Test Cutting To Verify Adjustment Accuracy; Adjustment Of The Limit Switch; Maintenance; Cleaning - Jet J-7040M-4 Operating Instructions And Parts Manual

4. Position the bearing by turning the bushing. Set
the clearance at approximately 0.001 inch. The
blade should be in a vertical position between the
bearings (see figure 15).
5. Tighten the center locking screw with an Allen
wrench while holding the eccentric bushing in
position with the 3/4-inch wrench.
6. Use the same procedure to adjust the other guide
bearing.
7. When the adjustment is correct, the guide
bearings 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 the blade (see figure 21).
Test Cutting to Verify
Adjustment Accuracy
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 the bar stock securely clamped in the vise,
make a cut through the bar stock. (See figure 16.)
2. Mark the top of the bar stock.
3. Move the bar stock about 1/4-inch past the blade
so 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.
6. Use a micrometer to measure the thickness
variation of the disk you have cut from the bar
stock. Measure at the top and bottom of the disk.
1. Clamp in vise and mark top
of barstock here
14
5. Measure
here...
New slice
6. ...measure
here
Figure 16: Cutting a test disc
2. Cut off a slice of
the bar stock
3. Rotate stock in vise
so mark is at bottom
4. Cut off a new
slice from the
stock
7. Differences between
measurements at edges
of disc should be less
than .003 inches per
inch per side of stock
diameter
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.
Adjustment of the Limit
Switch
1. The limit switch is provided to shut off the saw
motor when the workpiece is cut through.
2. To set the limit switch, loosen the jam nut on the
limit switch stop (see figure15).
3. Adjust the stop as required and retighten the jam
nut.
Figure 15: Limit switch adjustment

Maintenance

Cleaning

1. Clean off any preservative on machine surfaces.
2. After cleaning, coat the machined surfaces of the
cut-off saw with a medium consistency machine
oil. Repeat the oil coating process at least every
six months.
3. Clean up accumulated saw cuttings after use.
Make sure the lead screw is kept free of saw
cuttings and other material that would cause
damage.
4. Clean the chip sludge from the coolant tank. The
frequency should be determined by how often the
saw is used.
Limit
Switch
Switch
Roller
Adjustment
Screw
Jam Nut