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You ought to do this indoors in a dust-controlled area. if your mirror gets scratches on it, you'll know it's because it got contaminated by airborne grit and stuff! I had blisters for weeks after \i made my 6" mirror in the 1960s.
Still have the polished blank somewhere! Good Luck.Enjoy your scope and its making.
MC
MiCompre 8 months ago
Very nice pyrex disc, Im sure you put it to a nice shape.
balzerbarn 1 year ago
@balzerbarn Thank you! Slowly getting there. Just got finished with grinding.
iutubeus 6 months ago
Thats one thick mirror, i use 19mm glass for anything up to 16 inch
zi6film 2 years ago
@zi6film You mut be in Europe. In the States we have substrates available to 1:6 thickness to diameter. It makes fo a more stable mirror and reduces mounting problems.
foreilly1958 9 months ago
@zi6film You are saying my blank can be half as thick. Interestingly, according to an old classic -- "How to Make a Telescope" by Jean Texereau -- my blank should be twice as thick! (3 inches for a 12.5-inch mirror.) So I thought I was taking the middle road. :-)
iutubeus 6 months ago
cool.. i just cleaned my telescope mirror for the first time today.. I love taking the telescope apart so see all its working parts! How long does it usually take to finish a mirror that size?
jamieball 2 years ago
@jamieball about 40 hours by hand to grind and polish a 12 inch mirror
zi6film 2 years ago
Interesting, I hope one day to grind my own mirror.. it must be satisfying to achieve good viewing with a telescope mirror that you grinded yourself..
jamieball 2 years ago
@jamieball Must be. (I am still getting there myself.) What is neat is that -- given enough patience -- the result you can achieve by hand will be as good as any mirror you can buy.
iutubeus 6 months ago
Nice, make sure you rotate your tool!
Messiermarathon 2 years ago
just moving it back and forth will give it the shape?
covalentbond007 2 years ago
Moving it back and forth while rotating frequently will make it spherical (surface of least friction). To make it ultimately parabolic - which is the shape one wants for a Newtonian telescope - one eventually switches different and more subtle strokes.
iutubeus 2 years ago
@iutubeus How did your mirror come out?
foreilly1958 9 months ago