Page 13
◊ V-BELT TENSION
After the machine has been in operation for some time,
the V-belts might need to be re-adjusted. Disconnect
the machine from power. Remove the lower right
access door. Check the belt tension; each belt should
deflect by about 1/2” - 3/4” when pushed moderately at
mid distance between the motor pulley and the roller
pulley.
If correction is required, raise or lower the motor
baseplate by mean of the tensioning bolt (
X
).
NOTE: Keep V-belts correctly tensioned to ensure
proper functionality of emergency stop brake (R).
The emergency stop brake must be able to stop the
sanding drum.
◊ SANDING PLATEN
The combi head has an adjustable platen with a
graphite pad. It is used during the finish sanding
passes, so during the rough sanding passes or
dimensioning, the platen is up and not used.
To adjust platen position, unlock the platen lock lever
(
Y
) and adjust height by mean of the height lever (
Z
).
A scale, divided in 0.1mm increments (approx. 0.004”),
helps in adjusting.
When at
above 0
, the platen is up and not used (for
roughing passes). Typically set at 1.5 mm up.
At 0
, the platen is even with the sanding drum and is
used for intermediate finishing passes (typically
100-150 grit).
Under 0
, the platen is lower than the sanding drum. It
is then doing the finish sanding (typically 180 and finer
grits). The platen should not be lowered by more than
0.2 mm (0.008”) per pass, not exceding 0.5 mm
(0.020”) maximum total, as burn marks and premature
graphite wear will occur.
During finish sanding passes, it is not necessary to use
the table height handwheel; adjusting the platen height
alone will be sufficient.
NOTICE:
The platen should always be kept clean after
sanding. If the workpiece has straight notches
across it, the graphite cloth and felt have worn out
and should be replaced immediately.
◊ FEED SPEED
The conveyor belt has 3 feed speeds, determined by
the position of the chain on the sprockets of the feed
motor and conveyor roller.
Remove the cap screw holding the chain cover in
position and you will have access to the chain.
When the chain is on the outer sprockets, the feed
speed is 32.8 FPM. When on the center sprockets, the
speed is 23 FPM and on the inner sprockets it is
16.4 FPM.
To change speed, loosen the pivot screw (
A
) and the
motor tension screw (
B
), lift the motor to release chain
tension, reposition the chain on the desired set of
sprockets and re-tension the chain. Tighten the motor
tension screw and the pivot screw to secure. Put the
chain cover back in position and secure with the cap
screw.
x
Z
Y
A
B
r
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