Time-O-Matic Model 3 Sign Control Gear (+Cams)
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Recreation of the cam gear for a Time-O-Matic Model 3 mechanical flasher
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- Printables
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- Mechanical Parts
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- Creative Commons — Attribution — Share Alike
Recreation of the main cam assembly and gear for the Time-O-Matic neon sign controller. The original gear is wooden(?) and seems fragile. Mine had broken teeth. .STEP files included for easy modification to suit your needs, including a blank cam shape and an (untested but should work) recreation of the stock 50% duty cycle cam.
- Need 1x M3 4x4.2 heat set insert and M3 bolt to act as a set screw
Cam and gear are separate, put the insert in first and then use superglue to affix the cam to the main gear. The inner hole might need to be worked around the shaft or sanded.
You can also fine tune your min/max speed by adjusting the position of the coil's core and thus its range of motion.
If you want to mod your unit for controlling sirens such as the 3T22 or Thunderbolt 1003, I suggest printing fedsig_approximation.stl as that seems to give the most similar cycle rate to the original control panels' cam shape. It looks pretty similar too.
And if your speed control does not work properly, check out this small washer I made to solve the problem.