Manual Proxxon PD 250-E (page 9 of 26) (English)

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1. Release the clamp screw 4(Fig. 7), push the tailstock (2) on the

guide into the required position and retighten the clamp screw.

2. To insert atool, e.g. the centre1(Fig. 7), extend the sleeve

approx. 10 mm by turning the handwheel 3.

3. Insert the centre1(Fig. 7) and shank taper firmly into the sleeve

by hand. The shank taper is secureand cannot be removed

from the front.

4. To release an inserted tool, turnhandwheel (3) to the left to

stop.

5. Then turnapprox. one further turnagainst the resistance. The

taper is released and can be removed.

6. The sleeve can be clamped in any position by tightening the

screw 5(Fig. 7).

Selecting the turning tool

Warning

Use only accessories recommended for this lathe. Follow the

instructions that accompany accessories. Use of improper acces-

sories may cause hazards.

For your own safety,use only lathe cutters sized and recommended

for this lathe. Follow the instructions that accompany the cutters.

Important

For proper turning, it is essential that:

•the correct turning tool has been selected for the appropriate

purpose

•the blade of the turning tool is sharp

•the blade of the turning tool sits exactly in the "centre" position

•and is operated at the correct speed.

Inside turning tools (a) (Fig. 8)

•are used for interior diameter turning.

Cutofftools (b)

•for plungecutting grooves and cutting offwork pieces.

Thread tools (c)

•are used for cutting outer threads. Finishing or tapering tools (d)

•are used to achieve aclean surface when removing small chips.

Right side tools (e)

•are used to remove as many chips as possible in ashort time

when machining towards the right, regardless of the surface

quality of the work piece.

Left side tools (f)

•are used to remove as many chips as possible in ashort time

when machining towards the left, regardless of the surface qua-

lity of the work piece.

Inserting the turning tool in the tool holder

Important

Give the turning tool as short an overhang as possible. Allowing

the tool to project too far leads to vibrations, imprecision and an

unclean surface.

1. Unscrew both fastening screws 1(Fig. 9) until the selected tur-

ning tool (3) fits into the mount.

2. Give the turning tool as short an overhang as possible. Allowing

the tool to project too far leads to vibrations, imprecision and

an unclean surface.

3. Insert the turning tool (3) and tighten the fastening screws (1).

4. Move the turning tool to the centre(4) and check whether the

height has been correctly adjusted.

Note:

For height deviations, small metal sheets (2) (e.g. valve sensor

gauges) must be placed beneath the complete surface.

Setting the spindle speeds

Important

Always disconnect the mains plug beforeworking on the drive

gearbox. Risk of injury.

The spindle speed must be adjusted to suit the work piece

material and diameter.

Calculating the maximum spindle speed

The required spindle speed can be calculated when the specified

maximum cutting speed for acertain material is known.

Maximum permissible spindle speed

Cutting speed x1000

Working piece diameter x3.14

Example:

Awork piece with adiameter of 20 mm is to be turned at acutting

speed of 50 rpm.

50 x1000 =796/min

20 x3.14

By shifting the V-belt (Fig. 10), set to the next highest speed. In

this case, the speed is 1600 rpm. The correct speed is now set via

the controls, and hereisimportant to note that the controls cover

aspeed range of 25% to 100%, i.e. in our example, 400 rpm to

1600 rpm.

1. Release the clamp screw from the drive gearbox and open the

flap.

2. Release Vbelt tensioner 1(Fig. 10).

Adjust the relevant speed by shifting the Vbelt according to Fig. 11

4. Retighten Vbelt tensioner.Note the appropriate tension of the

Vbelt. Overtensioning increases the wear of the belt and

bearing and reduces the motor power.

5. Close the drive gearbox beforecommencing turning work.

Clamping the work piece in the lathe chuck

Warning

To avoid injury from accidental start, make surethe switch is in the

OFF position and the plug is not connected to the power source

receptacle beforechanging any parts or tools (i. e. cutter).

Important

If work pieces areclamped in the lathe chuck using the tail stock

without asteady,the projection (Fig. 12) must not be greater than

three times the diameter of the material (L =3xD).

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Proxxon PD 250-E Manual

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