Intervention circle
A Depth Tools also setting circles called, is a watchmaker tool for removing the correct depth of engagement with gear shafts and transferring (marking) of the axis distance to the board.
description
The compass consists of two parallel, opposing pointed or hollow grains ( quills ), the distance between which can be regulated by an adjusting screw. The oversized hollow grains in the shape of a trumpet are used to hold thick cones, spring cores and square edges.
function
There should be as little friction loss as possible between the gears of a watch. If the engagement of the wheels is incorrect due to an incorrect center distance, this can lead to friction losses and thus to disturbances in the movement of the movement. The two wheels to be tested are clamped in the engagement circle and the engagement is adjusted to the optimum with the aid of the adjusting screw . The axis distance determined in this way can be transferred directly to the plates of the movement to check the bearing distances or can be marked out at the same time using the tips.
There are intervention circles in different sizes.
literature
- Theodore R. Crom: Horological shop tools, 1700 to 1900 ; Melrose, Florida 1980; ISBN 0-9604888-0-4
Web links
- watch-wiki: intervention circle
Individual evidence
- ↑ Lukas Stolberg: Lexicon of the pocket watch ; Carinthia Verlag; Klagenfurt 1995; ISBN 3-85378-423-2 ; P. 55.
- ^ Wilhelm Schultz : The watchmaker on the workbench. Verlag der Deutschen Uhrmacherzeitung, 6th edition. Berlin 1920, p. 61f.
- ↑ O. Böckle, W. Brauns: Textbook for the watchmaking trade ; Wilhelm Knapp; Halle (Saale) 1943, p. 212f.