help with problem please

[martin54]

no loose wires Jazz, it's the same 2 axis all the time, machine jogs about great when first started then you go to jog either the y or z axis & the motors don't turn but the dro on mach3 is moving

[JAZZCNC]

no loose wires Jazz, it's the same 2 axis all the time, machine jogs about great when first started then you go to jog either the y or z axis & the motors don't turn but the dro on mach3 is moving

Try swapping X axis drive with Y axis or Z axis and see if it moves. This will confirm or eliminate the drive from picture.

[JAZZCNC]

As it got a shity cheap chinese BOB.?

[martin54]

As it got a shity cheap chinese BOB.?

Yer & cheap Chinese drivers as well, he bought 3 drivers & a bob, wired it all up & the x axis driver blew up, seller told him to try again & he blew up another driver lol, was asked for pictures to ensure all was wired correctly & after sending the pictures was sent a complete new set of drivers & bob, still no joy so seller sent another bob

[JAZZCNC]

Yer & cheap Chinese drivers as well, he bought 3 drivers & a bob, wired it all up & the x axis driver blew up, seller told him to try again & he blew up another driver lol, was asked for pictures to ensure all was wired correctly & after sending the pictures was sent a complete new set of drivers & bob, still no joy so seller sent another bob

Ok Well sounds like he needs to take the Hint and buy some decent gear.! . . . . . Bet there the TB based drives as well.?

That said Because 2 drives are going off at same time I'd be inclind to think it's the BOB not the drives but swapping the good working axis drive will show up if it's the drive or BOB.?

Not something I'd recommend unless the person is confident with electrics is to by pass the BOB all together and wire direct from the PP pins but this is a risky move and could blow the PP if not done correctly. So only for the competent hacker really.!

[martin54]

will try switching the axis around to see what happens, could probably use my bob to test the machine if I had to, I know that works fine lol

[JAZZCNC]

will try switching the axis around to see what happens, could probably use my bob to test the machine if I had to, I know that works fine lol

Would only do that as a last resort if it's not a spare BOB. Could be something else killing the BOB, if indeed it is the BOB, doubt somethings killing it it but could be.!
Something I would try that wont hurt is your parallel port cable.! . . . In past I've had cables give silly troubles but often they just don't work or are irratic never worked then stopped so it's a clutching straws move. But still easy try so worth doing for elimination purposes.

Another thing worth trying that won't hurt and is a big elimination is trying your PC. This takes the PP and software out the equation which are both candidates for trouble.!