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The point I was trying to make is if you're trained and immersed in a certain way of thinking and doing things, it can be hard to shut that off even if you're not in a professional setting.

Sounds heat related because it happens consistently after running, then goes away and works fine after it has been shut off for a few minutes (cools).

I don't know these machines well enough to...

Engineering in practice ends up being a series of concessions whether it's designing parts, developing mfg processes, selecting equipment...an engineer would think about this logically and balance...

Space was a problem for me...my house has a detached 2 car garage and there is a breezeway that was converted into a third car garage.

My wife and I park in the detached garage, and our 'shop' is...

That's the thing, I cannot touch the motor for more than a second or so without being burned after it's been running for a while. I think that's actually normal. I think some of the heat may be...

Another update...

Looks like the brushless DC motor generally runs in the 140-150F range during a multi hour run. The head of the machine generally runs in the 110-130 F range. I am using...

Just to update, I have contacted Little Machine Shop and also done some reading online.

Looks like the general information I have seen is the spindle motor should be in the 140-200F range running...

Hi guys,

I have a CNC converted LMS 3990. I built the control system myself, changed over to 300in-oz holding torque steppers and ball screws, running GRBL, using Fusion 360 for CAM, have been...