Taper Turning With Tailstock; Taper Turning With Top Slide; Three Jaw Universal Chuck; Four Jaw Independent Chuck - Promac PBD-2870 Manuel D'utilisation

8.3 Taper turning with tailstock

Mount the work piece fitted with the drive dog between
centres. The drive dog is driven by the face plate.
Lubricate the tailstock centre with grease to prevent tip from
overheating.
Figure 8-3: Taper turning between centres
To turn a taper, offset the tailstock, loosen the locking screws
(Z, Fig 8-3) and use screws (Y) to adjust.
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.

8.4 Taper turning with top slide

By angling the top slide, tapers may be turned.
Loosen two hex nuts (A, Fig 8-4) and rotate the top slide
according to the graduated scale (B).
Figure 8-4: Taper turning with top slide

8.5 Three jaw universal chuck

With this universal chuck, cylindrical, triangular and hexagonal
stock may be clamped (Fig 8-5).
Figure 8-5: Three jaw universal chuck
To hold big diameter stock, a set of OD chuck jaws is supplied.
The jaws need to be inserted to the chuck in the correct order.
Use Molykote Paste G (or adequate grease) to lubricate the
jaws.
8.6 Four jaw independent chuck (Optional)
This chuck has four independently adjustable chuck jaws (Fig
8-6).
These permit the holding of square and asymmetrical pieces
and enables accurate concentric set-up of cylindrical pieces.
Figure 8-6: Four jaw independent chuck

8.7 Live centre

The live centre (Fig 8-7) is mounted in ball bearings.
Its use is highly recommended for speeds above 500 RPM.
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