81) For setting of tool for threading, it is aligned with the work by using

try square

centre gauge

thread plug gauge

template

Answer is:

centre gauge

Explanation:

For setting of tool for threading, it is aligned with the work by using centre gauge.

Threading tools are checked for accuracy for the 60 Degree angle by using a centre gauge

M 10 x 1.25 is a fine pitch thread

M 10 is a coarse pitch thread

Same tool is used for cutting external and internal threads

Answer is:

less than that for the plain turning operation

more than that for the plain turning operation

equal to that for plain turning operation

None of the above

Answer is:

Inserted tool bits are more advantageous while cutting threads

Before cutting internal threads, the hole should be chamfered

When internal thread cutting is done in a blind hole, a recess should be provided

When cutting internal threads, the core diameter may be equal to the size of external threads

Answer is:

Threads can be cut on a lathe by using simple gear train arrangement only

The 127 teeth gear is used as driven gear for cutting metric threads on a lathe having lead screw in TPI

The 63 teeth gear is used as a driver for cutting British threads on a lathe having metric lead screw

The teeth of the driver and driven are based on the pitch of thread to be cut and the pitch of thread on the lead screw

Answer is: