Blade Guide Bearing Adjustment; Verifying Adjustment Accuracy - Jet J-7060 Operating Instructions And Parts Manual

7. Turn the single hex adjustment screw so that
blade starts to move away from shoulder of
wheel; then immediately turn the single hex
adjustment screw in the other direction so the
blade stops, then moves slowly toward the
shoulder.
8. Hold the hex adjustment screws with a wrench
and tighten the center locking screws. Make
sure the hex adjustment screws do not move
while tightening the center screws.
9. Install the two blade guide bearing brackets.
Position the guides so the bearings just touch
the blade.
10. Install left blade guard.
11. Close saw head cover, and secure with the four
knobs.

9.2 Blade guide bearing adjustment

Proper adjustment of blade guide bearings is critical
to efficient operation of the saw. The blade guide
bearings have been adjusted by the manufacturer
and should rarely require adjustment except after a
blade change. Failure to maintain proper blade
adjustment may cause serious blade damage or
inaccurate cuts.
It is always better to try a new blade when cutting
performance is poor. If performance remains poor
after changing the blade, make the necessary
adjustments.
If a new blade does not correct the problem, check
the blade guides for proper spacing. For most
efficient operation and maximum accuracy, provide
only very slight clearance between blade and guide
bearings. The bearings will still turn freely with this
clearance. If the clearance is incorrect, the blade
may track off the drive wheel.
Check blade to make sure
welded section is same thickness as rest of
blade. If blade is thicker at weld, the guide
bearings may become damaged.
If required, adjust guide bearings as follows:
1. Disconnect machine from power source.
2. Each guide set consists of 2 blade guides. The
inner blade guide is fixed; the outer blade guide
is adjustable. The outer blade guide is adjusted
using a knurled knob on operator side of blade
guide assembly.
3. A guide bearing is provided on the innermost
side of saw blade. The guide bearing is
mounted on an eccentric bushing.
4. Hold the bushing with a 3/4-inch wrench and
loosen the center locking screw with an Allen
wrench (see Figure 9).
5. Position the bearing by turning the bushing. Set
the bearing in contact with blade then back it off
very slightly so that it will still turn by hand.
6. Tighten the center locking screw with an Allen
wrench while holding the eccentric bushing in
position with the 3/4-inch wrench.
7. When adjustment is correct, the guide bearing
should rotate freely with slight pressure of the
finger (with the blade stopped).
8. Adjust blade-edge bearings so they just touch
the back edge of blade (see Figure 10).

9.3 Verifying adjustment accuracy

Test cuts can be used to determine whether or not
the blade has been accurately. Use 2-inch round bar
stock to perform these test cuts, as follows:
1. Connect machine to power source.
2. With the bar stock securely clamped in the vise,
make a cut through the bar stock. See Figure
11.
3. Mark the top of the bar stock.
4. Move the bar stock about 1/4-inch past the
blade so you can begin a second cut.
8
Figure 9
Figure 10