Thanks Joe. I want to start this weekend by cutting the two pieces of glass that I have. I have one pyrex blank that is 100mm diameter and a plate glass tool that is 150mm diameter. I need both to be 70mm. I'll cut them on saturday and if everything goes well I'll start grinding on sunday. I'll go through the whole process until polishing and then see how I tackle the next step. There are a few options available. I'm trying this out to see if I can make this whole project work. If it does then I'll do the same with the 50cm pyrex blank I have.
Regards Cristian
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