Their chart’s X axis is torque, and mine was speed (which is less confusing and more useful IMO). Their apparent improved efficiency with torque increase was likely caused by the ~12 Watts required to spin the motor without a load. Here’s a chart showing the equivalent range for the Nomad spindle after accounting for the 2.5 pulley ratio.
I believe Nomad’s speed range is 2000 - 10000 RPM, so here’s a chart showing a much broader speed range:
MRR is proportional to power, which is proportional to speed and torque. Force is proportional to torque and motor power losses/heating is proportional to torque squared. So, unlike speed, torque is not our friend.
Hmm, the first chart makes sense, it matches the original chart, just scaled a bit.
The second chart though is extrapolating. Do you have some scientific/mathematical basis upon which the extrapolation is based or did you just fit a curve?
Don’t get me wrong, it makes sense, going at a lower RPM is out of spec after all, but I’m not one to take a chart at face value.
My first chart shows the extrapolations. Torque is essentially linear from its minimum (0 at maximum speed) to its maximum (“stall torque” at 0 speed). The maximum power curve is a parabola centered at the midpoint of speed range.
@Julien, @will, others?. Should we move this (too far “into the weeds”?) discussion to private messages, or is there potential value in leaving it here or moving it to another thread?
This thread is about Nomad tweaks/mods so the motor discussion is in line with that as far as I am concerned, but if you would like me to fork the latest messages into a separate thread, just let me know
