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| How do I measure the torque on a rotating shaft ? |
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| efrench:
I did a rather simpler test of a stepper motor by attaching a couple of 1-2-3 blocks to the end of a 6" arm. The holding torque (through a 9:1 gear reduction) for the stepper was rated at 828 oz-in. The motor had no problem rotating until it reached 5 rpm. The calculated dynamic torque was 211 oz-in when it failed. |
| BillTodd:
A bit late but... I would take two photo interupter discs ( think old time ball mouse technology) mount one to input shaft, one to output shaft with a torsion spring of suitable size between them. The torsion spring can be statically calibrated , just measure the angle realative while applying a known load over distance. To dynamically measure torque just time the difference between interupter pulses ( and count them the measure RPM) Bill |
| picclock:
Hi BillTodd That's exactly the approach I decided on. Its fairly trivial to use a processor to measure the angle of deflection using this technique. Am in the process of constructing the device now, so the sketch below is very much a work in progress. Best Regards picclock |
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