Originally Posted by gleas  More like mushy torque. If you grab the spindle at the lowest rpm, it will slow down but then recover it's speed. In any event, not a plus.
-Greg |
i think thats a motor controller / tach fault. if you hold the spindle, it will keep increasing current til it reaches peak torque. but its doing so very very slowly because its not getting feedback in a timely manner. it should be a more instant response - especially for tapping. youd need a tach that has more than a few counts per turn - probably a few hundred for super low speed stuff.
you arent meant to be using the peak torque (over 100% load) for things like that though.
in any case, you would set up a tachometer for mach to read the true speed of the spindle, and it can be made to vary the feed rate to match. this is how turning operations like threading work as well... which you can also do in the mill spindle.
i havent gotton that far yet though, so i dont know where all the settings are.