Thread chasing dial is used to catch the thread when threading on lathe

Worm gear of chasing dial engages with the lead screw while thread chasing

Thread chasing dial is an additional part of the lathe carriage

Thread chasing dial stops rotating when the half nut lever is engaged

only at one particular position

only at numbered or un-numbered division

at opposite position

anywhere

Chaser is a single point cutting tool

Cutting threads by a chaser is slower process than that by a single point tool

Cutting threads by chaser gives better finish

The same chaser can be used for cutting any pitch of thread irrespective of the type of chaser used

Red hotness temperature is higher for high carbon steel tool than that of carbide tool

The property of tool chipping off with vibration is more for cemented carbide tools than that of HSS tools

Ceramic tool has more resistance to shock as compared to HSS tools

HSS tool can work at more spindle speed and feed than cemented carbide tool

Top rake angle

Front clearance angle

Side clearance angle

Back clearance angle