Thingiverse will be undergoing scheduled maintenance and will be unavailable from December 14 @11pm EST to December 15 @1am EST

Loading

MakerBot Print is our newest print-prepration software, which supports native CAD files and STL assemblies,
allows you to interact with all your printers via the Cloud, and many other exciting new features.

Download Now

Report as inappropriate

unfortunately, there are some disadvantages...

the pitch of the gear teeth must remain constant for everything to mesh correctly. The outcome is that a gear with fewer teeth has a smaller circumference. That creates a practical limit on the gear ratio in this situation.

I tried going to 6 or 8 teeth on the small gear (from 10). They did not mesh well with the track and the parts were pretty flimsy (all teeth, no hub).

I also looked at adding more teeth to the large gear. That worked well, but caused a different problem.

The only part of the track that matters for generating rewinds is the track below the small gear. This length determines how far the counterweight can be raised to store energy.

Adding teeth to the large gear increases it circumference. The larger circumference means the diameter is also larger. This moves the small gear towards the base of the stand. The length of track below the small gear becomes smaller as the gear moves down the stand. This reduces rewind length, offsetting the gain in rewind length you wanted to achieve by adding teeth in the first place.

The only solution is to increase the track length below the small gear by making the stand taller. BTW, making the stand taller without changing the gears also yields additional rewind, so why bother....

The last thing investigated was placing the gears above the cap. This resulted in an even taller stand as you must have quite a bit of channel above the small gear to stabilize the track at full extension. It also complicated the loading and unloading of spools.