General > General Technical Chat

Determining rotational accuracy of a drive unit.

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NiHaoMike:

--- Quote from: nctnico on May 18, 2021, 08:35:22 pm ---Using gears together with stepper motors is a big no anyway because the stepper motor will wreck the gear teeth.

--- End quote ---
Care to explain why? It's not that difficult to find a machine that uses a stepper motor driving gears and they seem reliable enough.

Someone:

--- Quote from: NiHaoMike on May 19, 2021, 01:22:47 am ---
--- Quote from: nctnico on May 18, 2021, 08:35:22 pm ---Using gears together with stepper motors is a big no anyway because the stepper motor will wreck the gear teeth.
--- End quote ---
Care to explain why? It's not that difficult to find a machine that uses a stepper motor driving gears and they seem reliable enough.
--- End quote ---
This is a common misconception from experience of driving stepper motors without micro stepping. Its not stepper motors that are the problem, but a vibration inducing drive method (which could equally apply to most motion actuators).

amyk:
If you need no backlash at low to moderate loads, there are gearboxes that use a preload mechanism to do that (similar to the mechanism in a dial indicator.)

Benta:
As the OP hasn't come back with more information, all this is moot.

Puffie40:
The application is for a camera pan-tilt platform, so the load is constant.  The programmers noticed the positioning accuracy would constantly get worse the more it moved. I did some one-way position movement and noticed the drift was constantly increasing the further it moved from the start point.

 I've heard that stepper motors and gearboxes are bad for positional accuracy, but I also don't think not having any position feedback aside from some limit switches would help either :palm:

Because it is a supplier-provided component, I cant do any redesign, but I can write up a small report to explain why.

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