It appears I have run into a problem with my quiet cut spindle. It no longer starts spinning unless I get it a little spin with my hand to start it. After that, it appears that the spinning speed does not stay stable.
This is the case with a direct connect to the power supply as well as through the speed controller and using PWM from the tinyg.
In addition, when connected to the tinyg, any changes to the speed after it starts causing the spindle to stop.
This unit was working fine for the last few days.
Any thoughts on what this might be? If not, is there any type of warranty on the spindles?
Thank you in advance!
Bad news … Sounds like it overheated. Is it possible that it was feeding in to material too fast?
Are you sure your spindle power supply is still good, perhaps current limiting?
What are your tinyG PWM parameters (Enter $p1 command)?
When you turn the spindle by hand BEFORE using it (ie, when it is cold) do you feel any drag? But my thought is really more about damage to the internal cooling not warping
Kevin Hauser - I do feel a bit of drag. More like I can feel “slots” that might be the gearing of the motor? Is that normal? So, at any rate, I guess the spindles coming with these kits really do not have the torque needed. Any suggestions on an upgrade?
I was only cutting 1/8 6061 aluminum and had a cut depth of just .2 mm. In addition, used a vacuum to remove all chips directly and also lubed each pass. Oh well…
That doesn’t seem like an overload situation unless the feedrate was high (and I don’t know the correct feedrate, sorry). You might be feeling the magnetic attraction though. The suggestion about checking the power supply is also relevant … give it a go, but either thing being bad will set you back 
BTW I checked my spindle. When I rotate it I can feel the slightest opposition as it turns through the poles, but it’s not at all like a drag. It’s clearly magnetic attraction/opposition.