Sherline Boring Head Adjustment Dial 31570
Boring Head Adjustment Dial
Tighten the dial to increase diameter. To reduce diameter, loosen the 10-32 and 4-40 screws and slide back.
One turn of the 4-40 screw dial will produce an increase of .050″ in the bored diameter. Each increment on the dial is 7.2° which produces a rotation of the screw equivalent to .001″ in the bored diameter.
Major increments are marked on the dial at 10 (.010″), 20 (.020″), 30 (.030″), 40 (.040″) and 0 (.050″).
The boring head is NOT included and is sold separately. This dial is a replacement part for the Sherline 3054/3049 boring head.