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Messages - simon67

Pages: 1
1
General Mach Discussion / Re: Direction pulse
« on: January 15, 2012, 02:02:07 AM »
Many thanks for that.
The drivers are now wired and working.

Simon

2
General Mach Discussion / Re: Direction pulse
« on: January 13, 2012, 02:32:07 AM »
Many thanks for that.
I have connected the enable line to the VCC 5 volt line and ground and this produces a held motor and also with it not connected when the rotor is then free to turn.
So if the direction signal is not required to get the motor to turn under power I'll double check the pulse timings and output voltage.
BTW the stepper drivers are model DQ860MA, I have already contacted the supplier for details on the stepper drivers, so fingers crossed all should become clear soon.

3
General Mach Discussion / Direction pulse
« on: January 12, 2012, 02:16:22 PM »
I need a little help....
I am wrestling with a problem with my direction pulse.
When I connected my BOB to my stepper drivers no matter how they are connected the motors will not turn under power.
After reading as much as I could find that was relative, I went back to my test setup and checked the outputs.
I have a lovely pulsed output from the step pin, but from what I read I should have a pulse from the direction pin which leads the pulses for the step signal by a time interval.
Well thats as I understood the theory anyway.

What I have got is a pulsed output on the step pin, however the direction pin merely changes from a high to a low state and vice versa on changing the direction of jogging.

Is this correct? If it is not correct how do I adjust the Mach3 settings to produce the required pulse?

If the pulse is not required then do I need to change the wirring to the BOB?

I am a total novice at this, and what does not help is the number of permutations that stepper motors can work with little regard to how to apply it.

Ie. CW/CCW mode step and direction mode, and that you have to wire this gear either pos or negative depending on your breakout board.

I have Totally covered all bases with the wiring, and tried every permutation, yet so far all I am able to achieve is a motor which is held once the power is applied, and so far as I understand or misunderstand am missing a specific pulse on the direction to make it run.

Am I barking up the wrong tree?

One final question for now, the enable input to the stepper drive, is this needed or is it optional? the reason I ask is because all I currently want to do is prove the motors actually work under Mach3, so I can complete the mechanical part of the conversion then faff about with this electronic stuff after the conversion is complete.
Regards
Simon

4
General Mach Discussion / Re: Mach3 not recognizing MPG
« on: January 09, 2012, 09:48:04 AM »
Thanks for the response Hood. However you misunderstood my post. Mach3 does not accept the MPG when configured as an MPG, but the disgnotics page when it is assigned as something else shows the pins working correctly for an MPG.

I installed a programme called Lpttest. and with it and my oscilloscope I was able to prove the function of each and every pin of the LPT port, yet no matter how I try I am unable to get Mach3 to use the port.

The port is the standard port built into the motherboard, and the address for the port is the default address.

The only discrepancy I have found is that windows device manager reports the port as "0378 - 037F" yet this format is not usable by Mach3 which has the address as 0x378.

I also checked all the pins of the parallel port, and while mach3 so far is able to accept "limited" inputs on the parallel port it is unable to produce an output, bearing in mind I am using an oscilloscope I checked the whole range of the output from 5volts down to the noise on the cable and Mach3 is producing no output at all.
I am beginning to wonder if this is a driver issue, given that many people use Mach3, however as the port works but does not work with Mach3 I am running out of options.

I am even at the point of considering EMC2 if Mach3 is unable to be sorted, however this is not too attractive given the use of linux

5
General Mach Discussion / Re: Mach3 not recognizing MPG
« on: January 08, 2012, 10:04:24 AM »
After further reading I am still confused, I acme across a site which attempted to explain what pullup and pulldown resistors are, I got it in so much as what they are and what they do, but in my application with the MPG going via the BOB would I need to use pullup or pull down resistors?
Afterall there is no point in my adding pulldown resistors if the signal Mach3 is expecting is a low signal or pullup for is Mach3 expects a high signal.
My breakout board only has the number x220826 as a means of identification.
I am also unclear if I actually need resistors given that Mach3 already reads the input if the pin assigned is addressed to a different function so Mach3 thinks it is not the MPG supplying the pulses.

6
General Mach Discussion / Mach3 not recognizing MPG
« on: January 08, 2012, 09:29:54 AM »
I am new to mach3 and hobby CNC in general.
The problem I am having is as follows.
I have an MPG which I have checked on my oscilloscope and proved to function correctly.
If I address / configure it, Mach3 simply acts dumb and it is as if the MPG is not connected.
So like a dog with a bone I kept at it, if I leave the MPG connected but configure it to act as Jog inputs, the diagnostic page shows the inputs are working correctly.
Unfortunatly the diagnostic page does not seem to go as far as showing MPG inputs.
So as there does not seem to be a way to change the signal from active low to active high or any other variables, how do I force Mach3 to use the MPG?

Simon

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