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Probably meehanite cast iron rather than steel. Yep - looks like a long-radius grinder for CX surfaces. Did you put a spherometer on it yet?

If you don't have a spherometer, an old trick Joe Appels showed me was to clean off your grinder, then spray WD-40 on it and get the sun's image in focus and measure the distance to focus. Not as accurate as a well-made and calibrated spherometer but better than trying to stack up valve shims under a straightedge.

Mike

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Hey Mike...It is made from cast iron..I also have another tool that is very similar but is flat and it has concentric rings cut into the surface. It to has the large taper pin on its bottom. What is this tool used for? Picture included.

Lastly my original question...if this concaved tool is just that..a tool used to grind in convexed surfaces on lenses/mirrors...how is it actually used on the machine?

My guess is it sits on the glass and is stroked by way of a poker pin with a ball tip in the recess in the tapered pin of the tool.

Rob

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