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TROUBLESHOOTING (Continued)
--PROBLEM--
Top face of
bedknife is
ground in a
convex shape
(high in the
center)
--POSSIBLE CAUSE--
A--Grinding wheel loading up
with grinding grit.
B--Too heavy a grind on the
final grinding pass.
C--Gib screws loose, or
carriage infeed screw loose.
D--Carriage has varying load
in either direction, because of
grit buildup inside linear
bearings.
E--Rails not straight.
BEDKNIFE GRINDING
--REMEDY--
Dress the wheel prescribed in
the Operators Manual.
Follow the procedures in the
Operators Manual. On the
final pass, crank down only
about .001" [.025 mm]. Let the
wheel spark out for 10-20
passes at about 5 ft/min, with
no additional infeed.
Tighten gib screws to prevent
movement (See Page 23).
Also check for any grinding grit
buildup behind the gib. Elimi-
nate backlash in horizontal
handwheel (See Page 24).
With linear actuator released
from the carriage, check for a
5 lb [2.25 kg] maximum
traversing load in both direc-
tions. If load varies, or car-
riage linear bearings are
excessively noisy, replace
bearings (See Page 19).
Check straightness. If not
straight, consult the factory
through your distributor. (This
is carefully checked at the
factory, so it is unlikely to be
the cause.)
31
--REASON--
A loaded wheel creates
undue pressure on the
surface being ground. Both
ends of bedknife move
because of this pressure,
allowing bedknife to rock on
the middle support.
For precise grinding, spark-
ing-out process is critical. It
eliminates excessive final-
grinding pressure on centers
and middle support, which
helps maintain grinding
straightness.
A loose gib, backlash in
infeed screw, or grit buildup,
allows grinding head to
move when grinding.
Uneven loading because of
grit buildup in bearings can
affect the straightness of
grinding. When grit buildup
is excessive, bearings may
be noisy and must be
replaced.
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