Switching On The Automatic Feed; Working With The Tailstock; Selecting The Turning Tool; Inserting The Cutting Tool In The Tool Post - Proxxon PD 250/E Manual De Instrucciones

Switching on the automatic feed

Important
Only switch on the feed when the machine is stationary.
1. Turn the switch 1 (Fig. 6) to the right.
2. Turn the switch to the left to switch off the feed.
If stiff, slightly move the handwheel of the leadscrew.
Important
When the automatic feed is switched on, always ensure that
the support or turning tool do not collide with the lathe chuck
or tailstock.
When the automatic feed is switched on, the support is pushed
by 0.05 or 0.1 mm per turn depending on the gear combination.
Please note the sticker on the inside of the drive gearbox when
adjusting the feed.
The support always moves from right to left when the spindle is
turning normally (clockwise rotation) and the automatic feed is
switched on. This is also the normal feed when turning.
Of course, the support can also be moved back to the output
position automatically.
To do so, switch off the machine, slightly draw back the
turning tool and then set the switch 2 (Fig. 2) to anticlockwise
rotation.

Working with the tailstock

1. Release the clamp screw 4 (Fig. 7), push the tailstock 2 on
the guide into the required position and re-tighten the clamp
screw.
A mount is located on the sleeve for the drill chuck or rotating
centre with morse taper, size MK 1.
Important
Receiving tapers must always be perfectly clean.
Dirt, especially metal chips, affect the precision and can
render the sleeve and shank taper unusable.
2. To insert a tool, e.g. the centre 1 (Fig. 7), extend the sleeve
approx. 10 mm by turning the handwheel 3.
3. Firmly push the cone of the lathe center 1 (Fig. 7) by hand
into the spindle sleeve.
The cone is firmly seated and cannot be pulled out from the
front.
4. To release an inserted tool, turn handwheel 3 to the left to
stop.
5. Then turn approx. one further turn against the resistance.
The taper is released and can be removed.
The sleeve can be clamped in any position by tightening the
screw 5 (Fig. 7).
Note:
Note:
Note:

Selecting the turning tool

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" posi-
tion
• and is operated at the correct speed.
Inside turning tools (a) (Fig. 8)
• are used for interior diameter turning.
Cut-off tools (b)
• for plunge-cutting grooves and cutting off work pieces.
Thread tools (c)
• are used for cutting outer threads.
Finishing or tapering tools (d)
• are used to achieve a clean surface when removing small
chips.
Right side tools (e)
• is used to cut as many turning chips as possible in the right-
hand direction of processing regardless of the quality of the
work piece surface (so-called "rough-cutting").
Left side tools (f)
• are used to remove as many chips as possible in a short
time when machining towards the left, regardless of the sur-
face quality of the work piece.
Insert the cutting tool in the tool post
1. Unscrew both fastening screws 1 (Fig. 9) until the selected
turning tool 3 fits into the mount.
Important
Give the turning tool as short an overhang as possible. Allow-
ing the tool to project too far leads to vibrations,
imprecision and an unclean surface.
2. Insert the turning tool 3 and tighten the fastening screws 1.
3. Move the turning tool to the centre 4 and check whether the
height has been correctly adjusted.
For height deviations, small metal sheets 2 (e.g. valve sensor
gauges) must be placed beneath the complete surface.
The tool holder provides the possibility of clamping two cutting
tools at the same time. This simplifies work, because after
adjusting the cutting tools between the individual machining
stages for a workpiece, it is only necessary to swivel the tool
holder in order to work with the respectively suitable tool.
To do so, simply loosen the Allen screw 5, swivel the tool hold-
er and then retighten the screw 5. Of course it is possible to
generally regulate the angle of the tool to the workpiece in this
manner, if required.
Note:
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