Does this sound normal?

[JAZZCNC]

Does that sound normal to you?

Oh, here we go again, I'm truly sorry to have to say this but for that particular machine then yes it's about right.!! That doesn't mean it's correct, it's very wrong.

The problem and the noises you are hearing won't be from one thing, it's a mixture of things. I have had plenty of experience with these machines bought from eBay and they are so badly engineered and constructed that a good percentage of the noise will be from poor alignment and setup of the ball-screws.

The next issue is that they are never set up regards motor tuning and micro-steps etc, don't know if you bought it directly from the guy in Peterlee or not but nearly everyone I've encountered hasn't come with Mach3 setup at all.

The third issue is that they use Nema 34 motors and often with a low voltage PSU which when combined with cheap drives or poorly setup drives they perform like a can of marbles due to resonance, this resonance is mostly what your hearing as the drives are either setup wrong regards micros steps or just not dealing with the resonance, which is also compounded by the poorly aligned and setup ball-screws. Resonance can and does cripple the performance of a machine and not to be underestimated.

The first port of call is to check what micro-steps are set on the drives.?
Do you know the voltage of the PSU feeding the drives.?

Is this using the UC100 controller.? ( This connects to the KK01 and goes to the PC)

I must also say that if I speed it up it almost eliminates that vibration noise but then it runs at a feed rate that would break bits.

What speed does it go away at.? Also, knowing these machines the reason they would break bits above 3mm diameter if cutting in wood's or MDF, etc is that they can not travel fast enough and the machine design is weak and poorly built which causes vibrations so together they can't reach the feed-rates to cut correctly.!

New users often believe it's their fault they are breaking cutters due to wrong feeds and speeds, often wrongly slowing down when they should be cutting faster. However, this machine in particular while being built from steel is so badly constructed, set up, and poorly specified then they are fighting a losing battle from the get-go.!

The reason for them not being able to reach the feeds is two-fold, 1st they only have 5mm pitch ball screws, and 2nd they have Nema 34 motors with low volts.
Large motors like Nema34 when run on low voltage don't spin very fast and the torque drops away very quickly when they are at higher rpm's, they struggle to reach much above 1000rpm and have any usable torque left if run on voltages lower than 60Vdc.
Combine this with a 5mm pitch and your maximum velocity is 5000 mm/min, which in practice would actually be more like 4500mm/min to avoid losing steps.
However, This would be your Rapid feed rate and wouldn't be of any use for cutting as the torque will be quite low. So your usable cutting velocity would be more in the range of 3500mm/min which simply isn't fast enough to cut most woods or MDF correctly with any tools above 3mm.
Combine this with the vibrations and flex from the machine and you are always going to break cutters and struggle to get a decent finish on the material, also tool wear will be excessive due to wrong cutting parameters causing excess heat.!

Again I'm very sorry to have to point these things out and these machines make my blood boil because I see people getting ripped off all the time with these poorly built, poorly specified, and set up machines with no support from the supplier and it's not fair.
However, I don't know how I can let people know what they have and are facing without being blunt and to the point informing them of what they have in front of them. We can help you regards setup etc and possibly getting it running a little better but the rest isn't anything we can help with other than to advise you to sell it rather than try to upgrade or improve it.