[compunerdy]

Mine makes some strange noises when moving at certain slow speeds as well.

[kevinro]

Mine makes a very similar noise at about 7-8 IPM on the Z axis. I think it is just a harmonic noise based on the frequency of steps. It doesn't make it at 5 or 10 ipm.

I would still talk to Tormach about it just in case, but I haven't had any issues other than it is a little loud.

[hall6ppc]

Yes the motor makes the sounds pretty much threw all reasonable feed ranges . I had the feed rate override at 190% (7.91 IPM) because thats was the feed in this particular program that is was the loudest at . I have noticed the noise becoming progressively louder over the last few weeks. Since I just received the mill about two weeks ago it has not been run much , I haven't cut anything on it yet . I will say that that sound is very loud ,more so than the x and y axis. Also x and y do not make the "crackling " sound . I will kept the forum posted on what Tormach says .

[TXFred]

I've been dealing with a similar situation on my new 1100. On mine, when moving upwards at 60IPM or faster, I get a nasty noise. Here's the video I made, showiung the mill jogging at rapid speed.

[ame=http://www.youtube.com/watch?v=iKGDiZ5k_Co]Tormach PCNC-1100 with Z axis noise. - YouTube[/ame]

Working with Tormach's engineers, we found a couple of issues.

The cylinder on top of the Z stepper is the brake. Place a wood block between the head and the table to support the head. Then unbolt the brake and see if there is grease on the tab that connects the stepper to the brake. If it's dry, add a dab of heavy grease. That will reduce the noise.

My Z stepper motor was loosely bolted into place. I loosened the shaft coupler, loosened the motor to let it center itself, tightened it down, and retightened the coupler.

Lastly, I wrote a program to jog the head through full travel 100 times. I ran this program 5 times with a shot of oil added each time I ran the program. This was done to break in the Z axis ways.
A wood block was placed on the table so that if the Z axis lost steps, it would not crash into the table.

All of these things helped reduce the noise, but it still is something of an issue. The last thing Tormach did was send me a manual crank for Z so I can crank it up and down by hand and feel for any roughness that might indicate a bad ballscrew or ballnut. I haven't gotten a chance to try this yet. It's on my to-do list.

As others have said, the Tormach will resonate when running around 10IPM. They all do that, so the solution is to not run at that feedrate.

I suggest writing a program that jogs the head up and down at different feedrates, so that you can find out when the problem happens. That will narrow down the possible causes.

Frederic

[hall6ppc]

Yep sounds exactly like mine. Talked with Tormach they said the same thing you did , check for no grease at the Z axis brake connection .

Stand by for more info ....

[hall6ppc]

Ok I disassembled the z axis stepper motor brake connection from the motor shaft . It had ZERO grease so I added grease, reassembled and I was amazed on how much quieter it was. Day and night difference I must say. Just hope this last and it's not something that has to be repeated .

[dbrija]

Ok I disassembled the z axis stepper motor brake connection from the motor shaft . It had ZERO grease so I added grease, reassembled and I was amazed on how much quieter it was. Day and night difference I must say. Just hope this last and it's not something that has to be repeated .

I went through the same thing. Its a QC issue that Tormach needs to address. The brake assembly needs greased at assembly but its not happening. Given the very fragile nature of the wiring connection for the brake solenoid its a bad thing to have all the owners tearing into the motor. Don't ask how I know how fragile.... got a replacement under warranty (not greased ).

BTW, try 10IPM, and you'll get the max "noise" as that is the natural resonant frequency of the stepper.