Page 113 - Turner 1st sem Practicals
P. 113
Condition of How to avoid and
centre hole Errors correct the errors
No bearing surface for Countersink mouth of
lathe centre. hole at 60°.
Insufficient bearing Countersink deeper.
surface for lathe centres.
Hole drilled too deep with Face end if the job will allow it.
centre drill.
Poor bearing surface. Ream the mouth with a
centre reamer.
Poor bearing surface. Countersink hole with a 60°
centre drill.
Wrong angle.
Centre hole drilled at Align work squarely when
angle to the axis of work. drilling the centre hole.
Face end and re-centre.
100 Producltion & Manufacturing : Turner - Exercise 1.3.33
