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Rough grinding complete.
12hours, about 140 wets. about 20 wets per mm of sagitta.
at 365mm F3.3 shape. 1200mm focal length.
It's been a good learning experience. Although it has taken longer than it could have with other methods, I now have a very smooth curve that is looking really good with fine grinding. Past 120 and finishing up 220 now. Discovering how hard it is to gauge what tiny pits are from what grit.
Sure I will learn.
Thanks for the 3rd piece of glass Stephen. Will have to work out what I do with it.
I have decided the next project will be grinding the other side of my tool into a constant thickness 10 or 12 inch mirror. It will be quite thin. Maybe 20mm.
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