Telescope mirror blanks are an essential element in the construction of large telescopes. A 20 inch telescope mirror blank is a large, flat, curved piece of material that is used to form the primary and secondary mirrors in a telescope. The blank is typically made from a lightweight and durable material such as aluminum, glass, or carbon fiber.
The size of the blank is determined by the telescope’s aperture, which is the diameter of the light aperture. A 20 inch aperture requires a 20 inch mirror blank. The blank must be machined to the exact specifications of the telescope, which will depend on the design of the telescope and the desired results.
The blank must also be machined to a very high tolerance, as even small variations in the blank can affect the performance of the telescope. To ensure the highest quality standards, the mirror blank should be inspected and tested to ensure the accuracy of the mirror blank’s surface.
Step-by-Step Guide To Creating a 20 Inch Telescope Mirror Blank
- Choose the material for the mirror blank. Aluminum, glass, and carbon fiber are all popular materials for telescope mirror blanks.
- Calculate the dimensions of the mirror blank, based on the telescope’s aperture size.
- Cut the blank to the desired shape and size.
- Polish the surface of the mirror blank to a high tolerance.
- Apply a coating to the mirror blank to protect it from the elements.
- Test and inspect the mirror blank to ensure the accuracy of the surface.
The accuracy of the mirror blank is critical to the performance and accuracy of the telescope. The mirror blank must be machined to very tight tolerances and must be inspected to ensure that the surface is smooth and uniform. Any imperfections, such as scratches or bubbles, can cause distortion in the image produced by the telescope.
The materials used to construct the mirror blank must also be chosen carefully. The material must be lightweight and durable, as the telescope must be able to withstand the forces of gravity and other external forces. Additionally, the material must be able to withstand extreme temperatures and must be able to maintain its shape and accuracy over time.
Creating a 20 inch telescope mirror blank is a complex process that requires precision and accuracy. The blank must be machined to exact specifications and must be inspected to ensure the accuracy of the surface. The materials used must be chosen carefully and must be able to withstand the forces of gravity and other external forces. Careful attention must be paid to the process of creating the mirror blank to ensure that the finished product is of the highest quality.
Cutting telescope mirror blanks out of a thick glass tabletop
In this video I cut seven telescope mirror blanks of various different diameters out of a thick glass tabletop. I used my Makita glass saw to cut wedges out of the round tabletop, then turned the wedge shaped pieces round on my Rigid wet saw. please visit mdpub.com/scopeworks/ for more information. Makita CC02R1 12V MAX CXT Lithium-Ion Cordless Tile/Glass Saw Kit amzn.to/3f6gvbh
Main Mirror Diameter 200mm (8") Focal Length = 1000mm Height of Focuser = 70mm Outside Diameter of Tube = 230mm divided by 2 (half) = 115mm Total distance from. , 20 Inch Telescope Mirror Blank.