Bedienungsanleitung Proxxon PD 250-E (Seite 11 von 26) (Englisch)

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Fitting change gears for thread cutting

Note:

The PROXXON Lathe PD 250/E offers Youthe possibillity to cut

metric threads. Youfind alabel on the inside of the cover of the

gearbox of the machine to get the desired gear combination. The

number of teeth is imprinted on all change gears. All required

change gears areincluded in delivery.

The PD 250/E is supplied with installed gear arm and the change

gear combination for the automatic feed of 0.05 mm/revolution. It

is only necessary to replace the change gears installed on the gear

arm for thread cutting.

For example, if cutting athread with apitch of 1.0 mm, the table

on the drive gearbox will show the following data:

W15-gear on the main spindle with 15 teeth. This gear is already

installed on the shaft and must not be replaced.

Z115-Z220-Intermediate gear for the toothed belt of the main

spindle with15 teeth and permanently linked gear for the leadscr-

ew with 20 teeth.

L20 -leadscrew gear with 20 teeth. Of course all operations to cut

ainch system based thread areanalogous to the described exam-

ple with the metric thread! Note the different units for the thread

pitch on the labels inside the gear box cover!

1. Release the clamp screw 1(Fig. 18) and tilt the gear arm (2)

slightly upwards to remove the toothed belt (4).

2. Remove the fastening screws (3 and 5) from the normal gears

for the automatic feed.

3. Fasten the change gear "Z1-Z2" with 15/20 teeth (Fig. 19) to

the gear arm (3) using the screw (2), pulley,reduction sleeve

and nut. Please observe: The change gear "Z1-Z2" runs freely

between pulley and sleeve.The washer prevents the toothed

belt from becoming detached from the gear"Z1".

4. Do not yet tighten the fastening screw nut (2) (off-centre

adjustment must still be possible).

5. Release the set screw (1), remove the change gear "L40" and

replace with the change gear "L20".

6. Please observe: The grain of the leadscrew change "L" must

always point to the lathe chuck. The set screw (1) must be

clamped onto the flattened part of the shaft.

7. To ensurethat thereissufficient play between the change

gears, always insert astrip of newspaper between the teeth

when pushing the change gears together.The thickness of the

newspaper should correspond to the required tooth play.

8. Push the axle of the change gear "Z1-Z2" onto the arm so that

it contacts the leadscrew gear "L" and then tighten the

fastening screw nut (2).

9. Position the short toothed belt for the connection between the

gears "W" and "Z1" on the main spindles.

10.

Push the gear arm (3) downwards and tighten the clamp screw (4).

Auseful hint:

erfect, good-quality thread can only be cut by using the top

slide. Advancing the thread tool is performed using the cross-slide

as described above.

However,this causes the top slide to shift by 0.025 mm to the left

and the same distance to the right.

The chip in the thread is thereforealways only removed from one side.

Once the full thread depth has been reached, afinal full cut is

made by advancing slightly.

Thread cutting with the turning tool

Important

Use the lowest speed when cutting threads and proceed with

utmost caution.

The automatic feed must remain switched on until completion of

the thread. Disengaging between individual steps renders further

work impossible.

Only switch over the motor switch once the lathe chuck has come

to acomplete standstill. Switching over immediately increases

wear and reduces the service life of the motor.

Note:

For the following operations, the work piece must be machined

completely and have the correct thread outer diameter.

It is advisable to work out achamfer at the beginning of the

thread. The thread turning tool must be clamped at an angle of 90°

exactly.

1. Clamp the work piece.

2. Switch offthe automatic feed and set the turning tool to the

starting position.

3. Switch on the machine 2(Fig. 20) (clockwise rotation).

4. Advance the turning tool on the cross-slide (1) and engage

feed (3).

5. Switch offthe machine when the required thread length has

been reached (2).

6. Move back the turning tool slightly with the cross-slide.

7. Move the support back to the output position. To do so, switch

over the turning direction of the main spindle.

8. Advance the turning tool and repeat the steps described above

until the required thread depth is reached.

Thread cutting using the top slide

Aperfect, good-quality thread can only be cut by using the top

slide (accessories).

Advancing the thread tool is performed using the cross-slide as

described above.

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