PRECISION GROUND TOOLROOM STONES

I describe/show where and how to use precision ground flat stones. Why these are an absolute must for working with high precision tooling. What makes them work and how to make your own your own set. Paypal donation https://www.paypal.com/cgi-bin/webscr?cmd=_s-xclick&hosted_button_id=W64WRAAGMA79J&source=url Support through Patreon https://www.patreon.com/ROBRENZ I am "robinrenzetti" Instagram lots more content there! Two of the papers I mentioned https://static1.squarespace.com/static/5b904ddc620b85136aab54a4/t/5c92e62215fcc0f041193638/1553131042995/flatstones.pdf http://www.sciencedirect.com/science/article/pii/S0141635997000123