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Author: Subject: Question for a machinist
gnitseretni
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[*] posted on 7-3-2012 at 19:42


Crap, I meant 9 inches square (9X9). Sorry, everybody! :(
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Rosco Bodine
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[*] posted on 7-3-2012 at 21:14


I mentioned lexan sheet which may be flat enough as is, but since it is
flexible, you could use shims or adjustment screws bearing upon the underside of the lexan for curvature correcting any bow, if it was secured to a rigid backing plate by its corners. A mounting frame with a "stadia" wire used as a straightedge
could be used as a Glint indicator where you could see daylight reflection under the wire as you visually check the surface flatness crossways in something like an asterisk pattern, gauging the surface with the taught wire.
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gnitseretni
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[*] posted on 8-3-2012 at 03:54


Lexan wouldn't work. The bed is heated from underneath with resistors, to about 70C. The bed is heated so the printed part doesn't warp. It needs to cool off slowly.
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dann2
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[*] posted on 8-3-2012 at 06:24



A book, Amateur Telescope making my Albert G. Ingalls, describes making optical flats from glass and metal. These thing can be made to millionths of an inch using elbow grease and time.
Will post some photo of pages if you want.
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gnitseretni
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[*] posted on 8-3-2012 at 16:11


Nah, I think I'll just get that plate from McMaster that I mentioned in my first post.
Thanks though.
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