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W1737/W1738 Owner's Manual (Mfg. 10/09+)
OPERATIONS
Jet Air Flow
Theairjetlocatedattheairfork sendsastreamofair
across the air fork and into the air stream receiver (see
Figure 23). Assoonasthesandingbeltobstructs this
stream of air, a piston changes the direction of belt
movementtotheleft.Yourgoalistoadjustthisstream
of air so the system uses the least amount of air and yet
the machine still oscillates consistently.
To adjust the jet air flow, do these steps:
1. TURN OFF and LOCK your master power switch.
2. Adjusttheairregulatorto70PSI.
3. Open both upper access doors on the sander, loosen
the sanding belt tension, and slide the belt so the
air stream is unobstructed.
4. Loosenthejamnutandturnthejet adjustment
knob (Figure 24) clockwise until the air stream is
reduced to a minimum.
5. Turnthejetadjustmentknobcounterclockwise,
and use a piece of cardboard to alternately block
and unblock the air stream until the upper drum
justbeginstoreactandmoveleftand right.
6. Turnthejetadjustmentknobcounterclockwisean
additional 1⁄2turnandtightenthejamnut.
7. Complete Belt Tracking on Page 22.
Figure 23.AirJetandairforkassembly.
Figure 24.AirStreamadjustmentknob.
AirStream
Receiver
AirFork
AirJet
AirStream
Adjustment
Knob
Lock
Lever
Height
Lever
Scale and
Pointer
Using the Platen
The platen controls (Figure 25) on your sander allow for
three basic types of sanding. Note: The platen scale is
broken down in millimeter increments, and is for only
reduced-platen sanding depth positions. For aggressive
sanding, retract the platen to the Platen Up position,
adjust the table, and let the drums make the deep cut.
Platen Up — The platen is above the level of the sanding
rollers, so the front roller removes large amounts of
material quickly, but leaves a rough finish.
Platen Even — The platen is even with the sanding
rollers, so the rollers work together with the platen to
produce intermediate/final finishing.
Platen Down — The platen is 2mm below the sanding
rollers, so the platen gives a smooth and feathered
finish.Avoidloweringtheplatenmorethan2MMbelow
the sanding belt rollers.
Figure 25.Platencontrols.