mirror grinding paraboloid

Parabolic Mirror Grinding Machines Products

2021-3-27  Some methods for the fabrication of large diameter off-axis paraboloids. According to directions (a mirror so marked by axis) and tilt, the sub- parabolic mirror is plastered on the grinding machine spindle. Testing technology for off-axis parabolic mirror during fine grinding stage.

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New Fabrication Process of Deep Paraboloidal Mirror

In this paper, ELID grinding and electro-forming techniques were applied to fabricate a deep concave paraboloidal mirror which will be used in Laman spectroscopy instrument. First, an injection mold with paraboloid was fabricated by ELID grinding and polishing.

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OSA Stressed mirror polishing. 2: Fabrication of an

A mirror has been fabricated with the shape of an off-axis section of a paraboloid by grinding and polishing a sphere into a prestressed blank. The applied stresses were then removed allowing the mirror to spring into the desired paraboloidal shape. The 36-cm diam off-axis section deviated 9.9-μm rms from the polished sphere.

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mirror grinding parabolic in slovakia

2021-3-19  Grinding own mirror gives you a spherical or a parabolic. Aug 27 2012 The natural mirror grinding process will create a sphere The first part of making a mirror is to grind and polish to a sphere of the required focal length Then the mirror is parabolised by using special polishing strokes that changes the figure from sphere to paraboloid

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- WOS - Wenk Observatory Solutions

2020-7-24  Parabolising is then nothing else as retouching the mirror again and again until the measured ROCs coincide with the caculated ones. Note: Up till now, the zone masks (zone screens resp.) have always been physical screens placed in front of the mirror which caused some serious problems such as diffraction phenomena, paralaxes etc.

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Grinding own mirror gives you a spherical or a

2012-8-27  The natural mirror grinding process will create a sphere. The first part of making a mirror is to grind and polish to a sphere of the required focal length. Then the mirror is parabolised, by using special polishing strokes, that changes the figure from sphere to paraboloid.

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A method for manufacturing parabolic mirrors -

The possibility of producing a thin mirror by pouring resin onto a spinning pan of mercury was also invest- igated. A primary form was first cast from plastic to minimize the amount of mercury required to cover the surface, and then liquid resin was added and allowed to set. This produced a thin-walled paraboloid with a mirror surface on both sides.

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Joy of Mirror Making: Rough Grinding - BBAstroDesigns

31 行  2020-5-19  But the shape that will focus light coming from distant astronomical objects to a

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Flexing Spheres into High-Quality Telescope Mirrors

2020-1-14  required paraboloidal mirror. Genera-tions of amateur telescope makers have been taught to proceed by first grinding and polishing a smooth sphere, and then to modify the sphere into a paraboloid. And therein lies the difficulty. While a spherical surface will arise somewhat naturally from normal grinding and pol-ishing action, a parabolic one will not.

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optics - Is it practical to hand grind a convex parabolic ...

2021-4-5  I know it's practical to hand grind a convex spherical mirror and that it's practical to make a concave parabolic mirror from a spherical one. But as I understand it, the procedure for doing so depend on tracking progress by using interference patters generated by focusing light off the mirror, and that procedure clearly can't be used (unmodified) with a convex mirror.

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Stressed mirror polishing. 2: Fabrication of an off-axis ...

1980-7-15  A mirror has been fabricated with the shape of an off-axis section of a paraboloid by grinding and polishing a sphere into a prestressed blank. The applied stresses were then removed allowing the mirror to spring into the desired paraboloidal shape. The 36-cm diam off-axis section deviated 9.9-microm rms from the polished sphere.

More

optics - Is it practical to hand grind a convex parabolic ...

2021-4-5  Apparently there is a way of testing a convex mirror by making it from optical grade glass and testing it through the back. The refractive part of the light path creates a situation that if you test it as a sphere or paraboloid in that way (I forget which) the actual curve you get is a hyperboloid.

More

A method for manufacturing parabolic mirrors -

The possibility of producing a thin mirror by pouring resin onto a spinning pan of mercury was also invest- igated. A primary form was first cast from plastic to minimize the amount of mercury required to cover the surface, and then liquid resin was added and allowed to set. This produced a thin-walled paraboloid with a mirror surface on both ...

More

Grinding own mirror gives you a spherical or a

2012-8-27  The natural mirror grinding process will create a sphere. The first part of making a mirror is to grind and polish to a sphere of the required focal length. Then the mirror is parabolised, by using special polishing strokes, that changes the figure from sphere to paraboloid.

More

mirror grinding parabolic in slovakia

2021-3-19  Grinding own mirror gives you a spherical or a parabolic. Aug 27 2012 The natural mirror grinding process will create a sphere The first part of making a mirror is to grind and polish to a sphere of the required focal length Then the mirror is parabolised by using special polishing strokes that changes the figure from sphere to paraboloid

More

OSA Stressed mirror polishing. 2: Fabrication of an

A mirror has been fabricated with the shape of an off-axis section of a paraboloid by grinding and polishing a sphere into a prestressed blank. The applied stresses were then removed allowing the mirror to spring into the desired paraboloidal shape. The 36-cm diam off-axis section deviated 9.9-μm rms from the polished sphere. The final surface deviated 0.03-μm rms from the desired off-axis ...

