FY->Module-6 : THREAD CUTTING - Practice Mode

1) What is the minor diameter of Trapezoidal square thread Tr 40 x 7 depth clearance of 0.01 mm?

32.98 mm 33.00 mm 36.49 mm 36.50 mm

Correct Answer: 32.98 mm

2) What is the minor diameter of screw thread SQ 62 x 10.5 with depth clearance of 0.12 mm?

46.64 mm 51.26 mm 51.88 mm 51.00 mm

Correct Answer: 51.26 mm

3) How many un-numbered divisions on the British chasing dial?

3 4 12 18

Correct Answer: 4

4) What is the formula for finding gear ratio for fractional pitch thread?

DR/DN = Leads of screw to be cut X No. Of threads per inch of lead screw DR/DN = TPI on lead screw/ TPI to cut DR/DN = Lead of head screw/ Lead of work DR/DN = Lead of work/ No. Of threads per inch

Correct Answer: DR/DN = Leads of screw to be cut X No. Of threads per inch of lead screw

5) Calculate the gear ratio to cut a 1/4 inch lead on a lathe with lead screw of 2TPI?

(2/3) (3/4) (1/2) (1/4)

Correct Answer: (1/2)

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