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Adjusting the cutter bushing gap
If the bushing gap is too big, material is dragged down
between the bushings creating a burr, especially with flexibles.
This may lead to jamming within the bushings where the
upstream side of the cut extrudate actually hits against the
downstream bushing surface. This is especially apparent with
flexibles with non-concentric walls where a slight bow is pre-
sent.
● Locate the downstream bushing such that it touches the
blade without deflecting it. Lock it in place and rotate the
blade to check proper gap.
● Locate the upstream cutter bushing with 0.001-0.002 inch
of the blade and lock it in place. Rotate the blade through
the set bushings to insure proper gap. NOTE: Because
blades are rarely perfectly flat, it is possible that a swish-
ing sound will be heard.
● If hairs are present on only the upstream cut end of a tube
or profile, it may be necessary to allow a 0.002-0.005
inch gap on the downstream bushing to allow the blade to
slightly move with the extrudate during the cutting cycle
and not cause excessive frictional heat which actually
melts the extrudate. NOTE: Blade/bushing lubrication can
also help to solve this problem.
ALL ABOUT
CUTTER
BUSHINGS
A
PPENDIX C-5
UGE059/1003 ALL ABOUT CUTTER BUSHINGS