Bandsaw failure guide 2012
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Transcript of Bandsaw failure guide 2012
BANDSAW FAILURE GUIDE
Main reasons for a Bandsaw failure
1. Band guidance malfunction 2. Wrong band selected 3. Error in cutting data 4. Machine malfunction 5. Defective band
• Band inspection can help determine the cause of failure
Tooth tip failure
• Description: – Cutting chips welded to tooth
tips
• Causes / Solution: – Too high feed and/or speed for
the material cut.
– Too fine TPI
– Failing chip brush
– Coolant failure
• No coolant
• Wrong type
• Too low volume
• Mis-directed
Tooth tip failure
• Description: – Wear on sides of teeth.
• Causes / Solution: – Too high band speed, teeth
rubbing in the kerf
– Material may be too hard or abrasive
– Back-guide allows teeth to rub the guides
– Insufficient overall set; sides of teeth rub in the kerf
– Teeth hit some part of the machine, causing rapid tooth wear
Tooth tip failure
• Description:
– Chipped and damaged teeth
• Causes / Solution:
– Improper break-in procedure
– Handling damage
– Hard spot in material
– Work piece not secure
– Too high feed pressure
– Excessive feed rate
Tooth tip failure
• Description:
– Heavy wear on tooth Tips
• Causes / Solution:
– Too fine TPI
– Too high band speed, generating high heat
– Too low feed rate, teeth rub instead of cut
– Improper break-in procedure
– Coolant problem
• Wrong type
• No or too low volume
• Misdirected
Tooth tip failure
• Description:
– Gullets loaded with chips
• Causes / Solution:
– Gullet capacity inadequate
• Too fine tooth pitch
• Too high feed rate, creating too large a chip
– Coolant problem
• Wrong type
• No or too low volume
• Misdirected
– Chip brush failure
Tooth strippage
• Description:
– Tooth strippage
• Causes / Solution:
– Too fine TPI
– Excessive feed rate/pressure
– Hard spot in the material
– Improper break-in
– Chip brush failure
– Handling damage
Body failure
• Description: – Wear of the back edge
• Causes / Solution: – Guide problem
• Too tight
• Worn or defective back guide
• Guides out of alignment
• Guides too wide apart
– Chips build-up in guide, scoring the top of the band
– Band not tracking properly, band is wearing on the wheel-flange
– Chips built up in guides, scoring the top of the band
Body failure
• Description:
– Gullet crack caused from guide wear
• Causes / Solution:
– Guide problem
• Too tight
• Worn or defective
• Out of alignment
– Excessive band tension
– Excessive feed pressure
Body failure
• Description:
– Fatigue cracks
• Causes / Solution:
– Too small wheel diameter
– Wheel mis-alignment
– Guide problem
• Worn-out
• Setting too wide
– Too fine TPI
– Too high feed-rate
– Too high band tension
Performance failure
• Description: – Crooked cutting
• Causes / Solution: – Band tension too low
– Guide problem • Too far apart
• Worn-out
• Guide arm loose
– Poorly adjusted
– Too high feed rate
– Too fine TPI
– Damaged teeth
– Band worn out
Performance failure
• Description:
– Vibration
• Causes / Solution:
– Improper break-in procedure
– Guide problem
• Too far apart
• Poorly adjusted
– Feed rate too high or low
– Band tension too low
– Work piece not secure
– Natural vibration - Band speed slightly to high or low
• Description:
• Causes / Solution:
• Description:
• Causes / Solution: