Center point
Centering points are mainly used on lathes to clamp long, slim workpieces. The spread between the tips reduces the deflection of the workpiece by the cutting forces and avoids the risk of hitting roving by unbalance .
In order to clamp a shaft with center points, the end faces of the workpiece must first be provided with center holes .
Center points are attached by Morse taper . A centering is rotationally rigid in the quill of the tailstock attached. The second center point is attached to the tool spindle. The rotary movement of the main spindle is transmitted to the workpiece by a drive plate and a rotary heart. Alternatively, face drivers with a built-in center point are used, which are pressed against the flat side of the workpiece.
Revolving center points are decoupled by a roller bearing and allow high speeds. Fixed center points run more precisely, but cause friction. Separating and cooling lubricants are used to avoid seizure caused by partial welding of the surfaces . Wear- inhibiting hard metal inserts are common.
Individual evidence
- ^ A b c Heinz Jung, Jörg-Peter Pahl, Werner Schröder: Specialist metal practice for vocational training and further education . 6th edition. Cornelsen, Berlin 1999, ISBN 3-464-42050-7 .
- ↑ Metal expertise . 56th edition. Europa-Lehrmittel, Haan-Gruiten 2010, ISBN 978-3-8085-1156-5 .