Table of contents
3QLCLM
Edition: 04/2014
19
If the top jaw is adjusted to a specific clamping diameter, the jaw mounting bolts must be loosened
through two rotations with the Allen wrench (in accordance with 911) and the top jaw must be pushed
into the corresponding clamping diameter with the sliding blocks and screws.
If there is a change of top jaws from outer to inner clamping,
watch out for change in the direction of movement of the top jaws,
or if the top jaws are changed for example from hard top jaw type HB for roughing operation to soft top
jaw type WBL for finishing, then the jaw mounting bolts must be loosened through two rotations (with
Allen wrench) and the top jaw must be removed completely from the master jaw.
Clean any chips or dirt from the chuck bore and master jaw before removing the top
jaw from the master jaw!
If the processing of the clamped work piece is interrupted for many hours, the power chuck and/or the
clamping cylinder must be actuated again.
4.3.2 Centrifugal force compensation
Each master jaw is assigned to a counterweight through a reversing lever. When the chuck is rotated, it
uses its centrifugal force to balance the centrifugal force of the base and top jaw, which otherwise may
result in significant loss of gripping force. This simple, robust and direct centrifugal force compensation
system ensures high gripping force of the 3QLCLM power chuck in the entire speed range on the one
hand and allows selective processing with reduced gripping force on the other hand even at maximum
finishing speeds.
4.3.3 Lubrication
The movement of the centrifugal weight in the rear part of the chuck is used to supply lubricant to all
sliding surfaces during each chucking stroke. The excess lubricant inside the chuck is centrifuged to
the required points through the rotation of the chuck and is available again for the next chucking stroke.
When compared to the traditional chuck guides, the 3QLCLM type power chucks can use lubricants
with low viscosity, which can reach the sliding surfaces in a better way due to centrifugal capability.
This improves the reliability of the lubrication function and makes cleaning and maintenance of the
3QLCLM power chuck much easier.
4.3.4 Sealing of the power chuck
Type 3QLCLM power chucks maintenance-free thanks to their sealing and are sealed against entry of
lubricants and functional disruptions caused by the entry of coolants, dirt and chips.
