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Use and maintenance manual S20DSP
SOLUTIONPROBABLE CAUSEPROBLEM
Rapid tooth wear
' Teeth pointing in the wrong
direction
.Set teeth in correct direction
' Blade worn in wrongly .With a new blade cutting
should be done at half--
speed and with downstroke
speed also at half normal
speed. After the blade has
been worn in (about 300 cm
2
of work for hard cutting ma-
terials and about 1000 cm
2
for soft cutting materials) the
cutting and downstroke
speeds can be brought up to
rated levels
' Material too hard .Check cutting speed, down-
stroke speed and blade pres-
sure, as well as type of band
saw being used
' Material defective .Surface defects: oxides,
sand, surface hardening.
Hardened inclusions in sec-
tion.
Reduce cutting and down-
stroke speeds or clean sur-
face.
' Cutting speed too high .Theteethslideonthema-
terial without cutting: reduce
cutting speed
' Head downstroke speed too
slow
.The band saw runs over the
material without removing it:
increase downstroke speed
' Insufficient coolant .Check coolant level and
clean pipes and jets
' Incorrect fluid concentration .Check and use the correct
concentration
' New blade inserted into a
partially--made cut
.The cutting surface might
have been subject to a loca-
lised heat--induced alteration,
making it harder: recom-
mence cut using a slower
cutting and downstroke
speed. There may be a
broken tooth from the old
blade lodged in the cut:
check and remove before re-
commencing work
' Flutter .Blade tension too low:
tighten.
Tooth shape or pitch unac-
ceptable: change type of
blade used.
Widia blade steady buttons
too far from the blade back:
adjust guide heads, rotating
them slightly to bring them
closer to the blade back.
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