Jet Tools J-7040 Maintenance, Test Cutting to Verify Adjustment Accuracy, Cleaning, Lubrication

the center locking screw with an Allen wrench (see figure 12).

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 13.)

5.Tighten the center locking screw with anAllen 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 bear- ings 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 19).

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 14.)

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 varia-

1. Clamp in vise and mark top of barstock here

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

tion of the disk you have cut from the bar stock. Mea- sure at the top and bottom of the 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 avail- able 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 (figure15).

3.Adjust the stop as required and retighten jam nut.

Jam Nut
Adjustment
Screw
Switch	Limit
	Switch
Roller

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

13

5.Measure here...

New slice

6. ...measure

here

7.Differences between measurements at edges of disc should be less than .003 inches per inch per side of stock diameter

frequency should be determined by how often the

saw is used.

Lubrication

Lubricate the following components at the specified

Figure 14: Cutting a test disc

frequencies and using the lubricants as defined: