Weird problem with stepper axis.

[A_Camera]

I am sorry, I don't have time to talk you trough, but it would help if you'd answered ALL questions, when asked. We are only trying to help. For example, the question about if this never worked or it worked at one time, but now not working any more.

There is no need for an oscilloscope normally, a simple DVM would be more than enough to check all the wiring. The untidy wiring in itself is not disturbing me, but it is a good source of error. The picture you included is so small, it is for me impossible to see what is connected to where. Did you make a schematic of the connections, or you just started wiring? A drawing would be more helpful than a picture of the wiring in my opinion. Also, the second picture is showing ONE axis configuration, but you are not saying which one. Anyway, how about the other two axis configuration?

I also assume you bought an original UC100 from a legitimate seller, not one of those fake eBay copies. Those copies may or may not work, but most probably will never really get it right with a fake one.

[JAZZCNC]

KISS is your friend when you have issues like this and don't have the experience to diagnose issues. So If you are not confident with the wiring then Go Back to Basics, remove the Rat's nest of wires from the BOB and just get one axis working, then rinse and repeat for each axis, checking as you go.

Then start adding other wiring like E-stop, limits, etc one at a time, again checking as you go. Don't bother with the enable as it's not really needed and just adds more complexity at this stage. You can always add it later along with monitoring the fault signals.

[GREG021]

Hi
This is a new setup, the only original parts are the motors.
As explained the machine came with a Gecko G540 which had corroded connectors.
The UC100 is from UCCNC so is fine.
The axis config print is for the X-axis the only changes on the other axis is the pin and ports.
X-axis Pul- pin2 Dir- pin3 port 1
Y-axis Pul- pin4 Dir- pin5 port 1
Z-axis Pul- pin6 Dir- pin7 port 1

I hope that has answered all your questions. If you need anything else I am only too happy to oblige.

[A_Camera]

Like Jazz said. Rip out all the wires and start all over again, one axis first. But before that, make a wiring diagram and start wiring when that is done and is right. Use the diagram as a guide and mark every wire you have connected. Use a multimeter to check the connection from point to point for every single wire BEFORE trying to run that axis. Don't power it up before that step.
Obviously something is wrong and you have no idea what, so I think also that it's best to start over. Just one more question. Do you use a 25 pin parallel port cable between the UC100 and the bob, or just a short ribbon cable? You could try a different cable just in case...

[GREG021]

Hello

The UC100 plugs directly into the DB25 of the bob.
Great advice, I was becoming impatient after spending weeks on the Gecko.
I will do as you and Jazz suggest and be more methodical.

Many Thanks, Greg