Hi All, A fellow student at the Workshop Appreciation course is making a tool grinding rig for attachment to a standard grinder, (Harold Hall design). He has been searching for a supplier of stone cup wheels without success, can any one point us in the right direction. He has been advised that the diamond type would not be suitable for sharpening things such as end mills, is this correct? It seems odd to me, particularly as diamond type are becoming more common and cheaper now. Regards Ken Jones in sunny Berkshire MODEL ENGINEERING DISCUSSION LIST. To UNSUBSCRIBE from this list, send a blank email to, modeleng-request@xxxxxxxxxxxxx with the word "unsubscribe" in the subject line.