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Author Topic: Only X-axis motor is working  (Read 11477 times)

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Re: Only X-axis motor is working
« Reply #30 on: March 21, 2018, 09:29:54 AM »
On screen DRO shows the axis are moving, all 4 of them.

I've swapped the x and y on the board to verify that the drivers are working and the motors are working. All 4 drivers and all 4 motors move when connected to the X axis on the breakout board.

I've enabled pin 14  and disabled pin 14 and neither had an affect. The X axis works both ways.

I will get the xml file tonight


Just to make sure the breakout boards aren't fried, I ordered two more. Hopefully they will get here by Saturday.
Re: Only X-axis motor is working
« Reply #31 on: March 21, 2018, 10:53:14 PM »

Offline rcaffin

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Re: Only X-axis motor is working
« Reply #32 on: March 21, 2018, 11:18:23 PM »
All 4 drivers and all 4 motors move when connected to the X axis on the breakout board.
In that case we should assume that the drivers and motors are OK.

Which leaves the breakout board itself and the signals going into the BoB. You need to check both to see if there are any 'gaps' in the signal flow.  Replacing the BoB is certainly one way of making these checks without any detailed probing.

I f replacing the BoB does not bring a cure, you will have to look further upstream.

Cheers
Roger
Re: Only X-axis motor is working
« Reply #33 on: March 21, 2018, 11:28:20 PM »
All 4 drivers and all 4 motors move when connected to the X axis on the breakout board.
In that case we should assume that the drivers and motors are OK.

Which leaves the breakout board itself and the signals going into the BoB. You need to check both to see if there are any 'gaps' in the signal flow.  Replacing the BoB is certainly one way of making these checks without any detailed probing.

I f replacing the BoB does not bring a cure, you will have to look further upstream.

Cheers
Roger

Yeah, kind of my way of thinking about it.
I'd do probing if
1) I knew what I was trying to see with the probe
2) It could be done with a multimeter
3) If I hadn't just blown off the probes on my multimeter. (more probes on the way)

Offline rcaffin

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Re: Only X-axis motor is working
« Reply #34 on: March 21, 2018, 11:34:53 PM »
If I hadn't just blown off the probes on my multimeter.
The mind boggles! I have an image of a molten probe tips ...

You could EASILY make up a logic probe with a red LED and a 220 ohm resistor and a couple of bits of stiff copper wire. Ever so useful.

Cheers
Roger
Re: Only X-axis motor is working
« Reply #35 on: March 22, 2018, 12:07:18 AM »
If I hadn't just blown off the probes on my multimeter.
The mind boggles! I have an image of a molten probe tips ...

You could EASILY make up a logic probe with a red LED and a 220 ohm resistor and a couple of bits of stiff copper wire. Ever so useful.

Cheers
Roger


Actually, there was no melting of probes. There was a bright white light a loud pop and the ensuing green blind spot in my vision.

Does it have to be a red LED? I have green, blue, yellow, amber, orange, IR, UV and white. ;)

I think I have some 220Ω resistors around here somewhere.
I know I have blank multimeter probes that I could morph into a holder for an LED and resistor. hmmm.

Offline rcaffin

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Re: Only X-axis motor is working
« Reply #36 on: March 22, 2018, 01:32:25 AM »
It can be any colour you want.
I suggest that neither IR nor UV are good choices as you can't see them :)
White is attractive but white LEDs require about 3.6 V, which is not going to work too well when you are checking 3.3 V logic chips. They might work, sort of. Red LEDs require about 1.2 V from memory.

Logic probes are much faster than multimeters, plus you can leave a few LEDs in the output screw terminals for a while.

I have some test boxes which consist of a numbered row of Red LEDs with a multi-core cable ending in a selection of Ezy-Hooks. I colour-coded the Ezy-Hooks to the resistor colour code. Hook the clips up, jiggle Mach3, watch the pretty lights flash.

Cheers
Roger
Re: Only X-axis motor is working
« Reply #37 on: March 22, 2018, 02:11:56 AM »
I threw a little sarcasm in there for humor. It might have missed it's mark.

I wasn't finding a 220Ω resistor too easy  so I am going to use a 560Ω and a blue LED. Just for style. I might even pull out a few and hook them up but for now, here are my results.

Without Mach3 running and the 24v supply turned off, I only have the 5v USB power on the BoB.

Probing the output pins I get the following

P2 -
P3 +
P4 -
P5 -
P6 +
P7 +
P8 +
P9 +

This tells me something is wrong

Offline TPS

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Re: Only X-axis motor is working
« Reply #38 on: March 22, 2018, 02:37:42 AM »
ok had a look to your XML.
it seems to be bad, it contains only Step per, ACC and Vel infomation for axis 0 (x).
i know that Information is shown for the other axis in Motor Tuning, dont ask me why.

so i would start with a new fresh Profile, Setup axis should not take very Long.
« Last Edit: March 22, 2018, 02:41:42 AM by TPS »
anything is possible, just try it.
if you find some mistakes, in my bad bavarian english,they are yours.

Offline rcaffin

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Re: Only X-axis motor is working
« Reply #39 on: March 22, 2018, 03:25:44 AM »
A blue LED has a higher voltage drop, above 4V (like a white LED). It is probably the worst choice for this. If you don't have a red LED, try an orange one. Basically, the longer the wavelength, the lower the voltage. (And a red LED is more like 1.8V - my bad.)

Now, fire up Mach and see if you can get any changes to those results by toggling the Active Hi/Lo boxes in Mach.

Cheers
Roger