Re: measuring torque

Posted by Steve - IN on January 19, 2003 at 21:37:43 from (12.222.17.160):

In Reply to: measuring torque posted by puller on January 19, 2003 at 17:55:09:

puller,

The wise guy answer is: with a torque wrench. I'd guess you're probably talking about engines, though, so the answer is a dyno. If you're asking how a dyno works, there are a few different answers because there are a few different types of dynos.

The first types were basically brakes - you had the engine turn something looking like a big brake drum, then see how much force the engine could apply when the brake was "on". Another type hooked the flywheel of the engine to an oil or water pump -- and you could see the power rise as the fluid level went up on a thermometer type device. This method has some problems - one of which is having to keep big tanks of oil or water around. Another problem is that they were best at peak readings, and not steady RPM readings. So a more convenient, more portable, and easier to make accurate way to do it is to have the engine drive a DC generator, or an eddy current brake. Then you can measure the torque by reading the amount of electricity generated, or the amount of electricity needed to hold back the brake. These types easily lend themselves to computer control and logging, which makes the whole process go a lot quicker and easier.

Steve

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