 42 inch [107cm] and 30 inch [762cm] mirrors slumped and annealed to F2.8 …
>Grinding a 6 inch Mirror - ATM, Optics and DIY Forum ...
Page 1 of 4 - Grinding a 6 inch Mirror - posted in ATM, Optics and DIY Forum: Hey Everyone, I first made a 6 f/10 telpe back in 2002. It was, as everyone called it here the minimum size you should make. So I went ahead with it. The f/10 was because some gentleman had ground the glass to f/10 and abandoned it in the local astronomy club and the president of …
>Grinding,Polishing and Figuring - Part 2 - Polishing
Fine grinding: I change from my rough grinding area to my fine grinding and polishing area after 220, not before. #220 is still gritty stuff. The "W" stroke: This is a casual way of describing any stroke that goes forward and backward while progressing left …
>Making a 33 cm f/4.8 mirror on the mirror-o-Matic 4: Fine ...
After rough grinding to (about) the right focal length with carborundum 80 (165 micron) and 180 (76 micron) grit, this video is about fine grinding with 25, ...
>Joy of Mirror Making: Polishing - BBAstroDesigns
Press hard and slowly stroke the mirror back and forth with 1/6 overhang on the far edge and the overhang on the near edge: the stroke overall should be about 1/3 the diameter of the mirror. Do not swing the mirror much side by side, sometimes called a 'W' stroke; instead keep the stroke more like "|". Each stroke should take about a second.
>Explore how telpe mirrors are made | Astronomy
Making a telpe mirror. To start, a new mirror blank is "sanded" down to create a precise parabolic curve in a process called grinding. To do that, the blank is paired with a device called ...
>How to Grind a Telpe Mirror in 10 Easy Steps – Starry Nova
In all phases listed, fine grinding is the most manageable task in large mirror making. You can roughly work for about 2 hours on each grading. One of the critical things that makes it easy is the division into two stages: Before #220 and after #220.
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