4. Main movements for cylindrical turning and facing

Feed movement

For cylindrical turning the power to the longitudinal feed is transmitted by the feed shaft of the lathe. The turning tools primarily used are the side-cutting tool and roughing tool.

Figure 14 Cylindrical turning with the side-cutting tool

Figure 15 Cylindrical turning with the roughing tool

Because of the rotation, the amount of feed measured for the given scale graduation changes the diameter of the part by double that amount.

For 0.1 mm feed setting in transverse direction (feed setting- at the cross slide), the diameter is changed by 0.2 mm.

For the facing operation the power is also transmitted via the feed shaft of the lathe. The roughing tool is primarily used as cutting tool For economical reasons, cylindrical turning and facing can be combined. The time-consuming re-clamping/changing of the turning tool can thus be eliminated.

Figure 16 Combination of cylindrical turning and facing

The facing operation may be performed from the outside inwards or vice versa. In order to avoid convex (curved) surface shapes of the end faces, the tool slide is to be locked in longitudinal direction prior to cutting.

Figure 17 Facing from the inside outwards

The cutting movement is effected by the rotation of the part around its axis of rotation

Figure 18 Cutting movement when turning

What are the main steps in setting up the lathe for cylindrical turning and facing?
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