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- WOS - Wenk Observatory Solutions

2020-7-24  After fine grinding, the mirror has to be polished. The tool - made from plaster - is the same as used for fine grinding but now carries a special polishing layer. ... As a last step it is necessary to change this spheroid to a paraboloid - only then a 'Newton' delivers really optimal results!

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How to convert a spherical mirror to a paraboloid mirror

The second, an 8- inch f/6.1, was the first mirror I ever ground — a good smooth surface, spher- ical to within about 1 ⁄22 wave. It tests out as 1 ⁄40 wave when flexed into a paraboloid. This mirror is now installed in my equa- torially mounted scope and shows per- fect star images at 500× to 700×.

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Joy of Mirror Making: Rough Grinding - BBAstroDesigns

2020-5-19  Rough Grinding The first milestone is putting a curve into the mirror face. The curve's depth dictates the mirror's focal length. The curve should be spherical. Creating the curve can be done by several methods: The curve is ground into the mirror face using a grinding tool. The curve is pre-generated for you.

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Making mirrors for giant telescopes - SPIE Digital Library

The next 72 inch mirror was cast in a spinning furnace whose 16 rpm rotation gave an f/1 surface. When eventually scaled up to the 8.4 m f/1.14 LBT primary mirrors, spin-casting would save 28 tons of expensive glass—more than the mass of the finished mirror—and would greatly reduce the annealing time and grinding time.

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Grinding/polishing/figuring machine for large mirrors

The convenient milliarcsecond x-ray optic is a paraboloid mirror with a graze angle close to half degree and with 0.1 arc sec tolerance. For a reasonable plate scale, the cross sectional radius of the paraboloid should be about 5 - 10 meters.

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mirror grinding parabolic in slovakia

2021-3-19  Grinding own mirror gives you a spherical or a parabolic. Aug 27 2012 The natural mirror grinding process will create a sphere The first part of making a mirror is to grind and polish to a sphere of the required focal length Then the mirror is parabolised by using special polishing strokes that changes the figure from sphere to paraboloid

More

optics - Is it practical to hand grind a convex parabolic ...

2021-4-5  Apparently there is a way of testing a convex mirror by making it from optical grade glass and testing it through the back. The refractive part of the light path creates a situation that if you test it as a sphere or paraboloid in that way (I forget which) the actual curve you get is a hyperboloid.

More

- WOS - Wenk Observatory Solutions

2020-7-24  After fine grinding, the mirror has to be polished. The tool - made from plaster - is the same as used for fine grinding but now carries a special polishing layer. ... As a last step it is necessary to change this spheroid to a paraboloid - only then a 'Newton' delivers really optimal results!

More

Wonderings On Spin Casting Parabolic Mirrors,

I'm talking multiple primaries, not folded scopes. I KNOW that mirror focal lengths must be matched, and there are BIG collimation headaches, and that mirrors off axis have coma probs (Long focal length may not be so bad), but I can get 4 or 5 finished 6" mirrors for less than a 12" mirror grinding kit.

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Joy of Mirror Making: Rough Grinding - BBAstroDesigns

2020-5-19  Rough Grinding The first milestone is putting a curve into the mirror face. The curve's depth dictates the mirror's focal length. The curve should be spherical. Creating the curve can be done by several methods: The curve is ground into the mirror face using a grinding tool. The curve is pre-generated for you.

More

Some methods for the fabrication of large diameter

Off-axis paraboloid is commonly used in optical systems and collimator, its greatest advantage is that no central shelter. Difficulties of manufacture depend on the processing precision of mirror, focal length, aperture size and off-axis. As an asymmetry surface, it is really a hard work to manufacture a surface with an amount of large off-axis, large-diameter, large volume of non-sphere. Here ...

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Hyperbolic / Parabolic mirror question - ATM, Optics

2004-10-15  Page 1 of 3 - Hyperbolic / Parabolic mirror question - posted in ATM, Optics and DIY Forum: OK, SO I know that all standard newt mirrors are parabolic, which will be defined as y = z(x^2) and have a focal point, yadda yadda... I understand parabolic just fine, I like the math, Im happy But I know some mirros are HYPERbolic, y= z/x. The Epsilons are an example.

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Making your own telescope mirror -

The paraboloid shape is needed to give crisp images even at the center of the field; otherwise light from all parts of the mirror doesn't come to a focus at the same location even for a single star at the center (the technical term for this is spherical aberration, which many people will shudder at the memory of from the early days of Hubble).

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aluminium telescope mirror - Beginners Forum (No ...

2007-8-3  aluminium telescope mirror - posted in Beginners Forum (No astrophotography): In amateur telescope making, telescope mirrors, as I understand the process, are made by rubbing two vertically stacked disks of glass against one another until the lower disk has the desired concave shape. The mirror is then polished smooth and coated, by some chemical process, with a thin layer of aluminium or ...

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