Harbor Freight Tools 43681 manual Tool Post

Fig.10 Threading Dial.

The Threading Dial

When the threads on the lead screw and on the workpiece are not in an integer ratio, it is necessary to use the thread- ing dial to control successive cuts. Determine this ratio by dividing the desired TPI of the workpiece (for example 24 TPI) by the thread pitch of the lead screw (8 TPI). This example results in an integer ratio of 3:1. A desired thread pitch of 26 TPI (for example) on the workpiece would require use of the threading dial.

1.When the threads on the workpiece are not in an in- teger proportion to the threads on the lead screw, it is necessary to operate the half nut intermittently. This is controlled by using the threading dial.

2.The Threading Dial (W) is located on the right side of the apron.

3.The dial is marked with four numbered lines, 1, 2, 3, and 4. Between each numbered line is an unnumbered line. On the dial there is also a fixed reference line.

4.When the threading dial is engaged with the lead screw, the dial will rotate.

5.There is an instruction plate attached to the threading

dial explaining the use of the dial, depending on the specific thread you are cutting.

6.For thread cutting, engage the half nut at the appropriate numbers shown on the thread- ing dial. 1-4 means the half nut can be engaged at any of the numbered lines 1, 2, 3, or 4. For successive cuts, only numbered lines must be used. 1-3 / 2-4 on the scale means that the half nut can only be engaged on 1 and 3 or 2 and 4 for successive cuts. For example, if you engage the half nut on “1” on the first cut, you can only engage it on “1” or “3” on following cuts. If you engage it on “2” on the first cut, you can only engage it on “2” and “4” on successive cuts.

7.1-8 means the half nut cannot be engaged on any lines, numbered or unnumbered.

8.If the half-nut is engaged throughout the initial cut, there is no need to use the thread- ing dial. Simply disengage the half nut, back the tool to the starting point, reengage the half nut and start over.

Four-Position Tool Rest

The four position tool rest can be used to hold up to four tools. It is controlled by the three handwheels on the Apron, the Saddle Handwheel (AA), the Cross Slide Handwheel (Z) and the Compound Slide Handwheel

(N).

1.	Tools are held in place on each side of the tool holder
	by two or three of the bolts on that side. Tools must fit
	into the tool groove.	Fig.11 Tool Post.
2.	When installing tools, check to see that the cutting
	edge is properly aligned with the rotating direction of the workpiece.
3.	The tool post can be rotated by loosening the Tool Post Clamping Lever (M), rotating
	the tool post, and retightening the lever.

SKU 43681 For technical questions, please call 1-800-444-3353. Page 11