Junghans pocket watch setting-lever spring, last update 01.09.2019
Junghans > Parts
This is a try to reverse engineer the Junghans setting-lever springs for laser cutting. I used images made from a scan of the setting-lever spring as a backdrop in Fusion360 to create the part. The image was calibrated to a known measurement of the original setting-lever spring. To use the data on the laser machine you need a dxf file with a offset according to the machines specification. I this case the used laser cutter uses a 0,15 mm offset. The only remaning work after cutting is a countersink for the screw and a little deburring as a goal. I have not such a nice laser machine, but a friend does: www.knauf-design.de The first attempt are promising as you can see in the videos below. As the parts are mostly round everwhere some adjustments have to be done in the dxdf files. Version 2 will be shown next time.
Original spare part package from 1936
J9, J13, J15, J14
J26, J32, J33, J34
J47, J48, J49