Duro Three-jaw chuck, high efficiency hand-operated chucks, with safety feature, self-centering
Higher speed
Higher clamping force
Larger through-hole
Steel body, jaw guides
hardened and ground
The chuck is recommended for applications requiring
extremely high gripping forces, high concentricity and
very reliable, repeatable long-term accuracy.
For lathes. Suitable for milling machines, dividing attachments
and machining centres in connection with a base plate, non
rotating.
Large, straight surfaces transmitting the force from the key bar
to the jaw teeth guarantee long life and produce a very high
gripping force combined with an accuracy which is twice high as
required by DIN 6386.
The high gripping force is achieved without much physical effort
by manually turning the key.
Jaw operating mechanism
The jaws can be quickly and
conveniently reversed,
exchanged or relocated over
the entire gripping range after
disengaging the key bar by
turning the wrench counter-
clockwise, the indicator pin
appears (7). In this position,
the jaws are safely locked (6)
against movement so that
they cannot fly out if the
machine spindle is started
inadvertently. Each jaw must
therefore be unlocked by
pressing the corresponding
pin (8) on the outside
diameter of the chuck.
The jaws retain their accuracy if they are always used on the same
chuck and if base jaws and top jaws are left bolted together and
stored as a matched set for recurring work. It is therefore advisable
to stock several jaw sets.
Operating
The tangentially arranged operating screw (1) engages the internal
thread of the actuating key bar (2) to move a slide (3) which in turn
moves the drive ring (4). Two further slides in the drive ring (4)
transmit the force to the other two key bars. The key bars are
provided with helical teeth which engages the teeth of the base jaws
(5) so that the workpiece is gripped accurately and concentrically.
![[Duro hand-operated chuck]](duro1.jpg)
![[Duro hand-operated chuck]](duro.gif)
