Gear hangs when under pressure

[TGit-Tech]

Ran into a problem with the motors not being able to overcome the spike lift when the motor gear turns. Not to mention the jitter gotten from it which makes precision obsolete. As shown in the picture; when the gear turns each "point" of each gear will offset its standard position during rotation. When enough pressure is put on the gear it locks the rotation since it cannot over come the "lift".

I've also tried to print a herringbone gear as shown below; but this did not resolve the "lift" issue and also didn't print well. Tried to use sketch-up to round the herringbone gears more in a circle but it made quite a mess of the model. So the next approach will be to just add a circular ring on the outer edge to create a "bushing" type effect mesh between the rack and pinion.

[TGit-Tech]

The solution turned out to be a couple of things. I switched from the 'homemade' gear design to using Sketchup Plugin

jimhami42_rack_and_pinion.rbz

It can be found at https://sites.google.com/site/spirixcode/code

The rounded gears proved to provide better and tighter rotation - although even with this design the pressure points was still an issue ( much better - but still could use some work ).

Combining the new gearing from the plug-in and also adding a 2mm rolling edge turned out pretty good. For the time being it will be the solution to this issue.