A rolling machine , also known as a rounding machine or finishing machine , is a tool for reworking the cycloidal gear teeth .
The Swiss watchmaker and inventor Abraham-Louis Perrelet invented the rolling machine around 1800. At the end of the 19th century and especially at the beginning of the 20th century, the machine found widespread use among watchmakers, so that it was almost in the middle of the 20th century stood in every watchmaker's business. The rolling machine has now become a sought-after collector's item .
The horizontal milling spindle with a suitable milling cutter is driven by a flywheel with a hand crank. The gear ( workpiece ) is clamped in a holder ( quill ) so that it rotates freely perpendicular to the milling cutter . In order to be able to position the workpiece (gearwheel) exactly to the tool (milling cutter), the workpiece holder is attached to a three-axis slide . The whole machine can be mounted in a vice or on a specially built box in which milling cutters can be stored.
The individual milling cutters are only provided with a fine-toothed profile on about two thirds of the circumference . A smooth segment of the milling spindle, which is shaped as part of a screw thread , fits into the gap . It engages in the next tooth gap and rotates the freely rotating gear by one pitch during the subsequent generation so that the milling process can continue without interruption.
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- Wilhelm Schultz : The watchmaker at the workbench. Verlag der Deutschen Uhrmacherzeitung, 6th edition. Berlin 1920
- Rolling machine . In: Heinrich August Pierer , Julius Löbe (Hrsg.): Universal Lexicon of the Present and the Past . 4th edition. tape 18 . Altenburg 1864, p. 836 ( zeno.org ).
- Rounding Up Tool and Rounding Up Tool, c.1900-1920 in NAWCC (English)
- Video of a rolling machine . Retrieved November 1, 2013.
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