[swither]

Hi!

I'm trying to get a LPKF 91 pcb mill with a broken controller board working again.

The mill has 2 stepper motors for x and y axis and a solenoid for the z axis.

What i need to do is replace the whole controller with hardware, only thing i'm worried about however is that i have found no information about using cnc softwares with solenoids for z-axis (it's only on or off basicly). Any ideas?

Also, if you have any example controllerboards i could go for i would love to hear your ideas!

[Jay C]

Just talking out loud but a post processor that looked for and appended all Z values with an M code that activated your solenoid could be an option.Like flood coolant on/off or something like that.

[chuck99z28]

So there's no chance of fixing the control board?

[Zig]

Chuck,

There is ALL the possibilty to convert the equipment to run on EMC2.

Set Your EMC2 to run the machine frame ( machine frame size, leadscrew pitch , motor steps /revolution , homing etc).

For Z axis do the same and limit Z axis to something sensible like say 10 to 20 mm ( or inch equivalent).

Make sure the Z axis is set up for step direction stepper motor configuration.

Ignore the step signal and connect your solenoid driver to the DIRECTION SIGNAL . This way you will activate the Z axis correctly.

I had a look at LPKF gear way back. Too expensive for my budgetat the time so I made my own.

Good luck and feel free to curse the solution if it does not work out .. but I think You owe me a beer. :cheers:

[chuck99z28]

Zig,
I'd be happy to buy you a beer anytime.

But Swither was the guy with the LPKF issues.

Chuck

[Zig]

Ahh....
welll....
beter to have beer issues than LPKF issues...
in any case a beerzaberzabeerzabeerzabeerzabeerza...

[rfsolution]

Hi!

I'm trying to get a LPKF 91 pcb mill with a broken controller board working again.

The mill has 2 stepper motors for x and y axis and a solenoid for the z axis.

What i need to do is replace the whole controller with hardware, only thing i'm worried about however is that i have found no information about using cnc softwares with solenoids for z-axis (it's only on or off basicly). Any ideas?

Also, if you have any example controllerboards i could go for i would love to hear your ideas!

Hi,


Having the same problem,

a broken controller, I tried several PC's and cables still get buffer overrun after a few seconds of milling
the com port is ok, FIFO is off and hardware handshaking is used
If I try the same PC,serial cable etc on another lpkf 91s it is working fine

I think it has something to do with the hardware handshaking part
I replaced the MAX235 but still the same problem

I know will try to replace the CNY74-4 optocouplers which are after the
MAX235

What is your problem with your board ?