TM 5-3825-226-24
BASIC BLOCK
Place
tool
holder
(23)
on
the
1P2370
Micrometer Bracket Assembly. Align mark on tool
holder (23) with hole in shaft (24). Place tool bit (26) in
tool holder (23) and set the micrometer .070 in. (1.78
mm) less than the finish bore diameter of 3.7175± .0005
in. (94.425 ± 0.013 mm). Turn the bracket adjustment
arm until micrometer spindle aligns with tool bit (26).
Adjust tool bit (26) by pushing it with the 9S8521 Rod
(25) until tip of tool bit (26) touches micrometer spindle.
CAUTION
Do not sweep micrometer spindle
across tool bit.
SETTING TOOL BIT
23. 1P2366 Tool Holder Assembly. 24. Shaft. 25.
9S8521 Rod. 26. Tool bit.
Use a maximum of .025 in. (0.64 mm) for
rough cuts and .010 in. (0.25 mm) for finish cuts.
Wipe the boring bar and tool holder clean.
Place tool holder on the boring bar, with tool bit cutting
edge facing the direction of rotation. Assemble the tool
holder by placing lower half over the bolts, slide into slot
and tighten bolts. Slide boring bar in until tool is
approximately .12 in. (3.0 mm) from the bore.
Compare tool cutting tip with bore surface while turning
boring bar by hand, to insure correct tool setting.
FEED ENGAGED
27. Slot. 28. Pin. 29. Knob.
Set feed mechanism into feed by turning knob
(29) until pin (28) drops into slot (27).
NOTE: To set the feed mechanism
into feed on later
units, turn lever (A) up (the direction
of arrow).
LATER FEED MECHANISM
A. Lever.
Oil the bearing assemblies. Do not use
lubricant on the cutter. Use one-half inch electric drill
with universal joint (30) to feed the tool through the
bores. Service main bearings with .010 in. (0.25 mm)
oversize outside diameter are available to permit bores
to be bored oversize. Bore block to 3.7175 ± .0005 in.
(94.425 ± 0.013 mm).
BORING BLOCK
30. 1P2363 Universal.
DRIVING THROUGH FEED MECHANISM
(Typical Example)
30. 1P2363 Universal.
3-375
