Messages

2531

General Mach Discussion / Re: What has gone wrong????

« on: March 07, 2014, 05:16:03 AM »

Spoke to the BOB suppliers, seems the BOB is fried 100%. (:

The LED is the output from the onboard regulator so its turning itself off randomly.

They also said it was wired wrongly, I had the BOB supply fed from the Z-axis output of the motor PSU, apparently that is bad and must be a separate regulated supply for the BOB only.

Anyone know anything about this?

2532

General Mach Discussion / Re: What has gone wrong????

« on: March 07, 2014, 03:36:12 AM »

Diagnostics show the freq as around 28,048 and time in int as +5 to +6 varying.

I need to ring the suppliers to find out what that LED actually means, when that goes off is when the problems arise, I thought it was a power LED, in that case it might be the PSU?

The mach driver test still passes as "Excellent", nice and smooth on the graph.

2533

General Mach Discussion / Re: What has gone wrong????

« on: March 07, 2014, 02:56:31 AM »

Are these pulses in the kHz range ?

I have a slow scope, not digital, I think its DC to 5mHz possibly.

just been messing about and noticed that there is an LED on the BOB, this is on normally, but after running the axes up and down manually a bit, the LED flashed off then on and Mach threw the e-stop requested error, after that the torch relay will not trigger and the axes start messing about.

I really can't believe I've fried a BOB or the PC surely?

If that is the case then there is little hope of success as I have done almost everything I can to shield this stuff, I have not driven a ground rod yet as its in the factory at work and i doubt the landlord would appreciate that

I could understand it if I hadn't connected the plasma ground lead or something else stupid but I even checked it with a meter first!

2534

General Mach Discussion / Re: What has gone wrong????

« on: March 06, 2014, 02:54:34 PM »

My profound apologies, I meant restarted NOT reloaded mach, I have not reinstalled it yet.

Everything was fine and calibrated very nicely.

2535

General Mach Discussion / Re: What has gone wrong????

« on: March 06, 2014, 02:27:11 PM »

Yes, the table has been running a felt tipped pen for a good few weeks, perfectly at various speeds and has not so much as dropped a step!

I even tested it before firing the torch and all was well.

2536

General Mach Discussion / What has gone wrong????

« on: March 06, 2014, 10:23:06 AM »

Ok so I have been eagerly awaiting the delivery of my new plasma torch, while waiting I have been extensively testing and debugging my new DIY cnc table and it was all going very nicely.

The torch came this morning so i moved the table into my test area, connected up the ground clamp and powered the system up.

All went ok, placed a bit of test metal on the table, moved to take a test fire and triggered a quick pierce signal, no cut just a quick pierce.

That went ok so i went to move the torch back to start position for a cut test, the torch would not move so i pressed the estop and restarted, z axis started moving and partial x axis but not Y.

Killed the plasma supply and reloaded Mach.

Now it was jumping about randomly as i turned the MPG knob on the pendant and kept throwing "e-stop requested" errors.

Thinking it might be my cheapo crap pendant, i unplugged it, turned off "run macro-pump" and disabled support for modbus/mpg.

Then i reloaded Mach and tried again, now it sort of moves but the DRO's are moving like 20mm for every mm moved.

Pressing home all, would bring the axes to home but then back off at 1% speed or very slow at least.

It would also still throw the e-stop requested errors.



Now, having spent a lot of effort hardening the table against RF, I cant believe I have fried it with a two second pierce?
No other PC's in the area showed any sign of problem and there was no radio interference.
This was just a quick pierce at half power.

Any suggestions at all?
I'm desperate.

2537

General Mach Discussion / Re: X Limit switch challenges

« on: February 23, 2014, 03:48:41 PM »

Sounds like you either need to make the switches NC or flip the setting in pis & ports so that it is active low or the opposite of what is set now.

2538

General Mach Discussion / Re: Modbus / MPG help...

« on: February 17, 2014, 12:56:46 PM »

I think it outlines how flexible mach is under the hood, this is a dirt-cheap pendant clone and with a minor tweak it's now working well.

Clever stuff, thanks for the assistance.

2539

General Mach Discussion / Re: Soft limits info please...

« on: February 17, 2014, 12:53:45 PM »

Ok here's what I've done...

I have disabled the soft limits on the z axis, this makes the code run very nicely.

Secondly, I have modified the probe switch so that it now has two break contacts, one opens for the probe sense and further travel opens the second contact as a limit switch.

Now, when probing it works as normal, but during manual  z axis movement if I ram the torch into the table the second switch acts as a normal limit switch. Works pretty sweetly too

At least I know that it is the way the probing is initiated that was causing the issue now.

Thanks for the help on this one.

2540

General Mach Discussion / Re: Soft limits info please...

« on: February 17, 2014, 09:56:21 AM »

That's a pretty good point there Stirling, thanks.

I'll kill the Z soft limit at least for now.

My main goal is to protect the machine not the workpiece at present, this is hobby stuff and i've spent a fair bit on it so just want to protect my build that's all.

Dave