Turning Between Centres; Taper Turning With Tailstock; Taper Turning With Top Slide; Three Jaw Universal Chuck - Promac GHB-1330 Manuel Utilisateur

-Change gears (G) to match the feed and thread chart.
Adjust gears to mesh with upper and lower gear.
Placing ordinary paper in between gears helps to adjust for
correct gear spacing (... remove the paper afterwards!).
Close and lock the pulley cover.

7.2 Turning between centres

Mount the workpiece fitted with the drive dog between centres.
The driver is driven by the face plate (Fig 19).
Lubricate the tailstock centre with grease to prevent tip from
overheating.

7.3 Taper turning with tailstock

Turning up to a side angle of 5° can be achieved by off-setting
the tailstock.
Fig 18
Fig 19
To offset the tailstock, loosen the locking handle (I, Fig 8),
loosen the front adjusting screw (K) 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 work piece 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.

7.4 Taper turning with top slide

By angling the top slide, tapers may be turned.
Loosen 2 lock nuts (J, Fig 6) and rotate the top slide
according to the graduated scale.

7.5 Three jaw universal chuck

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

7.6 Four jaw independent chuck

(standard for GHB-1340A)
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.
12
Fig 20