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Setting up Problem
« on: October 08, 2012, 01:36:35 AM »
Hi,
I'm not new to Mach3, & had been successful in installing & configure Mach3 a couple of times  in the pass.

I am encoutering a really weird behavior, can't really tell if it is a Mach3 problem, BOB problem or wiring problem.

Here's the scenario.
Installed Mach3, ran the speed test, all are well. Created custom screen, & started to go about configurating the motor & I/O
Config>Ports & pins , check #port 1, select 25khz. Unchecked everything else
Config>Ports & pins>motor outputs, plug in all the motor pins correctly, enable the x,y,z axis
Config>Motor tuning, "step per"=26.525, Velocity=3000, Acceleration 300. on all axis.
#ps, I'm using Module 1.0 rack & pinion. pinion gear is 24 tooth. 10 microsteps. step per=200x10/(24pi)=26.525
Restart Mach3
press arrow key-> DRO moved, motor no response,
press Pgup, Pgdn-> DRO moved, motor no response

I then test the bob by using the spindle toggle in the dianostic screen, LED on BOB terminals & all the output behaved accordingly.

I then fiddleing will all the check boxes & found out that the motor only response when the  MaxCL box is checked. but in a strange way.
In the MaxCL mode, disregard of which terninals between 4,5,6,7,8,9 I plug in the stepper motor driver input, the same motor will move only in the same direction when I press the same key...
Also, the travel is only 1/4 of what it is expected. exactly 1/4

I'd swapped PC, swapped BOB, swap LPT cable. & nothing works for me when MaxCL was unchecked...

Offline Tweakie.CNC

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Re: Setting up Problem
« Reply #1 on: October 08, 2012, 03:01:07 AM »
Hi Khinhaw,

It is my understanding that unless you are using a Maxnc machine controller then you should forget about checking this mode in the setup (it allocates its own pin configuration irrespective of what you have set in ports & pins).

Try using Sherline 1/2 pulse mode and see if that helps.

Also check the output voltage on one of your LPT 'direction' pins to see if it is approx. 0 / 5 Volts as opposed to 0 / 3.3 Volts.

Tweakie.
Success consists of going from failure to failure without loss of enthusiasm.  Winston Churchill.
Re: Setting up Problem
« Reply #2 on: October 08, 2012, 03:28:18 AM »
I tried Sherline 1/2 pulse mode & motor remained un-responsive. but DRO moved.

I switched to Maxnc mode again, (this is the only time when the BOB's motor pin actually produce any sort of signal.) & I get about 3V from DIR & STEP pins, I type in G0 x2000000 to send some pulses for testing on X axis motor pins on the BOB

Offline Tweakie.CNC

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Re: Setting up Problem
« Reply #3 on: October 08, 2012, 03:52:19 AM »
Hi Khinhaw,

Sorry if I did not explain properly. If you are not using a Maxnc controller then DO NOT use Maxnc mode. You will just be wasting your time and achieve no useful results.

Measure the voltage on your X Axis 'direction' pin at the LPT output. Moving the X Axis in one direction should produce 5 Volts then moving the same axis in the other direction should produce 0 Volts. If you only get 3.3 Volts here then it may not be sufficient to drive your BOB so fitting a 5 Volt output Parallel Port card may be the way forward.

Have you tried changing the Active Low / Active High settings for your 'Step' pins ??

Tweakie.
Success consists of going from failure to failure without loss of enthusiasm.  Winston Churchill.
Re: Setting up Problem
« Reply #4 on: October 08, 2012, 04:43:55 AM »
Tweakie.CNC, thanks for the heads up. the X-DIR measures 4.3V on my DMM. MaxCL un-checked
Re: Setting up Problem
« Reply #5 on: October 08, 2012, 05:03:20 AM »
Sorry, both directions measures 4.3V on the LPT pins

Offline Tweakie.CNC

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Re: Setting up Problem
« Reply #6 on: October 08, 2012, 05:18:03 AM »
If your meter is connected between the correct X Axis 'direction' pin (whatever it is) and computer GND then the voltage should change between your 4.3V and 0V (approx.) when you move the X Axis in opposite directions. This should occur irrespective of anything else connected.

So try closing Mach3, disconnecting the CNC machine from the PC then restart Mach3, check your ports & pins configuration again and measure the voltage on your X Axis direction pin at your LPT cable. Does it now change voltage level when you jog the X Axis ??

Tweakie.

Success consists of going from failure to failure without loss of enthusiasm.  Winston Churchill.
Re: Setting up Problem
« Reply #7 on: October 08, 2012, 06:47:01 AM »
Tweakie.cnc.
Done all that & the pin remains 4.2V
my pin2 isX-DIR, pin4 is Y-DIR, when I run G0 X20000Y20000, then G0X-20000Y-20000 the voltage reading remains at 4.3V
DMM probe +ve at Pin 2 or 4, COM pin ar DB25 25pin

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Re: Setting up Problem
« Reply #8 on: October 08, 2012, 07:28:16 AM »
That whittles it down a bit then - some possibilities areā€¦

A bad installation of Mach3
A damaged parallel port or LPT cable.
Incorrect configuration of the Ports and Pins within Mach3.

Are you using Win XP ??

Tweakie.
Success consists of going from failure to failure without loss of enthusiasm.  Winston Churchill.
Re: Setting up Problem
« Reply #9 on: October 08, 2012, 09:04:32 AM »
Re installed Mach3 many time.

Swap a few LPT cables, even bought new ones for the purpose.

I wouldn't know for sure, but I checked the port & pins configuration, Even strip it down to only the motors & Charge-pump. yet no good.

I'm using XP. I even swap PC... one which proven working on another machine...