LNS HYDROBAR SPRINT 555, Troubleshooting And Spare Parts Manual

Page: 63 / 111

Chapter 2: Common Issues
HYDROBAR SPRINT 555
2-5
Collets
Description:
The Hydrobar Sprint 555 bar feeder is equipped with a collet on the front of the pushing rod in which the bar stock is inserted
mechanically during top-cut positioning. The collet grips the bar stock so that once the last piece has been cut off the remnant can be
removed by the bar feeder, and for Swiss style machines so the pusher stays with the bar stock while the machine makes its Z-axis
movements. Once the material has been consumed, the remnant is pulled back through the spindle; it is extracted from the collet of
the pushing rod, and dropped in the remnant tray. The bar feed indexes the chain magazine rack; the carrier flag advances the bar
forward in front of the pusher; the vise grabs the bar stock and the carrier flag returns home; the guiding channel closes and the new
bar is inserted into the collet and advances the new bar to top-cut position. This cycle is continued until there is no bar stock left on
the magazine.
Due to the collet being a wear item, after a period of time where the collet will expand and contract for each bar that is inserted and
extracted, the collet will eventually lose its ability to grip the bar how it is designed to grip. Inserting and extracting an unprepared bar
can severely reduce the life expectancy of the collet.
The following chart discusses possible problems that might be occurring with the bar feeder due to the collet:
Problem Possible Cause/s Solution/s
The remnant remains in the spindle when
the pusher is retracting to the home
position.
•
Collet has been damaged and will
no longer hold bar stock.
•
Collet is too large for bar stock.
•
Check collet for damage and make
sure the collet I.D. is the right size
for bar stock
(refer to Guiding
Channel Reference Chart
in the
Hydorbar Sprint 555 Instruction
Manual).
Bar stock will not insert into collet.
•
Collet is too small for bar stock.
•
Collet has been damaged.
•
Check collet for damage and make
sure the collet I.D. is the right size
for bar stock
(refer to Guiding
Channel Reference Chart
in the
Hydorbar Sprint 555 Instruction
Manual).
Bar stock will not extract from collet.
•
Bar stock has been pushed into the
throat of the collet.
•
Hardness of the material.
•
End of bar stock has become
misshapen.
•
Check to make sure that vise jaws
grip the bar stock.
•
Check collet for damage and make
sure the collet I.D. is the right size
for bar stock
(refer to Guiding
Channel Reference Chart
in the
Hydorbar Sprint 555 Instruction
Manual).