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Messages - Inferno

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31
General Mach Discussion / Re: Only X-axis motor is working
« on: April 02, 2018, 11:36:43 PM »
When you say resonance, are you saying electrical resonance or mechanical?

I ask because the motor does that even with a load on it.

I should shoot a small youtube video of it.

If I set the signal to low side the problem persists but is reduced.

I'm looking around for a 4 wire stepper to see if I get the same effect on a 4 wire.

32
General Mach Discussion / Re: Only X-axis motor is working
« on: April 02, 2018, 10:01:29 PM »
I found a 5v power supply and disconnected the PS from the computer.
I common grounded (earthed) everything.

No change in the results.

This is compelling.

33
General Mach Discussion / Re: Only X-axis motor is working
« on: April 02, 2018, 09:41:48 PM »
Ha, I saw "earthling".

So, I tried the LED test. The LED doesn't blink as if it's getting a cruddy signal.

I thought I'd try some other things while I'm waiting for the Oscope and haven't found a 5v supply yet.

First. I get 4.8v at the signal pins to the driver. It appears consistent via the LED and the multimeter which, admittedly, are both flawed in their functions.
Then I thought I'd go into the motor tuning and play with the velocities to see what happens when.

Here's where it got fun.

I set the velocity at "1", but the program saved the velocity a hair over "1", and was able to single step the motor perfectly. It did, however, make noises while holding certain steps.

Next I thought I'd set the velocity to 50. When cycling the motor it was a VERY loud motor.

When I set the velocity to 45 the motor hops around. It's back and forth all over the place.
At 100 the motor runs smooth.

So, something causes the motor to freak out around the 45 steps per second mark.


34
General Mach Discussion / Re: Only X-axis motor is working
« on: April 02, 2018, 05:04:04 PM »
I looked up the specs on my computer today and was shocked that it only has a 200w power supply. What a piece of junk.

I was reminded of a problem I had with a computer about 12 years ago. Whenever I went to print I would have to turn off a peripheral or the computer would lock up solid. The company had a dozen of these computers and all of them died within a year or so. All were bad power supplies.

This makes me wonder if it's as simple as that. Maybe the 3.3v is enough for my BoB but the 3.3 is tapped when more than one signal is sent. Worth a thought anyhow.

Tonight, since I don't have the oscilloscope yet, I will connect leds and maybe pullup/down resistors to see if anything jumps out.
I can also, probably, dig up a 5v power supply and isolate it from the host computer.

35
General Mach Discussion / Re: Only X-axis motor is working
« on: April 02, 2018, 02:02:47 AM »
I think I'm going to connect an LED to the direction pin to see if it's switching when the motor is hiccupping. It's not definitive but could tell me something til the scope arrives.

36
General Mach Discussion / Re: Only X-axis motor is working
« on: April 02, 2018, 01:07:52 AM »
I do want to add in that I'm using drivers that are very popular (yes, I know, price and all) and am having a hard time believing that I have 8 bad drivers.
I've also used 3 different BoB's from 2 different sources and have a hard time believing I have 3 bad BoB's (although admittedly I may have burned up the first two but I doubt it based on the knowledge I gleaned while figuring things out).

I KNOW my cable is good now. I know I have a full 5V power from the PC cuz it's hard wired now. There's still the possibility of the 3.3v signal coming from the PC causing problems. I have a parallel port expansion card on the way with the oscilloscope.

And, yes, once I get the whole thing figured out I will buy a beefier power supply. I don't have an unlimited budget so I have to take baby steps. Once everything is built, I will upgrade the components as this will, hopefully, be a money-making venture in the long run.

37
General Mach Discussion / Re: Only X-axis motor is working
« on: April 02, 2018, 12:42:38 AM »
I'm not discounting what you guys are saying. I just don't have a way to test it yet. That's why I have the oscilloscope on the way. I can't keep throwing money out there looking for the problem. Once I have it checked with an oscilloscope I will know what's what.

Until then, I tinker. LOL

Also, when I say it appears to back up, it can back up 10 steps and then flip forward again.

I also need to check to make sure I have the coils in the proper sequence. You'd think that if I had one of them flipped then it wouldn't turn at all but who knows at this point.


38
General Mach Discussion / Re: Only X-axis motor is working
« on: April 01, 2018, 11:57:35 PM »
Progress but no progress.

I found the reason the pattern was what it was. It was simple math.

I had my tuning set at 600 steps per inch. That means that the program needed to drop two steps out of each five to maintain the .001" accuracy that's built in by default.
I set the tuning to 1000 steps per inch and it now jog-steps one step at a time with no missed steps.

Then I ran my g-code file and checked and it lost accuracy again. So there's still the original issue. It drops steps or, rather, reverses some. And it seems to do it on slow steps only.

39
General Mach Discussion / Re: Only X-axis motor is working
« on: April 01, 2018, 10:37:03 PM »
Where is the 4.5 V? If it is on a rail, very strange. If it is on an output, fine.
If it is on a rail, can you identify the convertor chip, and is there a small adjustable pot nearby?

Cheers
Roger

The 4.5 is on the output.
As near as I can remember there's no pot on the board. I'd look but ended up with a lap parasite (neighborhood cat) keeping me from playing with the board.

EDIT


Parasite detached. There are no pots on the board. A total of a dozen resistors only. No way to adjust the output voltage without knowing which resistor to remove and what value to install.

40
General Mach Discussion / Re: Only X-axis motor is working
« on: April 01, 2018, 09:29:23 PM »
I've ordered an oscilloscope but it won't be here for a week. I plan on using it on the power supply and the stepper signals.
I've checked power in just about every area I can with a multimeter and get no discrepancies along the way.

The 24v power supply has the same numbers across all the drivers whether under load or not. If there's a weird signal there, I won't pick it up til I get it on the scope.

The only weird thing I see at this point is the 4.5v signal when I am supplying 5.1v but it's less odd when I was getting 4.45 when only supplying 3.3v. I suspect it's a regulated signal to be @4.5v.

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