Published an enhancement for the current test jig: a ratcheting drum on the intermediate gear.
Mathieu Glachant
http://www.thingiverse.com/thing:17411
It should be a drop in for gear number 2, the one between the hour and
minute gear that currently has a fixed drum built into it... but it is
quite a bit thicker, so it may not fit your existing clock case.
Hopefully I didn't leave any boneheaded mistakes in there and it
should just work.
It's basically the old ratcheting drum design, with a pinion gear
mounted on top of the drum part, and with the option to switch whether
the ratchet allows clockwise or anticlockwise rotation.
The main downside of using this part is that when you rewind the
clock, any hands that are after the drum gear will move, since they
will rotate with the pinion gear of the drum. In this precise case, it
means that you have to rewind the clock by three full rotations of the
drum (i.e. a half day's worth of runtime) so that the hour hand comes
back to its original position.
Which reminds me, we need to switch from snap-fit hands to friction
fit hands that can be easily reset to whatever time we want...
Mathieu Glachant
The ratchet arms will bump into the spokes and not have enough room to bend out of the way of the teeth on the ratchet wheel... Need to fix that.
Tony Buser
Hi, Rob from the BotFarm here.
The RatchetArms file for gear 2 has not been successfully printed. The geometry of the file is failing somehow; despite being apparently solid in model view, the hub on the bottom of the gear prints hollow with no bottom layer. Please see the attached photo; you can see the bottom of a completed print, and the beginning layers of another print showing the empty hub.
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-- Rob
BotFarm
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Mathieu Glachant
except perhaps run the STL file thru that online file clean-up service
and see if that helps?
Hopefully, the current line of investigation on a simpler ratchet
design will yield fruit soon enough to scrap this part for the
clock...