Pivot wheelchair

A Pivot burnishing chair (also Pivot burnishing device ) is a device from the watchmaking that the smoothing and polishing of pin is used for. B. in shafts of wheels and drives .

properties

The polish reduces the frictional resistance of a pin in the jewel, thus extending the power reserve and improving the watch's performance. Due to the accumulation of dirt in the movement and the aging of the watch oil , the pins are partially abraded and provided with grooves .

Minor damage to the tenons can be removed with the pin wheelchair. The polish in the tenon roller wheel chair brings a tenon into a smaller, but round and smooth shape. Due to the material removal during roller burnishing, a bearing block with a smaller hole may be required later.

principle

The pin roller chair consists of a main roller tool and various attachments ( brooches ) and can be driven with a bow by hand or with a motor . The end of the shaft of a gear wheel opposite the journal to be machined is clamped into the main roller-wheeling device. The pin to be processed is placed in a brooch as a holder, the recess of which is smaller than the final diameter of the pin after polishing. The final diameter of the pin is determined with a polishing wheel and a micrometer. In the case of a motor-driven tenon roller wheel chair, the wheel and the polishing wheel turn in opposite directions, while in manual operation the polishing file (synonymous with roller burnishing file ) is used stationary or with a to-and-fro movement.

literature

Otto Böckle, Wilhelm Brauns: Textbook for the watchmaking trade. Work skills and materials. 8-10 Edition. Wilhelm Knapp, Halle (Saale) 1951 (reprint, edited by Michael Stern. Heel, Königswinter 2010, ISBN 978-3-86852-288-4 ).
Hermann Brinkmann: Introduction to watchmaking (= The watchmaking school. Vol. 2). 10th unchanged edition. Wilhelm Knapp, Düsseldorf 2005, ISBN 3-87420-010-8 .
George Daniels : Watchmaking. Updated 2011 edition. Philip Wilson Publishers, London 2011, ISBN 978-0-85667-704-5 .

Individual evidence

↑ Georges-Albert Berner: Illustrated specialist dictionary of watchmaking. (electronic version). Keyword rolling. Retrieved January 8, 2014.
↑ Georges-Albert Berner: Illustrated specialist dictionary of watchmaking. (electronic version). Keyword roller file. Retrieved January 8, 2014.

[1] Georges-Albert Berner: Illustrated specialist dictionary of watchmaking. (electronic version). Keyword rolling. Retrieved January 8, 2014.

[2] Georges-Albert Berner: Illustrated specialist dictionary of watchmaking. (electronic version). Keyword roller file. Retrieved January 8, 2014.