Jet Tools J-7060 Maintenance, Adjustment of Limit Switches, Cleaning, Lubrication

14

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 variation of the disk you have cut from the bar stock. Measure at the top and bottom of the disk. The saw blade can be considered correctly ad- justed when the variation measure is no more than 0.012 inch across the face of the disk.

Note: 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. Maximum thickness variation on any test piece should be no more than 0.003 inch, per side, per inch of stock diameter.

Adjustment of Limit Switches

Adjustment of Lower Limit Switch

1.The lower limit switch is provided to shut off the saw blade drive motor when the workpiece is cut through. The switch causes the saw head to raise to its uppermost stop.

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.

Adjustment of Upper Limit Switch

1.The upper limit switch is provided to stop the saw head when it reaches its uppermost stop.

2.To set the upper limit switch, loosen the clamping knob on the limit switch support bracket. Move the limit switch to the desired switch trip point (use the scale on the side of the support bracket).

Lower Limit Switch

Switch Follower

Lower Limit Stop

Jam Nut

Figure 15: Lower Limit Switch Stop 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.

Lubrication

Lubricate the following components at the specified frequencies and using the lubricants defined below:

1.Ball bearings: the bearings are lubricated and sealed—periodic lubrication is not required.

2.Blade guide bearing: the bearings are lubricated and sealed—lubrication is not required. Inspect periodically.

3.Idler wheel bushing: the bearings are lubricated and sealed—lubrication is not required. Inspect periodically.

4.Lead screw bearing housing: lubricate monthly

(see exploded figure, page 20).

5.Lead screw: lubricate with light oil monthly (see exploded figure, page 20).

6.Hydraulic cylinder pivot: lubricate with light oil every 6 months (see exploded figure, page 20).

7.Blade tension screw: lubricate with grease every 6 months (see exploded figure, page 24).

8.Blade brush bearing: lubricate with light oil monthly (see exploded figure, page 24).

9.Gear box: check oil once a year.

10.Change coolant on a frequency appropriate to the type of coolant being used. Oil based coolants can sour. Refer to the coolant supplier’s instructions for change frequency.

11.Coolant tank: clean every 6 months or as re- quired.

12.Hydraulic oil reservoir: check oil level in oil reservoir by periodically checking the oil level indicator on the side of the reservoir. If oil level is low, service reservoir (refer to Servicing Hydraulic Oil).