Torque-speed metering device
Torque-speed metering device
(OP)
Hello,
I'm looking for a device with which I can measure the required torque at various rpm's. This way I could map the torque/rpm graph of various machines.
Is there some device for sale that can do this?
Thanks, Daan Haeyen
I'm looking for a device with which I can measure the required torque at various rpm's. This way I could map the torque/rpm graph of various machines.
Is there some device for sale that can do this?
Thanks, Daan Haeyen






RE: Torque-speed metering device
Gunnar Englund
www.gke.org
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Half full - Half empty? I don't mind. It's what in it that counts.
RE: Torque-speed metering device
RE: Torque-speed metering device
Gunnar Englund
www.gke.org
--------------------------------------
Half full - Half empty? I don't mind. It's what in it that counts.
RE: Torque-speed metering device
A colleague of mine had the suggestion to take a battery drill and just measure the current to the motor and the current, and determine the speed and torque with that.
RE: Torque-speed metering device
Gunnar Englund
www.gke.org
--------------------------------------
Half full - Half empty? I don't mind. It's what in it that counts.
RE: Torque-speed metering device
Gunnar Englund
www.gke.org
--------------------------------------
Half full - Half empty? I don't mind. It's what in it that counts.
RE: Torque-speed metering device
"You measure the size of the accomplishment by the obstacles you had to overcome to reach your goals" -- Booker T. Washington
RE: Torque-speed metering device
RE: Torque-speed metering device
and
A colleague of mine had the suggestion to take a battery drill and just measure the current to the motor
These statements may not be compatible.
29.5 Ft lbs is pretty high torque for a battery drill.
When you find a suitable motor you may just mount it on a pivot and measure the reaction with a spring scale.
Not the best accuracy but +- 5% should be no problem.
http://www.ebay.com/itm/NIB-Delta-Hanging-Weighing...
Or, if you need more capacity:
http://www.ebay.com/itm/Vintage-Chatillon-100-lb-H...
Bill
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"Why not the best?"
Jimmy Carter
RE: Torque-speed metering device
We'll see...
Gunnar, how does that device of you work?
RE: Torque-speed metering device
It is mostly being used to demonstrate electrical discharge in Deep groove ball bearings at different speeds and temperatures and with different oil/grease qualities. But it is also used to show rolling friction when a bearing has been damaged by EDM. To that end, a DC current transducer is used to measure motor armature current and feeds one of the inputs in the PicoScope unit at the bottom. A temperature transducer (I use an NTC with scaling and linearization in the PicoScope) and whatever other things I need to measure are connected to other inputs.
The DC motor to the right (shaft and chuck visible only) is an old ElectroCraft 24 V motor with a very constant Nm/A (torque/current) relationship so I can measure friction in the bearings with good enough accuracy. I use only one belt and one bearing for those tests.
Gunnar Englund
www.gke.org
--------------------------------------
Half full - Half empty? I don't mind. It's what in it that counts.