Time setting issues: possible interference
Hi Steve,
I am building a SP10, and I am seeing an interference issue when I try to adjust the time. It was not easy to see where it is interfering, but what appears to happen is that the little ribs on gear5_30 fall into the gear that meshes with gear5_15. I believe that is 6_25_8. I wonder if you have seen this. Possibly an error on my part. See attached video.
I have tried re-assembling a few times, and it is always there. Now I am trying out some variations on gear5_30 to eliminate this, but then I do see some slippage: while the second hand looks correct, the clock appears to run slowly. So is why I am thinking there is some slippage. I moved the shaft collar to get more spring force as a test, and that appears to be working.
I am going to try a few more things on the pair 5_30 and 5_30 to keep away from the mating gear and get more friction while being able to keep the shaft collar and spring at the design location. One idea is a coupler/o-ring out of Cheetah between the 5_15 and 5_30. A purchased o-ring would probably work as well.
I will let you know how I make out...but mainly I am wondering if you have run across this.
Best and thanks for your amazing designs and help,
Dave Pechter
Hi Dave,
I am not completely sure what is happening, but it looks like gear6_25_8 is interfering with the ribs on gear5_30.
On my clock, gear6_25_8 meshes close to the front of gear5_15, so it has plenty of clearance away from the ribs on gear5_30.
Try testing for end shake on both arbors. Push gear5 backwards and pull gear6 forwards. There should only be 1-2mm of end shake on each arbor. If it is much larger than 2mm, then the gears may be moving too much and causing interference with gears they are not supposed to mesh with. See if you can move the gears around by adding spacers to prevent the interference.
Steve