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 TM 9-2815-226-34-1
(h) Back off micrometer thimble then recheck dimension.
(i) Remove centering ring.
(j) Slide ST-1177-28 tool bit holder onto micrometer base shaft.
(k) Aline scribe line on tool bit holder with scribe line on base shaft. This alines through-hole in base
shaft with tool bit hole in holder.
(l) Select tool bit holder which is short enough so it does not extend into bore of tool holder.
(m) Insert tool bit into bit holder.
CAUTION
TO PREVENT CHIPPING OF BIT, DO NOT TIGHTEN MICROMETER SPINDLE
AGAINST TOOL BIT POINT.
(n) Set micrometer to 4.750 in. (120.650 mm).
(o) With ST-1177-49 cutter key inserted in through hole of base shaft, carefully push tool bit tip against
micrometer spindle. Tighten tool bit retaining setscrew in tool bit holder.
(p) Back off micrometer then recheck dimension. Tool bit is now set at proper length for boring of new
rod caps to standard size.
(q) Back off micrometer and remove cutter holder from micrometer base.
3-93
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