SCHUNK ROTA THWvario, Assembly And Operating Manual

Page: 45 / 77

Function
01.00|ROTA THW vario |en-US 45
Base jaw position
A marking line between the jaw guidances is milled on the face
side of the chuck. This marking line is the positioning aid for the
base jaws or monoblock jaw. The outermost base jaw or
monoblock position is reached when the front face of the base jaw
or the unsplit monoblock jaw matches up with the marking line in
the jaw change position (lathe chuck open).
WARNING
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 monoblock jaws.
Replacement or enlargement of jaws
Chuck jaws for maximum clamping repeat accuracy must be
turned or ground in the lathe chuck under clamping pressure.
• When turning or grinding, the jaw turning ring or turning pin
must be 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.
WARNING
Tighten the jaw mounting screws with a torque wrench. Never
tighten the Allen key with an extension pipe or by hitting it with
a hammer.
Center sleeve range
Different center sleeve variants can be inserted into the chuck.
See catalog for order numbers and detailed information.
• You can leave the base jaws (item 2) in the chuck. Move them
to the outermost permissible position. To do this, push the
piston (item 3) to its front end position.
• Remove the screws (item 43) and use the threaded extraction
hole to push off the center sleeve (item 4) away from the chuck
body (item 1), and then pull it out completely.
9.2
9.3
9.4