Ebay Chinese Routers (CNC3040) - anyone purchased one of these machines recently?

[Philly]

I would also be interested in someone who has actually bought one and what they got.

The adverts are way out of context, some say high speed water cooled spindle but show brushed motors, some say inverters but show a set of brushes.
I'm quite prepared to buy one and have to mess with it like a new controller instead of something that doesn't seem to have any support or spares but I'd like to know just what is liable to drop thru the door.

I have the 3040 and Im happy with it, it has no problems with Al. Its a brushed motor and its a nice little machine for the price. I'll see if I have any vids of it in action.

[camhguh]

Thanks Philly, does it come with any software?

[mugginsjm]

I have the 3040 and Im happy with it, it has no problems with Al. Its a brushed motor and its a nice little machine for the price. I'll see if I have any vids of it in action.

Hi
I'm new to the forum and to CNC. I've just taken delivery of a rather battered CNC3040. Can you tell me if it is normal for the X and Y axis motors to be very stiff to turn by hand. The Z is quite free. I've powered it all up and Z runs fine. The other 2 motors just make a humming noise. I've reconfigured the pins to drive X with known good channel Z but it still won't run. Do I suspect motors, wiring or warped drive chain. I will attempt to get a replacement but am not holding my breath.
Any guidance appreciated.
thanks
John

[JAZZCNC]

Hi
I'm new to the forum and to CNC. I've just taken delivery of a rather battered CNC3040. Can you tell me if it is normal for the X and Y axis motors to be very stiff to turn by hand. The Z is quite free. I've powered it all up and Z runs fine. The other 2 motors just make a humming noise. I've reconfigured the pins to drive X with known good channel Z but it still won't run. Do I suspect motors, wiring or warped drive chain. I will attempt to get a replacement but am not holding my breath.
Any guidance appreciated.
thanks
John

Wouldn't bother with replacement try for a refund and get or build something better.!!

Sounds very much like you have mechanical problems rather than Electrical if other Axis won't move when connected to Z axis drive. Very much doubt it will be dead stepper they are sturdy things and the fact you have 2 non moving Axis makes me think Mechanical.

So I'd start by removing the motors from screws and checking if they spin on there own drives with no load.?
Then work back from there removing ballnuts from the mounts first and spinning screws to see if end bearings are binding or the ballnut it's self has jammed.
It will become obvious whats causing the problem when motors are off.!!

[~andy]

Ballnuts! 1404 trapezoidal screws

I guessing they might be a wee bit stiff to turn by hand anyway.

[JAZZCNC]

Ballnuts! 1404 trapezoidal screws

I guessing they might be a wee bit stiff to turn by hand anyway.

Ye I knew chances are they would have Trap lead screws but easier to say ballscrew and ballnut has if new to cnc they would probably recognise those terms better than saying Leadnut etc .!! . . . . . . But in any case they should still turn by hand easy enough if Trap Lead screws.

[mugginsjm]

Wouldn't bother with replacement try for a refund and get or build something better.!!

Sounds very much like you have mechanical problems rather than Electrical if other Axis won't move when connected to Z axis drive. Very much doubt it will be dead stepper they are sturdy things and the fact you have 2 non moving Axis makes me think Mechanical.

So I'd start by removing the motors from screws and checking if they spin on there own drives with no load.?
Then work back from there removing ballnuts from the mounts first and spinning screws to see if end bearings are binding or the ballnut it's self has jammed.
It will become obvious whats causing the problem when motors are off.!!

Hi thanks for the response. My hobbies are woodturning and electronics, with very little mechanical experience. Hence building one is a bit daunting. I did as you suggested and removed the motors. The X motor didn't run but then after re-installing it, it did. Wiring? The Y axis motor (disconnected from drive) would not run at all on any pins, obviously faulty. Is it normal for there to be lateral movement, maybe 2mm when I pull along the X axis by hand.
thanks again
John
PS have asked for refund.

[JAZZCNC]

Is it normal for there to be lateral movement, maybe 2mm when I pull along the X axis by hand.
thanks again

Yes quite normal if it's Knackerd.!! . . . .Which by the sounds then it is.!

There should be NO lateral movement or Slop in any direction on any Axis. You will never cut correctly or with any accuracy if there's movement in any direction. Circles will be Ovals, edges will have steps at start and finish points and generally rubbish finish quality and poor accuracy.

. . Honestly Push hard for the Refund.