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

[Jonathan]

i jog down it goes up and when i jog up it goes down

If that's the only problem it implies the direction setting for Z in mach 3 is set the wrong way. Could try going to "Config"->"Ports & Pins"->"Motor Outputs" then changing "Dir LowActive" on the line for Z. However if it's working fine in another place that's not going to help you. The only things that can change the motor direction is the state of the direction pin on the stepper driver, or changing the polarity of either phase. The latter surely cannot happen, so I'd put a voltmeter on the Z-axis driver direction pin and see if it looks right.

Whereabouts are you in Nottingham? I'm at University of Nottingham so if you don't get it sorted today I'm happy to come and have a look as it shouldn't be far?

[camhguh]

If that's the only problem it implies the direction setting for Z in mach 3 is set the wrong way. Could try going to "Config"->"Ports & Pins"->"Motor Outputs" then changing "Dir LowActive" on the line for Z. However if it's working fine in another place that's not going to help you. The only things that can change the motor direction is the state of the direction pin on the stepper driver, or changing the polarity of either phase. The latter surely cannot happen, so I'd put a voltmeter on the Z-axis driver direction pin and see if it looks right.

Whereabouts are you in Nottingham? I'm at University of Nottingham so if you don't get it sorted today I'm happy to come and have a look as it shouldn't be far?

Sorry i missed your offer to come and sort us out Jonathan, lol, much appreciated mate!

At the moment we are able to run ok on approx 50% of the bed without problems which enables us to continue and produce parts (for the moment anyway!)

In the meantime I will make up a new cable if i can work out what the connectors are!

[Philly]

Sorry i missed your offer to come and sort us out Jonathan, lol, much appreciated mate!

At the moment we are able to run ok on approx 50% of the bed without problems which enables us to continue and produce parts (for the moment anyway!)

In the meantime I will make up a new cable if i can work out what the connectors are!

Try the yellow cable that connects to the Z axis connector on the parellel board. I had a similar fault and it turned out to be loose in the socket.

Phil

[camhguh]

Thanks for the suggestion Phil!

I made up a new cable this evening and although i havnt tested it in anger yet, the z axis does seem to work ok while moving the gantry back and forth.

Hopefully problem solved!!

[JAZZCNC]

Bugger me my machine went and did this yesterday.!! . . . I've just transfered all my control box into a new larger box. . . . I knew straight away what it was and to be honest I'm embaressed that I didn't think about it in your case.

It's one of the Dir pin wires thats either come out at drive or connection/wire come lose in motor. To be honest I didn't expect it to behave how it did.? I expected it would only move in one direction but it infact it was moving in one direction then changed direction randomly.!!