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25-11-2011, 06:26 PM
Hi all, is it possible to source glass of decent quality thicker than 19mm(3/4") float for mirror making anywhere in Oz/NZ? It seems that one is caught between a rock and a hard place with 19mm float being of a reasonable price,but too thin for a serious big mirror project (30"+),and the high prices elsewhere (China,USA) for 1.5"-2" thickness substrate. Any help appreciated.:shrug::help::question:
28-11-2011, 08:05 PM
You could try and find someone with a large kiln to slump 2 thicknesses of 19mm together.
29-11-2011, 03:47 PM
Hi Chris, thanks,I had thought of that option,but not sure if I would end up with an end product that would be free of strain etc. At this point in time I have ground out a number of mirrors in 19mm float. 18.5", 20.25", 22", 22.15", 25". The last three are polished out,each with a focal length of 117.5".The last two I am currently figuring.I have the 22.15" at around 1/2 wave PV at the moment (aiming for 1/4 wave on its first working), the 25" is more stubborn at worse than a two wave error. For a serious project I need more thickness,but at an affordable price,but yes, your suggestion is worthy of further investigation.
Anyone out there with further thoughts or suggestions? Your imput would be much appreciated.:hi::hi::hi:
07-12-2011, 08:49 AM
Have a look at my post here.
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