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Nov 06, 2013· Page 1 of 2 24 F/6 thin telpe mirror grinding 3/4 plate posted in ATM, Optics and DIY Forum: A friend and I have decided to grind this as a fun yet challenging project. I have ground and polished several mirrors including a 6,,, and quartz mirror. I have decided to take the next step with this ultrathin setup. I know it is bordering on the edge of extremely thin with a 32 ...
Mar 11, 2010· 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 to change from 5micron to 3micron ...
Can You Do It? Make your own telpe mirror, that is? by Doug Scobel Printed in Reflections: June, 2003.. Make your own Newtonian telpe mirror that is? Most people think it is such a daunting task that they never even consider it.
* When grinding a telpe mirror, you will find that plate glass takes less time to grind and polish than a mirror made from borosilicate glass. Please see the Buy Telpe Mirror Blanks page for low prices on plate glass mirror blanks.
Well, that depends. Mostly on the mirror size you wish to grind, and the prices of the local market. In the US, telpe mirrors are the cheapest. A decent 6" (150 mm) mirror can be bought for under 100. In Europe, prices are usually twice, if not three times that.
My Mirror Grinding Machine. For a long time I''ve wanted to build a machine for grinding telpe mirrors. Dennis Rech''s MoM designs finally inspired me to just get up and do it. Over the years, I''d been collecting motors, gear boxes, pulleys, etc.
Grinding the back flat is just the first step in preventing astigmatism. The next step is the proper mirror support. Fine grind and polish the mirror face up. A thin mirror bends over the edge of the tool if it''s worked on top, so the problem reduces to supporting the mirror from its underside.
Sep 29, 2010· Mirror Grinding Machine posted in ATM, Optics and DIY Forum: I have some interest in building a grinding machine for possible up to an 18 mirror, but something that will also do a 6 or 8 mirror. I have plans for the Mir O Matic but would like to do something a bit more modern. I have some ideas about using a AC drive and a large aluminum disk for the turntable and have made a parts list .
Feb 15, 2016· Making a 33 cm f/ mirror on the MirroroMatic 6: polishing the surface with a pitch lap Duration: 9:12. Jan van Gastel 3,159 views
May 30, 2014· This is how you make a telpe mirror out of a hunk of glass: Use a sand mixture and another piece of glass to grind away the middle of a concave shape. Repeat with finer and finer grit sand. Dave Barosso demonstrates the technique, but to do it yourself, try to visit one of the Telpe Makers Workshop''s classes on Friday nights in Oakland.
Dec 16, 2014· Gordon started with a 2" thick telpe mirror that weighed about 70 pounds. By thinning the blank, he''s lightened the mirror by about 20 pounds! This video explains how he ground off the excess ...
Mar 06, 2006· 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
Now that I have several blanks made, it is time to grind and polish one into a telpe mirror and test it out. I can use one blank as the mirror and another as the grinding tool, and have a couple in reserve in case something goes horribly wrong during the grinding and polishing operations. I''ll post an update once a mirror is completed.
Grinding the secondary is just like grinding any other optic except in minature. I ground the secondary with the workstand and worked the tool on top just like I would grind a larger mirror. This optic is small enough that a lens grinding machine could work well.
Jan 26, 2012· Want To Make A Giant Telpe Mirror? Here''s How Astronomers want increasingly large telpes to peer into the depths of space. To build a solid telpe mirror nearly 30 feet across, you need ...
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 " thick. Its what I decided to use to make the mirror. Cutting it into smaller sections can be difficult but scoring it with a glass cutter and tapping t...
Rough grinding. This step is about making one side of the glass concave. It will give your mirror its overall focal ratio. If you make the centre deep, you will end up with a fast telpe ( F/D = 4) well suited for deep sky observations. On the opposite, a shallow mirror ( F/D = 8) will be performing very well on planets and the moon.
US suppliers of Mirror Blanks, Grinding Polishing Supplies, and Telpe Making Supplies. Astronomy Clubs Many can offer help with your project. Astronomy Conventions Star Parties A good place to look at various telpes and chat with their owners. Mirror Making Courses Workshops
Mirror Making Myths. Mirrors can only be made with Special Precision Equipment in Expensive Factories or Labs; Not True! Telpe mirrors can be made in your kitchen, basement or garage with nothing more than the mirror blank and a second piece of glass (called the tool) to rub the mirror against with an abrasive grit and water slurry.
This is the focus of all your work you will turn this flat piece of glass into an accurate parabolic telpe mirror. We recommend a full thickness Pyrex blank for mirrors up to to 12" in size. Fullthickness means the diameter to thickness ratio is 6:1 ( an 8" full thickness mirror is " thick).
The table below can be used as a rough guide in obtaining the grit, polish and pitch necessary for a small mirror project. Be aware that buying small quantities of is often difficult and expensive, and the first time mirror maker usually does best to purchase a mirror making kit which includes the necessary set of abrasives and pitch.
Other Mirror Classes. This page lists mirror making making classes that we are aware of. Just like our Stellafane mirror class, these groups will help you learn how to make a telpe mirror, and provide guidance, instruction, and mentoring to help you with your project, and connect you with knowledgeable ATM''s to answer your questions.
Jan 15, 2016· How to Build an 80FootWide Telpe Mirror to See Deep Space. ... After a pause for work on two other mirrors, the lab is in the process of grinding Segments 2 and 3. Segment 4 has just ...
Feb 19, 2013· How long to grind and polish a 12 mirror ? posted in ATM, Optics and DIY Forum: Hello everyone ....I have a 12 precurved mirror blank. Its an f/5 made of thick plate glass. I also have a matching dental plaster tool with tiles on it. The tool is a bit thick and weighs close to 5 lbs. Its a subdiameter tool thats almost 10 inches in diameter.
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