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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" mirrorIt 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 at31 行· Grinding the curve into the mirror face can be done by one of the following approaches:Joy of Mirror Making: Rough Grinding BBAstroDesigns

Joy of Mirror Making: Fine Grinding

For large thin mirrors, say 12 inches [30cm] or greater and 15 inches [4cm] or thinner, the mirror back must be ground flat, or at least regular in shape before beginning fine grinding the mirror's face Cast a tool specifically for the mirror's back, and grind with 220 grit, inspecting for low unground spots Grind until they disappearPlacing 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 ofNewport Glass Works, LTD Grinding, Polishing and Figuring

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 MoM designs finally inspired me to just get up and do it Over the years, I'd been collecting motors, gear boxes, pulleys, etc Most of them came from industrial junk yardsGrinding Machine for Large Telescope Mirrors I designed and built a grinding machine for mirrors up to 42 inches [11m] in diameter By slipping on and off a couple of belts, the machine can quickly be reconfigured for spinning work or for stroking work The machine can also work smaller mirrors if the drip pan is moved to the fast shaft onGrinding Machine for Large Telescope Mirrors

Preparing to Grind a 22" f/40 Telescope Mirror

Feb 10, 2014· This video shows preparations for grinding a 22" f/40 telescope mirror This is the first mirror of a pair that will become a 22" binocular scope! Gordon Waite shows how to evaluation theThen 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 subdiameter lap, locally polish the ends of the saddleJoy of Mirror Making: Polishing BBAstroDesigns

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:May 11, 2017· Page 1 of 2 Mirror Grinding Take A Class Or DIY? posted in ATM, Optics and DIY Forum: Ive been interested in grinding/polishing my own Newt mirror for a long time but dont know how to get started As a beginner, would you recommend attending a workshop or class or is it possible to make a good mirror using other learning resources such as books and online videos?Mirror Grinding Take A Class Or DIY? ATM, Optics and

Mirror grinding safety ATM, Optics and DIY Forum

Feb 14, 2012· Mirror grinding safety posted in ATM, Optics and DIY Forum: When grinding mirrors ATMs use grit sizes as small as 9, 5, 3 or sometimes even 1 micron I am not yet at such small sizes and do not yet have to mix grit and water in a bottle to pour drops of it onto the mirror I wear a dust mask to be sure not to breathe in any grinding dust as I have read in a book that someone had to see aA typical grit sequence for an 8" mirror that did rough grinding with #60 grit would be: Silicone Carbide: #80, #120, #220 Aluminum Oxide: 32, 20, 12, 5 micron Often, #320 Silicon Carbide is used instead of 32 micron Aluminum Oxide, and #500 is used instead of 20 micron; any ofStellafane ATM: Fine Grinding

tut44 Making A Mirror Grinding Tool Asterism

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 MirrorMirrorOMatic grinding machine When I decided in 2009 after a tenyear 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 musicianMirroroMatic mirror making machine ATM pages of

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 78x127x10mm 42 out of 5 stars 36 $2198 $ 21 98Fine 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 mirrorGrinding,Polishing and Figuring Part 2 Polishing

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 multifaceted spin mirrors for defense and aerospace applicationsThroughout 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 firstclass telescope objective Different techniques areTelescope Making Supplies

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 125" to 25" aperture mirrors Ostahowski Optics supplies Obsession with 15" to 22" aperture mirrorsDec 01, 1996· 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 xzplane, as shown in Fig 2(a) Only one part of the wheel (point PA) is used in this grindingA new grinding method for aspheric ceramic mirrors

Telescope Mirror Blanks /

* 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 BlanksGrinding and polishing the mirror is the most difficult part of making a telescope And the most critical Mirrormaking 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 bigSwayze Optical! Home Page

| Newbie question: polsim and

Apr 25, 2020· The end result was a cracked mirror from the mirror sticking to the tool during fine grinding and driving it loose with a 4 X 4 The crack was around an 1" deep into the pyrex I tried to finish the mirror but ended up with a severely turned edge due to not channeling the toolFine 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 mirrorGrinding,Polishing and Figuring Part 2 Polishing

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 whileDec 01, 1996· 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 xzplane, as shown in Fig 2(a) Only one part of the wheel (point PA) is used in this grindingA new grinding method for aspheric ceramic mirrors

| Newbie question: polsim and

Apr 25, 2020· The end result was a cracked mirror from the mirror sticking to the tool during fine grinding and driving it loose with a 4 X 4 The crack was around an 1" deep into the pyrex I tried to finish the mirror but ended up with a severely turned edge due to not channeling the toolWhen grinding thin mirror blanks, be conscious of downward pressure, which if excessive, may bend the mirror blank momentarily out of shape While this is not a problem during rough grinding (as the amount of flex is exceedingly small) the effect becomes important as you reach the later stages of making your telescope mirrorThin Telescope Mirror Grinding Advice

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 multifaceted spin mirrors for defense and aerospace applicationsELID grinding of sintered SiC mirror is successfully carried out using ultraprecision 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 3ELID grinding of SiC ultra lightweight mirror

Telescope Mirror Blanks /

* 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 BlanksOne machine is designed for grinding concave mirrors of small focal length The other machine, a much larger piece to implement, grinds mirrors of large focal lengths Though Leonardo da Vinci creates sketches of mirror grinding, one crucial and logical question to ask is whether he used such mirrors in his artwork or drawingLeonardo Da Vinci's mirror making machines

Casting a Large, LightWeight Telescope Mirror From

Photo #2 shows the mirror at the end of rough grinding I was aiming for an f/45 mirror, so the required depth of the curve is 0175 inch Once the required depth is reached, the rough grinding is complete Amazingly, the rough grinding has removed over a pound of glass The mirror now weighs in at only only 8 pounds 15 ouncesNov 04, 2017· The fourth mirror of the Giant Magellan Telescope slowly rotating during preparation for fine grinding at the Richard F Caris Mirror Lab at the University of Arizona on Nov 3, 2017Photos: Mirrors for Giant Magellan Telescope at UA mirror

Angle Grinder Disc In Power Grinding Wheels & Accessories

Angle Grinder Grinding Disc Coarse Glass Diamond Coated 4 Inches Cutting Tool $689 Free shipping Make Offer Angle Grinder Grinding Disc Coarse Glass Diamond Coated 4 Inches Cutting Tool Electric Drill Adaptor Rod Wrench Angle Grinder For Grinder Cut Off Wheels Disc $1309Automatic grinding of toroidal mirrors was tried [3] The principle of the method is to shape a toroidshaped (barrelshaped) 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 noGrinding of aspherical SiC mirrors ScienceDirect

AGI Products: Telescope Mirror Blanks

If one of our standard telescope mirror blanks isn’t exactly what you’re looking for, Advanced Glass can custom make a telescope mirror blank to your specifications AGI can manufacture mirror blanks up

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