Bedienungsanleitung Huvema HU 550 VARIO (Seite 19 von 32) (Englisch)

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CHANGES AND TYPING ERRORS RESERVED CHANGES AND TYPING ERRORS RESERVED

8.6. Thread cUTTinG

Figure 28 – Thread cutting

Set the machine to the desired thread pitch. Switch the machine on and close the half nut. When the tool reaches the

work piece, it will cut the initial threading pass. When the tool reaches the end of the cut, switch the machine off and

at the same time move the tool out of the cut. Do not open the half nut! Reverse the motor direction to make the

tool return to the starting point. Repeat these steps until the desired result is obtained.

Advice for thread cutting

• The work piece diameter must compare to the diameter of the required thread.

• The work piece requires a chamfer of 45º at the beginning of the thread and an undercut at the thread run out.

• Speed must be as low as possible.

• Use the right combination of change wheels and adjustments to obtain the required thread pitch.

• The thread cutting tool must be exactly the same shape as the thread, must be rectangular and clamped so that

it coincides exactly with the turning center.

• The thread is cut in steps so that the cutting tool has to be turned out of the thread completely (with the cross

slide) at the end of each cutting step.

• The tool is withdrawn with the half nut engaged by using the on/off switch.

• Switch the machine off. Feed the thread cutting tool in low cut depths using the cross slide.

• Before each passage, place the top slide approximately 0.02 to 0.03 mm to the left and right alternately in order

to cut the thread free. This way, the thread cutting tools cut only one thread flank with each passage. Keep

cutting the thread free until you have almost reached the full depth of thread.

9. accessories

9.1. 3-jaw chUck

This 3-jaw chuck can be used to clamp round, triangular, square, hexagonal. octagonal and twelve-cornered work

pieces.

Note!

New 3-jaw chucks have very tight fitting jaws. This is necessary to ensure accurate clamping

and long service life. With repeated opening and closing, the jaw adjust automatically and their

operation becomes smoother.

Note

The original 3-jaw chuck has been mounted with tow “0” marks (A, fig. 29) on the chuck and chuck

flange.

There are two types of jaws: internal and external jaws. Please note that the number of jaws matches the number

inside the chuck’s groove. When you are going to mount them, please mount them in the ascending order 1-2-3 (as

indicated on the jaws), dismounting takes place in the reverse order 3-2-1. After you have finished the procedure,

rotate the jaws to the smallest diameter and check that the three jaws are well fitted.

9.2. independenT 4-jaw chUck

This chuck has 4 independently adjustable jaws (fig. 30). These permit the holding of asymmetrical or cylindrical

pieces.

9.3. drill chUck (opTional)

Use the drill chuck to hold centering drills and twist drills in the tailstock (A, fig. 31).

9.4. arbor (opTional)

An arbor is necessary for mounting the drill chuck in the tailstock. It has a MT2 taper (B, fig. 31).

9.5. sTeady cenTer (opTional)

The steady center is mounted in ball bearings. Its use is highly recommended for turning at speeds in excess of 600

RPM (fig. 32).

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