Re: [CAD_CAM_EDM_DRO] Re: How to determine Torque from these motor numbers?

Earl wrote:

>Thanks for all the help and numbers so far yall. You dont know how
>much the helps out! :)
>
>these motors are around 4"D x 5"L in size.. I guess from what I'm
>hearing is that they are actaully more powerful than I thought?
>
>Lastly, Greg when you mention testing the motor for temperature
>buildup, Is it OK to let the motor cook at locked shaft.. even at (a
>low) 3.7A? just seems that cant be good on it for any length of
>time... but if thats what it takes! :)
>
>

Locked-rotor is the worst-case torture test, as there is no air motion
to help move heat from the armature to the housing. Even motors
with no internal fan will transfer heat a lot better from the armature
when it is spinning.

In general, mid-size machines should be able to null the servo amps
at less than 1 A. This may not hold for heavy quills, heads or knees,
however, where the motor is constantly fightning gravity. If the motor
overheats under these circumstances, you need to counterbalance the
load or change the gear ratio.

Jon