Turning Between Centres; Taper Turning With Top Slide; Three Jaw Universal Chuck; Four Jaw Independent Chuck - Promac BD-7 Operating Instructions Manual

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.
On the feed direction lever (R, Fig 2)
left or right hand thread can be
chosen.

7.2 Turning between centres

Mount the work piece fitted with the
drive dog between centres.
The driver is driven by the face plate
(Fig 12).
Fig 12
Lubricate the tailstock centre with
grease to prevent tip from
overheating.

7.3 Taper turning with top slide

By angling the top slide, tapers may
be turned.
Loosen two hex socket bolts (A, Fig
13) and rotate the top slide according
to the graduated scale.
Fig 13

7.4 Three jaw universal chuck

With this universal chuck, cylindrical,
triangular and hexagonal stock may
be clamped (Fig 14).
Fig 14
To hold big diameter stock, a set of
3 OD chuck jaws is supplied.
The jaws always need to be inserted
to the chuck in the correct order.
Use Molykote Paste G (or adequate
grease) to lubricate the jaws.

7.5 Four jaw independent chuck

(optional)
This chuck has four independently
adjustable chuck jaws (Fig 15).
These permit the holding of square
and asymmetrical pieces and enable
the accurate concentric set-up of
cylindrical pieces.
Fig 15
7.6 Live centre (optional)
The live centre is mounted in ball
bearings.
Its use is highly recommended for
speeds above 500 RPM.
6
Fig 16
To eject the live centre, fully retract
the tailstock quill.

7.7 Steady and follow rest

(optional)
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 knurled screws (3, Fig 17) so
that fingers (2) are snug but not tight
against work piece. Tighten nuts (1).
Lubricate the fingers to prevent
premature wear.
Fig 17
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 (Fig 18).