Problems  Possible Causes  Solutions - Komet KUB Centron Mode D'emploi

KOMET KUB Centron®
Problems  possible causes  solutions
Short tool life types of wear on inserts
• cutting speed to high  select correct cutting speed
• cutting material with too little wear resistance  select
grade with higher wear resistance
• tool overhang too great  if possible use shorter tool
• damaged insert seating  check tool, change if
necessary
• clamping device not stable enough  improve stability
Bore narrows at bottom
• chip jam on external cutting edge  use different chip
fracture geometry, increase feed if necessary
• material very soft  increase cutting speed, reduce feed.
Use positive chip geometry
• axial adjustment of central drill bit not the best  adjust
setting as shown on setting sheet in operating instructions
Bore widens at bottom
• chip jam on internal cutting edge  use different chip
fracture geometry, increase feed if necessary
Bad surface finish
• bad chip removal  improve cutting parameters: increase
cutting speed reduce feed
Bild up on cutting edge
• cutting speed too low  increase cutting speed
• insert too negative  use positive geometry
• coating not suitable  select correct coating
Friction marks on tool shank
• bore diameter too small  check setting
• chip removal problems  improve cutting parameters,
check geometry of inserts
• cutting edge corner radius too large  use correct cutting
edge radius
• chip jams on support element, fractured support element
 where basic element < 6 × D use of support element can
be dispensed with
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Please see notes on safety (page 21)!
Problems  possible causes  solutions
heavy wear on one side on central drill bit
• tool not central  tool turret/holder may have shifted –
readjust machine
Withdrawal groove on one side
• tool not central  tool turret/holder may have shifted –
readjust machine
Fracture on external cutting edge
• feed rate too high  reduce feed rate
• interrupted cut  change to tougher insert grade
• cutting edge corner radius too small  use insert with
larger cutting edge radius
Bore too small/ too large
• machine not at X-0 position  move axis to correct posi-
tion
• machine axis shifted  readjust machine
heavy wear on one side on central drill bit
• insufficient guiding  check length setting on central drill
bit
Fracture on external cutting edge
• feed rate too high  reduce feed rate
• interrupted cut  change to tougher insert grade
• cutting edge corner radius too small  use insert with
larger cutting edge radius
Bore too small/ too large with adjustable tool
• wrong cutting edge radius used  use correct cutting
edge radius
• setting wrong  correct setting
ENGLISh
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