HOWA MACHINERY H032M, Instruction Manual, Page: 38 / 52

-10-
Fig. 12
Fig. 9
Table 6
Bolt size M10 M12 M16
Tightening torque (N-m) 57.9 101 161
(4) Two bolts are used for one top jaw. As long as the installation
bolts provided for the standard soft jaws or standard hardened
jaws are used, the screw depth of the bolts in relation to the jaw
nuts is no problem, since the value is neither too much nor too
little. Should there be other bolt/nut combinations, however, be
sure to keep the screw depth so that the tip of the bolts will be
within 2 mm from the lower surface of the nuts, or at least not
projecting out from below the nuts' lower surface.
3.3 Forming Top Jaws
When the top jaws are installed, they must be
machine-formed to align flush with the work piece.
When the work piece is gripped, the jaw stroke
should be such that there is one-fourth of the jaw
stroke remaining, as measured from the stroke end.
Thus, if you are gripping the outside diameter (OD)
of the work piece with the jaws, one-fourth of the
inside stroke should remain, while you are gripping
the inside diameter (ID) with the jaws, the remaining
portion of the stroke should be on the outside(refer
to Fig.9).
The cylinder pressure when the top jaws are formed
should be the same as when the work piece is
actually being cut.
See Fig. 10 for the specific steps for forming the top
jaws.
Use exact torque for fastening bolts.
If less torque is used than specified in Table 6 above, the bolts may
loosen in the top jaws and/or the work piece could come off. If the
torque is greater than that specified the master jaws and/or top jaws will
deform and defective operation will result, leading to breakage and
release of the top jaws and/or work piece. In either case, the resulting
flying off of work piece and/or top jaws may lead to severe personal
injury or death to the operator and/or bystanders.
Use two bolts to secure one top jaw. Be sure to chouse the bolts
with appropriate length.
Use two bolts to secure one top jaw. If only one bolt is used, the top jaw
and/or the bolt may break. If the bolts used to secure the top jaws are
screwed in too shallow into the jaw nuts, the jaw nuts could break. Or, if
the bolts protrude from beneath the lower surface of the jaw nuts, the
top jaws are not secured no matter how far in the bolts are screwed. In
either case, if the screw depth is improper, the jaws and/or work piece
may fly off from the chuck and, in turn, may cause severe personal
injury or death to the operator or bystanders.
WARNING
WARNING