Y axis problem

[Kev2960]

Hi yes the error is cumulative while air cutting, I also thought the G code from mach 3 might be the problem so I took a circle from my mazak at work but that still had the same effect. I'm a bit stumped as to what it might be

[Neale]

again, sorry for asking simple questions, but it does help eliminate the obvious!

This also happens if cutting a square? Have you tried typing manual gcode into the MDI window? Something like (assuming you are starting at (0,0)):
F100
g1x100
G1y100
G1x0

That's about as simple as it gets and you have control over reversals of direction - circles have a lot more in them so less clear exactly what is happening.
G1y0

[Kev2960]

I've done the test you suggest all ok. I've also done rapid to position over a distance of 400mm to zero and zero to 400mm and it's right every time. Back to a circle and it's out of position again. Also used a wizard rec pocket and that was ok.

[magicniner]

There will be no magic involved and finding situations where the error doesn't occur rarely helps to narrow down what's causing it where it does. Assuming you have some matching drivers in your system swap one over with the Y and see if the fault stays with the axis or follows the driver, ditto the motor. You can test your break out board by swapping X and Y outputs and swapping pin out config in Mach3 and seeing if the fault stays with the axis or moves with the BOB output.
If the fault isn't in the electrics then it's mechanical.

- Nick

[Kev2960]

I think It's the driver so bought a Hy-DIV268N-5A from eBay to see if that might work, the wiring is not the same so can anyone help
My machine has these;
DC DC BB AA GND V+ P 5v Dir
The driver from eBay has these;
DC DC BB AA EN EN PUL PUL
DIR DIR
Where do the V+ and 5v wires go ?

[Boyan Silyavski]

The way i see it:

1.Nobody said the obvious: the rising edge of the signal is not right most possibly. Just change it and try again. That 99% is the problem. /just saw Neale pointed you/ . Did you do something about it?

2. Mach3. Clean install and try again. Hve been there a couple of times

[Clive S]

The way i see it:

1.Nobody said the obvious: the rising edge of the signal is not right most possibly. Just change it and try again. That 99% is the problem. /just saw Neale pointed you/ . Did you do something about it?

2. Mach3. Clean install and try again. Hve been there a couple of times

Again Boyan you are jumping in and have not read the post from the beginning, If you read post #13 there is no way that a rising edge problem would be 0.3mm out on such a simple cut. In this case you are muddying the waters.

[Clive S]

I think It's the driver so bought a Hy-DIV268N-5A from eBay to see if that might work, the wiring is not the same so can anyone help
My machine has these;
DC DC BB AA GND V+ P 5v Dir
The driver from eBay has these;
DC DC BB AA EN EN PUL PUL
DIR DIR
Where do the V+ and 5v wires go ?

A picture of the wire connections to the drive would help or a link to it.
But basically DC,DC,BB,AA are the same. EN (enable) may not be needed but the PUL and PUL etc with have a +ve or -ve and which way you connect them can vary.

[Kev2960]

Hi Clive I've got a couple of photo's for you. The one on the left is the one i bought off ebay that i want to try in place of the existing one, the other two are from my machine. P 5v DIR go to the Y axis on the bob--dip switch--24v input--BB AA for the stepper motor. So basicly i just want to connect up the one on the left

[Clive S]

Kev I would connect 5v +ve to the pulse +ve and dir +ve on the new drive and connect the pulse -ve and dir -ve to the controller.

You will also have to probably set the dip switches to the same as the original drive