LNS GT 326-E, Instruction Manual, Page: 76 / 218

Chapter 7 GENERAL DESCRIPTION
7 - 23
GT 326-E
7.14 BAR PREPARATION
Bar preparation is the machining process which changes the shape of bar tip. It aims to get an
improved insertion process during automatic process. The bar preparation must be selected
according to the finger component the user chose. We recommend customers proceed bar
preparation in advance for best machining performance.
Chamfering
The very basic and necessary preparation. It’s strongly
recommended to apply this machining on each bar stock
when a finger chuck is selected.
Turning down
Due to strength concern, the maximum collet size within
a guiding channel range is limited by its own wall
thickness and therefore the maximum bar diameter is
limited. To maximize the bar stock diameter, the user is
recommended to turn down the bar tip as shown. The
maximum bar stock diameter should be kept 1mm below
the guiding channel.
Bar Preparation for pusher with cone head.
When the optional remnant disposal is selected to push
the remnant through the chuck of the lathe by the newly
loaded bar instead of being retracted in the bar feeder a
cone must be installed on the pusher instead of a collet.
For safety and performance reasons the bar end must
be chamfered at a 60 degree angle.
Please contact our office for further details.