View Full Version : stepper motor plug

22-06-2017, 04:23 PM
Hi, the way things are going this may be the shortest membership of MYCNCUK.!!
Apart from the other issues I'm having the red wire on the Z axis stepper motor plug decided to fall out.It doesn't look as though it was crimped at all? Any suggestions as to how I can remove the pin to reconnect it? I've tried a ground down small instrument screwdriver in the square hole above the pin but so far no luck.
Hoping for an answer

Bob S.

john swift
22-06-2017, 05:30 PM
Hi Bob
I can not help with the connector they have used

as a plan "B"

you could solder the motor wires to the cable
( after threading heat shrink sleeving on the motor wires first so you can insulate the joints once the solder has cooled )

or use the 4 pole molex connectors used in PC's
they are rated 7A
and are available from Maplin if you want to buy the locally



22-06-2017, 06:58 PM
Hi John,

Thank you for the suggestion. At the moment I am considering returning said machine and do not want to do a permanent repair. I know I have to bend a small tab to release the pin but unlike the female plug the tab on the male plug is hidden from view. Anyway I'll keep trying and see what happens.

23-06-2017, 12:08 AM
It will not of been crimped correctly. A couple wires on my 3020 fell out just trying to get the connectors apart, and a few more came out with just a slight pull.

It will probably need a release tool with a curve/hook in it to press the release tab.

Personally, I'd remove all the connectors, and join the wires directly. I used good quality butt crimps on mine.

23-06-2017, 03:24 PM
Well I eventually managed to release the pin and have reconnected the wire. At the moment I am in two minds whether to return the machine or keep it. If I keep it then I will rewire and upgrade the controller/drivers to something more reliable. Waiting for the vendor to provide a fix? for the noise/vibration from the X axis. Hoping for a satisfactory outcome.
Thank you both for your advice.

Bob S.