Page 235 - Parlec Catalog

Precision Finish Boring System

Operating Instructions 233

USING THE INCH VERNIER SCALE USING THE METRIC VERNIER SCALE
Find the line in the vernier scale that exactly lines Find the line in the vernier scale that exactly lines
up with a reference line. up with a reference line.

Diametral increases in .001” are made by adjusting Diametral increases in .02 mm are made by adjusting
the Dial clockwise one full line on the fixed scale. the Dial clockwise one full line on the fixed scale.

Diametral increases in .0001” are made by adjusting Diametral increases in .002 mm are made by
the Dial clockwise until the appropriate line on adjusting the dial clockwise until the appropriate
the vernier scale lines up with the next fixed scale line on the vernier scale lines up with the next fixed
reference line. scale reference line.

This Example Shows .001” Adjustment This Example Shows .02 mm Adjustment

Before adjustment After adjustment Before adjustment After adjustment
This Example Shows .0005” Adjustment This Example Shows .01mm Adjustment

Before adjustment After adjustment Before adjustment After adjustment

CALCULATING BACK BORE RANGE

ƒ Back Bore Diameter is the same as range in the charts
Back Bore Diameter
page 234 and 235.
Overhang
ƒ Minimum Through Bore Diameter is calculated:
(PC Diameter/2) + (Back Bore Diameter/2) +
minimal clearance (.010)

ƒ Overhang of insert from boring bar connection should
be measured to make sure there is enough clearance.
Calculate (Back Bore Diameter - Through Bore Diameter)/2
PC Diameter
Through Bore Diameter

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