Course: PMT 250 Multi-Axis CNC Programming (Section 060)

Bar Feeder Lessons

Bar Feeding Safety
Bar Feeding Safety

- Make sure the proper spindle liners are in place.

- Spindle liners are oversized and do not grip on to the part.  If the part starts to vibrate check the clearance in the bar-liner clearance.
- Always machine a chamfer on the leading edge of each bar in the bar feeder.
- Ensure that the bar feeder is in line with the spindle liners in the CNC lathe.

- The larger the bar diameter, the shorter the bar and the closer the bar liner fit.
- Make sure the bars are straight.
- Always wipe down (clean) the bars before setting them on the loader tray.
- Bar should not extend past the end of the liner when in operation.
- Reduce speeds (G50) when using longer bars to reduce vibration.
- Only use the 3/8" push rod for material less than 3/4" diameter.
- The end of bars should be 90°, if not an inaccurate length of bar might occur.
- All bars in the tray should be at least 12" inches long. or longer than the distance from the liner to the beginning of the bar feeder.
- Larger diameter stock should be limited to 36" inches.
- When using the 3?8" inch pusher make sure to withdraw it from the liner before the  lathe starts turning.  Set the minimum retract to 32" inches.
- Store un-used liners in the rack mounted in back of the bar feeder.

- Always check the set-up of the bar feeder before operation.