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I can't seem to get it to run for more than about 3 ticks. Can anyone help?

I've started testing from the left:

  • Mainspring assembly works well
  • Gear train assembly works well. Low friction, no binding.
  • But I can't seem to keep the balance moving. Just 2 or 3 times and then it dies out.

My understanding of the physics of it is that: as a tick happens, the escape wheel needs to impart some energy to the pallet fork, which will transfer it to the balance by hitting the impact pin. That makes the balance swing out. Then because it's on the hairspring, the balance will come back with (hopefully) enough energy left to trigger the next tick.

So somewhere in there, I'm losing energy. Either:

  • Escape wheel isn't giving enough to the pallet fork
  • Pallet fork isn't giving enough to the balance
  • Balance is losing too much during its swing out and back in
  • Triggering the pallet fork / escape wheel to make the next tick is requiring more energy than it should

I've tried printing the balance with high infill, and I've tried printing the hairspring with 100% infill. Any more ideas?