Brian Law's woodenclocks-Remontoire Rig

this video will show the development steps taken to incorporate a remand wire into the next wooden clock design normal clock will have a weight which will drive an escape and directly through the gear train in a remand to our design the escapement is driven by a separate way which is in turn driven by the main gear train the advantage to the statement is that it sees a constant load that is not perfected by any errors in the gear train itself it also has the advantage of not causing the gear train to be continuously stopped and started with the attendant variations in frictional forces I made four rigs to test which would be the best way of building the remans run this first design uses a cord wrapped around the last gear in the Train and then around the escape in between we have suspended the escapement weight and the tension weight escapement weight drives the escapement until its weight touches on the bottom link which in turn lifts the latch holding back the gear train now free to move the gear train pulls the escapement weight back up until its latch stops further movement whilst this is happening the escapement weight is applying a constant load to the escapement with the winding action taking place between two ticks this rig was useful in as much that it showed the concept of work with the wooden box grantee escapement but it also showed that the accuracy would be quite poor the ladder chain rig is the first attempt to improve the accuracy by driving through two identical sprockets using a chain instead of a cord this prevented the slippage that caused the inaccuracies in the first rig but unfortunately the chain had a tendency to stick and stop the work work so is not really a viable solution however this rig incorporated a revised method for releasing the latch it used a finger mounted at the back of the escape wheel that release the latch once every revolution this was simpler than the Robin design used in the first rig and turned out to be more accurate you third rig uses a timing belt which works more smoothly than the chain but would have the same advantages of maintaining accuracy unfortunately the belt proved difficult to use without having a large tension weight to keep the teeth engaged with the pulley the trouble is that the belts have an inherent stiffness that the chains don't possess Neff will need more tension to overcome this and so this was not considered a suitable choice for the design you final rig uses a traditional grandfather clock chain and sprocket perhaps it should have been the first choice because not only did it work well and accurately it looks the part when used in olden so this is the arrangement that will be used in the next ring the chain used here has 33 links before perhaps as a little course in its movement so I may use a foreigner 42 links before in the actual clock

Channel: Brian Law

Views: 129,949

Keywords: Remontoire, wooden clocks, gears, CNC machining

Id: FIBXzdK0y7A

Length: 5min 43sec (343 seconds)

Published: Thu Oct 22 2015