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A clock maker friend called me to ask how to cut internal teeth on a ring gear. The gear OD is about 3 inches and inside 2.75 inches, width is 3/16 and made of brass. Is this a impossible task on a milling machine with dividing head rotary table? I figure if it can be done you guys would have...

Horizontal Surface Grinders make a flat finish on many kinds of material. Lets say 6 inch square by 1/2 inch plate of steel. Question is, doesn't the diameter of the grinding wheel change ever so slightly from the beginning of the job to completing it? and if so would not the finished surface...