grinding mirrors

Mirror grinding - scope making

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 (visible at ...

Joy of Mirror Making: Rough Grinding - BBAstroDesigns

31 行  Grinding the curve into the mirror face can be done by one of the following approaches:

Stellafane ATM Main Page

Newport Glass Works, LTD. Grinding, Polishing and Figuring ...

Placing the mirror face up and grinding with a moderate "W" stroke will also move the curve toward the edge, and tends to produce a more spherical surface. Leaving the mirror grossly hyperbolic will make fine grinding difficult. Fine Grinding . We've all heard stories about fine grinding taking hundreds of

Grinding a 25-Inch F3 Telescope Mirror: Thinning and ...

Dec 16, 2014  Gordon started with a 2" thick telescope 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 ...

A new grinding method for aspheric ceramic mirrors ...

3. AEGM for axisetric aspheric mirror In conventional methods of grinding an axisymmetric aspheric mirror, the wheel axis is fixed in a perpendicular position relative to the workpiece axis"'. The grinding path, OA, is a plane curve parallel to the xz-plane, as shown in Fig. 2(a). Only one part of the wheel (point PA) is used in this grinding ...

Joy of Mirror Making: Polishing - BBAstroDesigns

Then after grinding the mirror face with 220 grit, cleanup thoroughly and flash polish by polishing for 15 minutes. Don't go onto finer grits until the astigmatism is gone. The second is to identify the saddle orientation, and using a sub-diameter lap, locally polish the ends of the saddle.

Build your own telescope 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). Plop is a useful software to let you calculate the number of points needed based on the diameter and thickness of the glass:

Telescope Making Supplies

Throughout the grinding and final lapping stages, the objective has been to reduce pits and scratches to the smallest possible size. However, no amount of grinding can produce a surface smooth enough or sufficiently transparent to meet the needs of a first-class telescope objective. Different techniques are

Grinding a 25-Inch F3 Telescope Mirror: Thinning and ...

Dec 16, 2014  Gordon started with a 2" thick telescope 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 ...

Mirror Grinding Machine

My Mirror Grinding Machine. 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, pulleys, etc.

A new grinding method for aspheric ceramic mirrors ...

3. AEGM for axisetric aspheric mirror In conventional methods of grinding an axisymmetric aspheric mirror, the wheel axis is fixed in a perpendicular position relative to the workpiece axis"'. The grinding path, OA, is a plane curve parallel to the xz-plane, as shown in Fig. 2(a). Only one part of the wheel (point PA) is used in this grinding ...

Ed Grinds a Mirror

Mirror grinding is a noisy, messy, wet activity. It doesn't take up enough of your attention to fully occupy you, but it does take up just enough that you cannot do something else like watch TV, listen to the radio, etc. You're pretty much stuck there looking at your hands, and adding water or grit once in a while. ...

(PDF) Grinding of aspherical SiC mirrors - ResearchGate

The mirror freeform grinding may be parameterized by material behavior, tool size and posture, grinding conditions and abrasive tool performance. On the base of virtual ball-end algorithm, the ...

Amazon: glass grinding wheel

3 Inch 150 Grit Flat Diamond Grinding Wheel Cutter Grinder Power Tool with 1/2" Bore for Grinding Hard Alloy, Glass, Tiles and Ceramics 78x12.7x10mm. 4.4 out of 5 stars 34. $19.99 $ 19. 99 $21.98 $21.98. 6% coupon applied at checkout Save 6% with coupon. Get it as soon as Tue, Jun 30.

King Telescopes, telescope mirror blanks, using both ...

Our intent is to provide a source for lower cost, mirror blanks, and supplies for grinding your own telescope mirror. If I had known as a kid how, well not easy, but indeed not as hard as I would have expected to grind my own mirror. I sure would have had a much nicer scope then. At present we have a supply of high quality Pyrex mirror blanks.

Swayze Optical! - Home Page

Grinding and polishing the mirror is the most difficult part of making a telescope. 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.

Telescope Mirror Blanks / TelescopeMirrorBlanks.Com ...

* Thin plate glass mirror blanks are lighter than standard mirror blanks, which allows you more flexibility in designing your telescope tube assembly and mount. * When grinding a telescope 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 Telescope Mirror Blanks

Telescope Making Supplies

Throughout the grinding and final lapping stages, the objective has been to reduce pits and scratches to the smallest possible size. However, no amount of grinding can produce a surface smooth enough or sufficiently transparent to meet the needs of a first-class telescope objective. Different techniques are

Obsession Telescopes / Optics

About our mirror suppliers. Obsession Telescopes feature primary mirrors made by two of the best established and most reputable optical companies serving the astronomy community today. Optical Mechanics Inc. (OMI) supplies Obsession with 12.5" to 25" aperture mirrors. Ostahowski Optics supplies Obsession with 15" to 22" aperture mirrors.

