Marshalltown SP684 SURFACE SHARK Surface Planer - Manual (Page 16)

PAGE 16 SP684 SuRFACE ShARK SuRFACE PLANER
variances in material thickness and manufacturing
processes can affect the final thickness of both flails
and spacer washers. because of this occurrence, trial
and error is important for assembling flails and spacer
washers on a flail drum. by mixing and matching
flails and spacer washers of specific thicknesses, the
required number of components can be assembled on
a flail drum in a minimum amount of time.
USE ONLY FACTORY SUPPLIED SPACER
WASHERS ON THE FLAIL DRUM. OTHER WASHER
TYPES AND/OR CONFIGURATIONS CAN PRODUCE
ABNORMAL WEAR AND ELONGATION, RESULTING
IN COMPLETE SEPARATION FROM THE FLAIL
DRUM. SPACER WASHER SEPARATION CAN
RESULT IN PROPERTY LOSS AND/OR PERSONAL
INJURY.
FIGuRE 6
FLAIL DRUM RODS
Application: SP684 SURFACE SHARK
Flail drum rods are manufactured from 1/2 inch
diameter alloy steel. They are heat treated in a two
step process that yields a surface hardness that resists
wear and extends service life.
Drum rod service life is difficult to predict because
of the large number of flail configurations and work
surface materials. Normal wear should be uniform
about the rod circumference. FIGuRE 7.
FIGuRE 7
Problems Encountered by uneven Component Wear:
1) Inadequate free play exists between the flails/spacer
washers and the support plates of the flail drum. If
the flails and spacer washers do not have complete
freedom of movement, they will not be capable of
properly rotating about the flail drum rod. The result is
rod wear confined to two locations that are usually 180
degrees apart. FIGuRE 8. variances in flail and spacer
washer thicknesses affects free play when assembled
on the drum. because free play is also created during
the planing process due to actual flail and spacer
washer wear, a certain amount of “tightness” can
sometimes be tolerated without affecting the service
life of the drum rods or flails. The specific amount of
“tightness” can usually be determined through trial and
error. If the flails and spacer washers appear too tight
on the drum, remove an appropriate flail or washer
and reassemble the drum. If a short, operational
test indicates normal component wear patterns, the
apparent problem has been solved. A general rule for
consideration: it is better to have the flails and spacer
washers a “little too loose” on the drum than a “little
too tight”.