SCHUNK ROTA THW 1000, Translation Of Original Operating Manual, Page: 30 / 45

Function
30 02.00|ROTA THW / THWB |en
Base jaw position
A marking line between the jaw guides is milled on the face side of
the chuck (see drawing
(

9, Page 40) ). This marking line is the
positioning aid for the base jaws or top jaws. The outermost base
jaw or monoblock position is reached when the front face of the
base jaw or the unsplit top jaw agrees with the marking line in the
jaw change position (chuck open).
It is vital that this jaw position is adhered to so that all teeth are
engaged for the force transmission from the wedge bars to the
base jaws or top jaws.
Exchanging and turning the top jaws
When changing the top jaws, the serration must be cleaned.
Chuck jaws for maximum clamping repeat accuracy must be
turned or ground in the chuck under clamping pressure.
• When turning or grinding, ensure that the turning ring or
turning pin is clamped by the top jaws and not by the base
jaws.
• Keep the base jaws and top jaws screwed in place for recurring
work. Tighten the jaw mounting screws to the specified torque
(

3.6, Page 27) .
Tighten the jaw mounting screws with a torque wrench.
Never tighten the screws with an extension pipe or with hammer
blows.
4.4
4.5