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.

tut44 Making A Mirror Grinding Tool - Asterism.org

After fine grinding is complete, the mirror must be polished. It is during polishing that you “figure” the mirror by using a different polishing stroke to change the mirror’s spherical polished shape into a parabolic polished shape . See a related tutorial nearby titled, “ Making A Mirror

Precision Diamond Machining SPDT Precision Mirrors

The precision mirrors we produce come in a variety of configurations ranging from large area planar mirrors for beam steering and positioning systems to multi-faceted spin mirrors for defense and aerospace applications.

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 to right or right to left on the mirror.

Amazon: MIRRORCC Frameless Wall Mirror Full Length ...

This MIRRORCC Round Corner Frameless Bevel Grinding Edge Wall Mirror aims to offer mirrors in a simpler and more textured way. Three-dimensional bevel grinding edge, European modern style, elegant and warm; Finely edging, beautiful lines, smooth and transparent, beautiful, noble, elegant and graceful, sleek modern styling.

ELID grinding of SiC ultra lightweight mirror

ELID grinding of sintered SiC mirror is successfully carried out using ultra-precision rotary grinder, and high surface quality was obtained. But, Due to the very thin mirror, profile deformation occurred. 2. The numerical calculation results by FEM agree with the results by ELID grinding experiment. 3.

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.

jeffbaldwin.org

Fixed-post machine grinding is where the mirror is on a turntable rotating around 20 PRM [speeds vary], and a 75% tool is on top. They are already curve-generated. The tool is hanging over the mirror by 1/6 the diameter of the tool, or about 1/8 diameter of the mirror, and is fixed in this position.

Telescope Mirror Blanks / TelescopeMirrorBlanks.Com ...

* Thin plate glass mirror blanks are lighter than standard mirror blanks, which allows you more flexibility in designing your telescope tube assembly and mount. * When grinding a telescope 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 Telescope Mirror Blanks

10Inch Ritchey Chretien Cassegrain ATM Project

Grinding started with 220 grit and in less than 1 hour full contact was established between the mirror and all the grinding tiles. Grinding of the secondary mirrors stared at 80grit even before the primary was joining in. As the secondary diameter is about 4inch the required radius was reached in 30minutes.

Telescope Mirrors Prisms for sale In Stock eBay

The aperture of a telescope is the size of the primary mirror. The aperture can be measured in either inches or mm. A 10-inch telescope mirror has a 10-inch or 250mm primary mirror. You can collect more light with a larger aperture. A 20-inch telescope mirror for sale will collect 6.25 times more light than an 8-inch telescope mirror will.

King Telescopes, telescope mirror blanks, using both ...

Our intent is to provide a source for lower cost, mirror blanks, and supplies for grinding your own telescope mirror. If I had known as a kid how, well not easy, but indeed not as hard as I would have expected to grind my own mirror. I sure would have had a much nicer scope then. At present we have a supply of high quality Pyrex mirror blanks.

Mike's Telescope Workshop - Mike's World.

This is my home-built edge grinding machine for grinding down my home-cast mirror blanks. Click to see the whole project. This is a 12.5 inch diameter, 1.5 inch thick, light-weight honeycomb-back telescope mirror blank that I made myself. The blank only weighs 10 lbs, 4 oz. I am very excited about this process.

Telescope Mirror Making

For grinding the back of my 12" mirror, I used an 8" disk of 3/4" particle board, glued tiles to the front with epoxy, and coated the back and sides with polyurethane. It worked great. I made my polishing tool for my 12" mirror out of three layers of 3/4" particle board glued together.

Telescope Making - Wikibooks, open books for an open world

We make that curve by grinding the mirror. The amount of grinding and the depth of the curve are both directly affected by the choices made while thinking about the telescope. It is the front surface of the mirror that forms the image, so it is the front surface that gets all of our attention. The back of the mirror may get quite beat up during ...

How I make Telescope Mirror Blanks

Here is a stack of my home-made 8 and 10 inch mirror blanks. The second from the bottom is the one above. I can use the thinner blank below it as the grinding tool. UPDATE I have started rough grinding one of my home-made 10in glass blanks. Here is an action shot of me, pushin' glass. I am aiming for an f/5 mirror.

Grinding of aspherical SiC mirrors - ScienceDirect

Automatic grinding of toroidal mirrors was tried [3]. The principle of the method is to shape a toroid-shaped (barrel-shaped) grinding wheel and control the relative position of the workpiece and the grinding wheel in the grinding process. Two kinds of grinding operations are possible. One is the plunge grinding operation, in which there is no ...