"Hand graving" - a method first suggested in a sales brochure by Lorch - where a finely-finished and very smooth steel plate provides a surface on which a small toolholder, with a flat base, could be manipulated

The facility was provided to mount a grinding wheel on the end of the motor spindle so that, with a support table fitted into a hole bored in the casting, tools could be sharpened when held in the graver.