Tony,
I have been using the wheel that has been on this machine since I purchased it. I am pretty confident it is a resin bound diamond wheel. The information on the wheel is:
New Hermes
30-273-00
In the New Hermes Engraving Machine Accessories catalog I have, the resin bound diamond wheel is 30-273-01. This is the closest match in this catalog.
I called New Hermes, one of the largest engraving machine suppliers in the United States, to get further information for you. According to the customer service rep, there is only one person who "might" know what this grinding wheel is, in spite of the fact that I provided him their product code. This person was out of the office and would have to call me back.
I am holding out hope that the new owner of Gravograph - New Hermes sees value in a complete overhaul of the customer service structure of this company. Great products - Sad, Sad service.
Sorry for the rant.
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