Clamping In The Lathe Chuck; Machining Longer Work Pieces With Tailstock And Lathe Centre - Proxxon PD 400 CNC-ready Commissioning Manual

8.4. Clamping in the lathe chuck

Caution!
Please comply with the enclosed operating
instructions of the chuck manufacturer as
necessary!
Caution!
If work pieces are only clamped in the lathe
chuck without counter-bracket by the tailstock,
the projection may not be greater than the
three-fold diameter of the material (L = 3 x D),
see figure at right.

8.5. Machining longer work pieces with tailstock and lathe centre

Longer work pieces (chuck projection
greater than the 3-fold work piece
diameter) must be held at the right end by
the tailstock and the travelling lathe
centre. To do so, please affix a centring
hole on the right side:
1. Carefully face turn the right face side.
2. Insert drill chuck 1 (picture right) in
the tailstock and clamp the centring
drill.
3. Move the tailstock up to the work
piece and fix with clamping screw 2.
4. Switch on the machine and create
the centring hole using the sleeve
feed (hand wheel 4).
You can now replace the drill chuck with
the travelling lathe centre. Place the
centre in the centring hole and carefully
infeed until there is absolutely no play.
Now fix the sleeve with toggle 3.
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