53) Find out the rpm of a lathe spindle for a 50 mm bar to cut at 31.4 m/min.

54) The lest count of a vernier caliper in which 19 (19 mm) main scale divisions are divided into 20 equal divisions in the vernier scale will be

55) Determine the height of slip gauges for an angle of 30 degree using a sine bar of 200 mm length

56) Find the cutting speed ofr a tool to cut a shaft of 14 mm radius rotating at 2 revolutions per secon

57) What is the depth of thread for M10 x 1.5?