Page:Practical Treatise on Milling and Milling Machines.djvu/133

Rh Milling Bearings on Automatic Screw Machine Bed on a No. 3 B Heavy Plain Milling Machine

It is the usual practice to put the caps on bearings, and bore them out, but this operation shows how bearings can be milled to good advantage. The caps can be milled at another operation so accurately that it is only necessary to pass a reamer through the bearings after the caps are put on to line them up exactly.

The cutter is made in two parts that are interlocking, and thin washers may be packed between to maintain the correct diameter.

It should also be noted that the cutter has to be located at the end of the arbor because of the high projection on the casting.