Page 124 - Turner 1st sem Practicals

A work having more than one diameter should be gripped
on the larger diameter while parting.

Intermittent feed tends to dull the tool's cutting
edge.

Heavy feed causes jamming and tool breakage.
Use sufficient coolant on steel. Brass and cast iron should
be cut off dry.

Make sure the saddle is locked during the entire operation.
Reduce the rate of feed, when the work is almost cut off.
While parting off long work, it should be supported with the
tailstock centre.
Use a right hand offset tool-holder. (Fig 6)
If the machine is in good condition, the automatic cross
feed may be used.
When the tool has penetrated to about the depth of its
width, withdraw it and move it sideways with the compound
slide and feed again.

The above operation should be repeated frequently to
minimise the tendency of the tool to dig in and cause
trouble.
When the parting off operation is almost completed, hold
the workpiece by hand to prevent it from falling, so that
damage can be avoided.

Producltion & Manufacturing : Turner - Exercise 1.3.35 111