Taper Turning With Tailstock; Taper Turning With Top Slide; Three Jaw Universal Chuck; Four Jaw Independent Chuck - Promac GH-1640ZX Operating Instructions Manual

Fig 18

7.2 Taper turning with tailstock

Turning up to a side angle of 5° can
be achieved by off-setting the
tailstock.
Fig 19
To offset the tailstock, loosen the
locking handle (A, Fig 19), loosen the
front adjusting screw (B) and take up
the same amount on the rear
adjusting screw.
Tighten the adjusting screws and the
locking nut to hold the tailstock in
position.
The workpiece must be held
between centres and driven by the
face plate and drive dog.
After taper turning, the tailstock must
be returned to its original position.
Turn a test piece and adjust until the
machine turns a perfect cylinder.

7.3 Taper turning with top slide

By angling the top slide, tapers may
be turned.
Loosen two nuts (B, Fig 15) and
rotate the top slide according to the
graduated scale.

7.4 Three jaw universal chuck

With this universal chuck, cylindrical,
triangular and hexagonal stock may
be clamped (Fig 20).
Fig 20
To hold big diameter stock, reverse
the top jaws.
Use Molykote Paste G (or adequate
grease) to lubricate the jaws.

7.5 Four jaw independent chuck

This chuck has four independently
adjustable chuck jaws. These permit
the holding of square and
asymmetrical pieces and enable the
accurate concentric set-up of
cylindrical pieces.

7.6 Live centre

The live centre is mounted in ball
bearings.
Its use is highly recommended for
speeds above 500 RPM.
To eject the live centre, fully retract
the tailstock quill.

7.7 Steady and follow rest

The steady rest
serves as a support for longer shafts
and ensures a safe and chatter free
operation.
The steady rest is mounted on the
bed way with a locking plate.
Tighten the fingers so that they are
snug but not tight against work piece.
Lubricate the fingers to prevent
premature wear.
The follow rest
is mounted on the saddle and follows
the movement of the tool. It prevents
flexing of long and thin work pieces
under pressure from the tool.
Set the fingers snug but not overly
tight. Lubricate the fingers to prevent
premature wear.

7.8 Bed gap removal

Pull the taper pins (A, Fig 21) by
tightening the hex nuts.
7
Remove the screws (B).
Bed gap can now be removed.
Fig 21
Before you install the bed gap, clean
the contacting surfaces thoroughly.
Remove nuts form the taper pins.
Slide taper pins into the holes and
seat using a mallet.
Tighten the screws.

8. Maintenance and inspection

General notes:
Maintenance, cleaning and repair
work may only be carried out after
the machine is protected against
accidental starting.
Turn off the main switch and
press the emergency stop button.
Clean the machine regularly.
Defective safety devices must be
replaced immediately.
Repair and maintenance work on the
electrical system may only be carried
out by a qualified electrician.

8.1 Annual Lubrication

- Headstock:
Change the hydraulic oil
(GH 1640 ZX....8 Liter)
(GH 1840/ 1860/ 1880 ZX....12Liter)
DIN 51517-2 CL ISO VG 32
(e.g. BP Energol HLP32, Castrol
Hyspin AWS 32, Mobil DTE Oil Light )
Oil must be up to indicator mark in oil
sight glass (A, Fig 22).
Fill oil by pulling plug located on top
of the headstock underneath the
rubber mat.