Figure 26. Position Of Cutter Bit for Straight Turning

Lathe Operations
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different diameters, the tailstock center is out of alignment with the

headstock spindle and realignment is necessary.

Continue cutting after

correct alignment is made, stopping the lathe at intervals to check the

tailstock center. After roughing, reverse the ends of the workpiece so that

the area held by the lathe dog can be turned. When the piece is within 1/32

to 1/64 inch of the desired size, reduce the depth of cut, reduce the feed,

increase the speed, and take light finishing cuts to the proper dimension.

Measure the workpiece after each cut, with micrometer calipers. Reverse the

piece again and, using shims under the lathe dog to prevent scoring of the

machined surface, finish the other end of the workpiece.

NOTE

Remember that if the workpiece is turned smaller than

the described size, it cannot be made larger and is

ruined.

Shoulder Turning.

(1) General.

It is frequently necessary to turn a workpiece so that it

will have two or more diameters in its length. For example, a bar 12 inches

long might be 3 inches in diameter for half its length, and 3 1/2 inches in

diameter for the other half. It would therefore have an abrupt step