HOWA MACHINERY H3EF, Инструкция по эксплуатации, Страница: 38 / 52

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Fig. 11
3.3 Forming Top Jaws
When the top jaws are installed, they must be
machine-formed to align flush with the work piece.
The best position to clamp the work piece for this
chuck is at the middle of total jaw stroke concerning
the function and accuracy.
The centerline for internal
surfaces of draw bars is coincides to that of the chuck
body when the jaw stroke is at the middle of total jaw
stroke.
If impossible, 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 of the work piece with the jaws,
one-fourth of the inside stroke remains.
The cylinder pressure when the top jaws are formed
should be the same as when the work piece is actually
being cut.
See Fig. 12 for the specific steps for forming the top
jaws.
Do not grip near the end of the jaw stroke.
Forged or molded work pieces have surface irregularity as far as they
are not machined. The chuck may not be able to grip such a work piece
in a stable state. Gripping a forged or molded work piece, not
machined, near the end of the jaw stroke will cause insufficient gripping
force, and the application of the tool to the work piece may cause the
work piece to slip out of the jaws and fly off. This may cause severe
personal injury or death to the operator or bystanders.
WARNING