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Issue
Thermal cracks
Built up Edge (B.U.E.)
Vibrations
Mirage Machines Ltd ∙ 8-10 Enterprise Way ∙ Derby ∙ DE21 4BB ∙ UK ∙ t: +44 (0)1332 291767
f: +44 (0)1332 370356 ∙ sales@miragemachines.com ∙ www.miragemachines.com
Small cracks
perpendicular to
the cutting edge
causing frittering
and poor surface
finish.
Built up edge
causing poor
surface finish and
cutting edge
frittering when
the B.U.E. is torn
away
Machine vibrates
badly causing
poor surface
finish/accelerated
machine wear.
Doc: MML265
Issue: 004
Reason for wear
Thermal
cracks due to
temperature
variations
caused by:
Intermittent
machining
Varying
coolant
supply
Work piece
material is
welded to the
insert due to :
Low cutting
speed
Low feed
Negative
cutting
geometry.
Wrong cutting
data
Bad stability
Issue Date: 13.06.2013
Select a
tougher
grade with
better
resistance to
thermal
shocks
Coolant
should be
applied
copiously or
not at all.
Increase
cutting
speed
Increase
feed
Select a
positive
geometry
Reduce
cutting feed
Increase
cutting feed
Change
cutting
depth
Reduce
overhang
Page 33 of 39
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