Problems possible causes solutions
heavy wear on one side on centring spade
• tool not central tool turret/holder may have shif-
ted – readjust machine
Withdrawal groove on one side
• tool not central tool turret/holder may have shif-
ted – 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
position
• machine axis 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 with adjustable tool
• wrong cutting edge radius used use correct cut-
ting edge radius
• setting wrong correct setting
ENGLISh
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