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  #1  
Old Sun 18 February 2007, 10:29
Brian_B
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Will bevel (angled) gears be better?

Hi Gerald,

Has anyone given any thought to using helical rack and pinions? Supposedly less likely to skip a tooth and with better/more efficient power transmission. According to this company:

http://www.atlantadrives.com/racks.htm

they are no more expensive than normal straight racks (though I don't know, yet, what their "normal" pricing is!).

The main disadvantage is that they can be tricky to align and set up.

Brian
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Old Sun 18 February 2007, 23:29
Gerald_D
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Brian, we are not in the habit of skipping teeth with the straight rack, so we don't need improvements in that area. The springloaded pinion will have a smoother ride on a helical rack compared to a straight one.

But a helical rack introduces side forces, or an axial force on the pinion shaft. Most stepper motors have a lot of axial freeplay (temperature dependent) which will translate to backlash with a helical gear train. The oriental motor gearboxes also don't want axial forces on their shafts.
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