FINISHING END OF SHAFT

To face the ends, use a regular turning tool starting to cut from the

outside and feeding by hand towards the center with the cross feed.

Such a tool will leave a ridge near the center, as shown in Fig. 6.

This ridge is cut off with a sharp pointed, side cutting tool, as shown

in Fig. 7, which is also used for taking the finishing cut across the

whole end of the bar. When taking this finishing cut, lard oil, or some

other lubricant, should be used.

[Illustration: Fig. 6]

[Illustration: Fig. 7]

After the finishing cut has been taken, any small ridge, or fin that

remains at the edge of the center is removed by slightly changing the

angle of the tool in the tool post and allowing about ¹⁄₆₄ of an inch

play between the centers. Having the work loose like this when the

lathe is running, allows the extreme point of the side tool to extend

beyond the edge of the center and cut a smooth end.

The lathe should run slow for the finishing cut and fast when the

regular turning tool is used.

Elementary lathe practice · 第 11 / 30 题