Bedienungsanleitung Proxxon PD 250-E (Seite 10 von 26) (Englisch)

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Note:

The normal lathe chuck has three steel jaws, which areuniformly

adjusted and centreround work pieces automatically.

In the normal position, work pieces can be clamped up to adia-

meter of 27 mm. After turning the jaws, it is possible to clamp up

to adiameter of 75 mm.

Do not leave the wrench in the lathe chuck. Risk of injury.

Clamping alonger work piece which has been guided through the

spindle and is projecting to the left increases the risk of injury.In

this case, be particularly careful to ensurethat no objects are

caught in the rotating shaft. Protect this zone separately by fuse.

1. Turn the lathe chuck 2(Fig. 12) using the wrench (1) until the

work piece fits in the mount.

2. Clamp the work piece tightly and remove the wrench from the

chuck.

3. Check the running of the work piece and correct if necessary.

Turning the jaws of the lathe chuck

Remove mains plug.

Do not clamp work pieces with adiameter greater than 71 mm.

The clamping force of the jaws is then too small and the work

piece may become loose. Danger of accident.

Note:

Open the lathe chuck until the jaws arereleased from the chuck.

The jaws arenumbered.This occurs in the sequence 3, 2and 1.

2. Turn the jaws and first insert no. 3inone of the three guides

(Fig. 13).

3. Press jaw no. 3inthe direction of the lathe chuck centreand

simultaneously turnthe chuck wrench in the "clamp" direction.

4. When the thread worm (4) has gripped jaw no. 3, insert jaw

no. 2into the next guide (clockwise).

5. Repeat proceduredescribed above with nos. 2and 1.

6. Then check that all jaws areinthe central position.

7. If you want to work with the inside jaw chuck again, repeat the

steps described above in the reverse order,i.e. first insert jaw

nos. 1and 2, and then 3.

Longitudinal turning

Do not allow the support or turning tool to collide with the

lathe chuck.

Note:

1. Select the spindle speed according to the table on your lathe.

2. Adjust the required speed by shifting the belt in the drive gear-

box (see previous section).

3. Clamp aright side tool 2(Fig. 14) in the tool holder (see pre-

vious section).

4. Switch offthe automatic feed (3).

5. Move the support from the right to the left of the work piece.

6. Adjust the cutting depth using the crossslide (1).

7. Switch on the machine (clockwise rotation).

8. Manually feed or switch on the automatic feed (3), do not

overload the machine.

9. Beforeswitching on the machine, manually check whether the

spindle, chuck and work piece arerunning free.

Note:

If the top slide is not necessary,itisadvisable to clamp it with the

screw 4(Fig. 14). The turning performance is improved by elimina-

ting play.

Face turning

Important

The cutting speed from outside inwards differs considerably for

work pieces with larger diameters. Therefore, push the cross-

slide slowly and sensitively.

Note:

This method of working is used to turnoff the face of awork piece.

1. Adjust the right side tool by approx. 2° to 3° (Fig. 15).

2. Move the cross-slide from outside inwards (to the centre) with

the turning tool.

Taper turning

The top slide (Fig. 16) is equipped with ascale and can be swivel-

led by 45° on either side of zerofor taper turning. To do so, release

fastening screw (1), adjust top slide and then re tighten.

Cutting offawork piece

Important

Give the cutofftool as short an overhang as possible (half of the

diameter of the work piece +1mm). Similarly,give the work piece

as short an overhang as possible.

Note the exact centreheight of the cutofftool. Work at low

speeds and cool blade as often as possible.

1. Clamp the cutofftool at right angles in the tool holder.

2. Sensitively move the crossslide from outside inwards (to the

centre) with the turning tool. Machining longer work pieces with

tail stock and centre

Machining longer work pieces with

tailstock and centre

If the chuck projection is greater than three times the diameter of

the work piece, the work piece must be held at the right end by

the tailstock and centre.

For this purpose, acentreboremust be drilled on the right side of

the work piece.

1. Face turnthe right face.

2. Insert the drill chuck (accessories) in the tailstock and clamp

the centring drill.

3. Move the tailstock with drill chuck and centring drill up to the

face of the work piece.

4. Switch on the machine and drill centreboreusing the sleeve

feed.

5. Replace the drill chuck with the rotating centre1(Fig. 17).

6. Insert the centreinthe centreboreand clamp the tailstock (3)

securely.

7. Advance the sleeve (2) until all play is eliminated.

8. Securethe sleeve using aset screw (4).

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