Bosch 6000 User's Guide Page 226

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Chapter 6. Following
211
Continuous Cut-to-Length Application
This application requires automobile trim to be cut to a pre-defined length. The saw is
controlled by axes #1 and #2 on the 6000 controller. It must be moving with the material
while the cut is being made (axis #1), and also move perpendicular to the trim (axis #2) to
actually make the cut. The trim comes in long stock which moves continuously under the
cutting area.
The leading edge of the trim stock is detected with a sensor connected to trigger #1 which is
located 4 inches from the home position of the saw. Axis #1 will be following the trim based
on an encoder mounted on the trim via a friction wheel. The encoder is a 1000-line encoder
and the wheel is geared to give 2 revolutions per inch of trim, resulting in 8,000 post-
quadrature steps per inch of trim. Axis #1 has a resolution of 4,000 steps per rev and is
connected to a 2-pitch leadscrew 24 inches in length. Axis #2 is similar in mechanics but its
length is 10 inches. The travel on Axis #1 will be controlled by the speed at which axis #2
makes its cut. The travel on axis #2 is a fixed speed of 5 inches per second, with a fixed cross
stroke of 5 inches. Limit switches are in place for safety.
Raw Stock
4"
Axis #1
Axis #2
E
Sensor
Encoder
Sensor
Encoder
Sensor
Encoder
When stock is sensed, the master cycle
position is assigned to 3.7"
Axis #1, initially 4.0 inches from the sensor,
begins to accelerate when stock reaches
master cycle position - Ø
Synchronization takes place over 0.5
inches of Axis 1 travel, and 1 inch of
stock travel. Axis #1 travel becomes
synchronized 0.2 inches from end of stock
Raw Stock
3.7"
Axis #1
Axis #2
E
4"
Raw Stock
4.7"
Axis #1
Axis #2
E
4.5"
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