[Kevin Sevcik]

Free speed is the easiest condition to measure. Stall is the tough condition to measure, unless you don't like your motors. I note that McMaster has some high accuracy wrenches with top ends of 2,5,10, and 25 in-lbs, so you can probably decrease the voltage enough to avoid blowing the CIM and your power supply and get a few data points. The FP would be exceedingly interesting, as it tops out at 63 oz-in and 70A on 12V. 35A at 6V might be safe for it, as that's only 200W. So that's one data point around 32oz-in. And then you work down from there. The window lifts declare a stall of something like 100+ in-lb, but they've got such a huge error bar on the chart that I don't know why you'd bother even trying... You'd just be testing what makes worm gears more and less efficient.

Anyways, I suppose if you have a large amount of accurate torque wrenches laying about and a good 0-12V 0-50A adjustable power supply hanging about, then it'd be a doable project.... But if you have to buy all that stuff, it's going to be a multi-grand project. I'd just as soon go with the specs as written and de-rate them by whatever you like.