Test Cutting To Verify Adjustment; Blade Speed - Jet HBS-812G Operating Instructions And Parts Manual

Keep fingers clear of blade
and wheel to avoid injury.
7. Turn set screw to stop shifting of blade on
the wheel as it gets closer to wheel flange.
Put a six-inch length of paper between blade
and wheel. The paper should not be cut as it
passes between wheel flange and blade.
8. Turn set screw a small amount. Repeat the
insertion of paper between wheel flange and
blade until paper is cut into two pieces.
NOTE: You may have to repeat the check
with the paper several times before the
blade and the flange cut the paper into two
pieces. Do not
Patience and accuracy here will pay off with
better, more accurate, quieter cutting and
longer machine and blade life.
9. When the paper is cut, back off the set
screw slightly. This assures that the blade is
not touching the flange of the wheel.
10. Tighten two screws (E, Figure 21).

9.9 Test cutting to verify adjustment

Test cuts can be used to determine whether or
not you have adjusted the blade accurately. Use
2-inch round bar stock to perform these test
cuts, as follows:
1. With bar stock securely clamped in the vise,
make a cut through the bar stock (see
Figure 22.)
2. Mark the top of the bar stock.
3. Move the bar stock about 1/4-inch past the
blade so that you can begin a second cut.
4. Rotate the bar stock 180 degrees so the
mark you made is now at the bottom of the
cut.
5. Make a cut through the bar stock.
hurry the adjustment.
6. Use a micrometer to measure the thickness
variation of the disk you have cut from the
bar stock. Measure at top and bottom of
disk.
The saw blade can be considered correctly
adjusted when the variation measure is no more
than 0.012 inch across the face of the disk.
If you do not have a piece of 2-inch bar stock
available for a test cut, use a larger diameter
test piece rather than a smaller one. The
maximum thickness variation on any test piece
should be no more than 0.003 inch, per side, per
inch of stock diameter.

9.10 Blade speed

1. Turn machine OFF.
2. Turn lever (Figure 23) to desired setting –
1 = 148 feet per minute
2 = 208 feet per minute
3 = 255 feet per minute
Do not change blade speed
during cutting operation.
Material chips or shavings are the best indicator
of proper blade speed and downfeed rate. See
section 11.4, Evaluating cutting efficiency.
16
Figure 22