10. Factory Parameters
Rebel
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Parameter Page 11
Face of Collet:
This parameter controls the stopping position of the front of the new material
being loaded into the lathe during a bar change. The distance is usually the measurement from
the facing flag to the face of the collet chuck. During the pre-feed step the front of the new bar
stock pushes the facing flag down. This releases the S4 proximity switch and starts measuring
the cycle start (M-code finished) signal is given to the lathe to end the bar change cycle. This
parameter is a master setting. It can be offset in the plus direction by the parameter “facing
length collet” on parameter page 3 to move the stopping point farther into the lathe. The
maximum feeding position is the distance minus the chucking length the part parameters. If
maximum end of bar is reached first, then it is used instead.
Max. End of Bar Collet:
Sets the forward limit of the bar pusher stroke when using a collet
chuck. The position is typically set with the tip of the bar pusher even with the rear of the
gripping surface of the collet pads. The control calculates the end of bar signal position by
subtracting the distance set in the Part Length parameter from this parameter. Once the
encoder shows the bar pusher position equal to or greater than the result of the calculation an
end of bar signal is sent to the lathe. This is the maximum position the pusher will go to when
feeding a bar. It overrides the face of collet minus the chucking length.
Face of chuck:
This parameter is the same as the Face of Collet parameter except that the
dimension is measured with the tip of the bar pusher even with the back of the gripping portion
of the chuck jaws.
