Centroid Community CNC Support Forum

i've eliminated 80% of the noise and oscillation by realizing that defender turned itself back on at some point. There was tremendous chaos caused just by having the firewall turned on. So that was a major rookie mistake but at least i caught it. I've since followed the Centroid video on turning off windows updates so that windows defender cant get turned back on again.

I also removed more of the noise and oscillation by disconnecting the DB25 cable from the dmm unit when i wrote new parameters to it.
If i left the cable connected, it wrote the new parameters but it included something else that ran constant interference causing the noise and oscillation from my motors.

So Once i disconnected the db25 cable from the DMM unit and wrote the new parameters again, this time it took the data transfer cleanly and there was hardly any noise and oscillation.

Acorn and the DMM unit don't like to be connected while i write new parameters. Is this another rookie mistake?

The guys at DMM suggested I increase my main gain and speed gains together in 20% increments until my drives stopped faulting from not enough output. I had to get to 40 main and 40 speed gain until the drives would stop faulting when I jogged at rapid 150 inches per min. But there's still some slight hum and howl. I figured I would tune that out in time.



Things were looking good and things began to get even better but just today I ran into a new road block so I'm looking for help again. Heres what happened:



my next step was to set the turns ratio. I used the formula that centroid provided and i got that extremely precise after running the math about six times, getting tighter tolerances each time, so I was all smiles that day.

Yesterday I added a touch plate, and i tested it while holding it in my hand. The router bit saw the plate and retracted. I set my tool reference with the touch plate and that worked. I input one end mill tool into the library for now.

I then set my part x,y zero and used the touch plate to touch off the Z zero for the part. It all looked good. My smile was now even bigger.

I ran a simple circle pocket file that i made in intercon and it behaved nicely at first but then failed on the z depth and was wanting to go to the depths of hell. I stopped it in time. Broke a half inch bit instantly but i didn't go through the part or spoil board, or bed.

Here's my new problem.

after cancelling the job, I just told the machine to go to home. It goes to home but now The motors on the Y axis howl and groan once again very loudly and will quickly go into fault. And like before, when one of the Y drives faults, the other one goes silky smooth for a moment or two and then it faults.

Windows defender isn't running in the background again, and I don't see anything running on the computer that could cause interference.

This new noise has happened since i crashed the bit into the plywood. It only cut into the plywood 1/4" inch before the bit broke but it was in rapid movement. It hadn't arrived at the slow plunge distance. but it wasn't much of a crash. I caught it in time.

The motors are definitely spinning opposite directions. I can see about a 3mm difference in gantry square but the gantry is 5' wide so i figured thats acurrate enough? it cant be the cause, no?

I re-tightened the belts. One seemed looser that the other. DMM said they like to see tight belts. but now I can notice rolling resistance in the belts now that i re-tightened. Is that too tight?

So Y axis is noisy and it faults. If i increase gains, I get noise. If I decrease grains down to 20-25, its beutiful and quiet, but eventually faults in slow or rapid jog.

here's the specs that worked before the crash. They wont work now.

Defender can run, provided you let CNCM.EXE in as an exception. That should not be the cause of your noise. In fact if Defender was truly the problem, you would not have connection to the Acorn from CNC12.

I constantly leave the DB25 connected to the DYN4 drives when using the DMM data cable. No issues.


Is the VFD powered up and running when you are moving the gantry? If so, try powering it off and see if the Gantry moves ok
I suspect you have EMI noise going on in your control cabinet.

Can we see the inside of your control cabient? Did you follow good CNC wiring practices? All grounds and drain wires are connected at one point, where the power ground comes into the cabinet?

WHICH Y axis drive faults? Slave or Master?

Things should not change arbitrarily. I am wondering how you are making out....

Marty

I agree with Marty, I've been able to make changes to the DMM drives without disconnecting the DB25 cables. Are you using the DB25 connection on Acorn for step and direction?

Did you purchase the DYN4 to Acorn cables from DMM?

Mine run smoother on 120v. Less noise/ resonating. On 240v mine would resonate inconsistently say at the end of a jog

Make sure none of your control wires are near any line or motor power wires. This was another problem I had, which could have been related to the first

I put the vfd before the line reactor. Only the Dyn4 drives are downstream of the line reactor and the individual filters. This also could have been a problem with the first

Good luck. Took me a few days. Oh and I had a bad connection between the Dyn4 cable and the acorn terminals. That was another time waster.