ghost in the x axis - bad electrical connection

hi
in mach 3 if i jog the x axis in the + direction then stop , then jog again in the in the + direction , some times the axis goes the opposite way but the dro is still incrementing in the + direction , anyone any ideas

also does the same when cutting , disconnected the motor from the screw so as there is no load and it still does it

John

I had this problem with EMC2 and after checking things for the 50,000 time it turned out to be a bad contact on a motor wire. Suggest you loosen the screws on that motor, take them out, re twist or solder the ends and put hem back. Worth a try

thanks 2e0poz
will check wiring , as you say for the 50,000 time tomorrow, it must be a wiring prob but do you think i can find it
thats the great thing about this cnc mallarky .. keeps the mind active

also check your direction feed.

hi
found it at last one of the motor wires , going into the terminal block on the driver was under the spade screw instead of between it although to the touch the wire felt solid it wasnt a good electrical connection , wire in right place everything ok now ... for some thing so simple its been a right pain in the arse

Glad to see you grb the gremlin by the P****** John and now under control