WatchTech

A David Walter Double Pendulum Clock – Part 3, The Suspension David Walter's new double pendulum perpetual calendar clock is advancing every day. For those of you who didn't see the earlier installments of this series, you can catch up by looking here: - ...  

Very interesting journey to follow! :) Looking forward to more! Best Blomman

Thanks Don and David for the update. Is the lathe knurling process done in one pass or more? Instintively, I guess in one pass for crisp cuts but the forces required must be huge. Multiple passes would nibble away but the precision required in X-Y-Z axes ...  

Knurled in a single pass and quite a lot of pressure is required for a clean knurl,it is done at a fairly slow speed of 260 rpm when done correctly it is quite fast, taking perhaps about 10-15 seconds. You got it ! Fitting a square peg into a round hole c... 

A bit ashamed, I've been following these posts of David's clock avidly from the beginning, but felt so many complex questions coming on, I wanted to wait a while before asking anything. Of all the clocks I have seen and studied in the world, David's after... 

how long the original design took, quite while as I recall. Breguet softened the suspension by removing material making the support slightly felxible, I saw problems with this concept and created a support as "soft" and flexible as possble allowing me to ...