Messages

51

General Mach Discussion / Re: I could really use some help with motor tuning...I think

« on: May 27, 2013, 04:47:34 PM »

Ahh, I'm learning more as I go along. My tech guy tells me if I can figure it out I can probable get the micro steps engaged and get even more precision but I'll wait until I get this nailed down first.

52

General Mach Discussion / Re: I could really use some help with motor tuning...I think

« on: May 27, 2013, 04:18:39 PM »

Just got back from work so I'm going to give it a shot.

The spec sheet I was able to find for these steppers says the screws are 1.8 degree pitch.

53

General Mach Discussion / Re: I could really use some help with motor tuning...I think

« on: May 27, 2013, 12:01:40 PM »

Scott fixed it.

Steppers and the part numbers are in the first post.

I Did a simpler cut yesterday and it went much better. It was supposed to be 8" tall (y axis) and 6 1/4"wide (X axis). Ended up 8" exactly tall but 6 3/8" wide.

Going to try cutting it several more times to see how it does.

54

General Mach Discussion / Re: I could really use some help with motor tuning...I think

« on: May 26, 2013, 05:41:06 PM »

This is probably related but what could be causing the following in the attached picture?

In the bottom cut zero was just above the plywood surface and marked at 1st zero. As it cut the z got progressively deeper a small amount each line until it plunged deep. Once I stopped it and hit go to zero it moved to the spot marked zero after and was buried in the wood.

2nd try at cutting I lowered the Z velocity and let it go. It was still cutting just barely deeper each pass until it plunged and continued. When I sent it back to zero it went to the spot marked zero after and again buried in the wood. It did not run as far before unexpectedly plunging but I expected it to zero in the wrong place to the right of my 1st zero not the left of it.

Could it be velocity causing to to be off like this?

If so that still doesn't explain the plunging at random points in the same unchanged g-code file.

(edit: offending attachment removed, thread should be fine again - scottn)

55

General Mach Discussion / Re: I could really use some help with motor tuning...I think

« on: May 26, 2013, 05:40:43 PM »

Thanks Hood. I just hadn't changed anything in it while using it last time. I did right before attaching it this time.

56

General Mach Discussion / Re: I could really use some help with motor tuning...I think

« on: May 26, 2013, 05:20:11 PM »

I called it that so I would be able to switch to another one with a similar name if it didn't work. If it makes it less confusing I can remove the sergey part from the name of the file but it is the one I'm actively using

57

General Mach Discussion / Re: I could really use some help with motor tuning...I think

« on: May 26, 2013, 03:51:15 PM »

I'll paste what Sergey said after looking at my config file:

"Your axes settings -- those look totally bogus to me. First of all
motors turn very slow at their max speed. Something's fishy here -- either
steps per inch are wrong or maximum speed is way too low.

Acceleration, on the other hand, is simply astronomical No wonder you
motors are loosing steps. And it was kinda like infinite on Z axis so it was
supposed to go zero to sixty in zero seconds...

I put some rather conservative values there and made X axis a bit faster (Y
and Z are left where they were) so you could be able to test and compare
them.

For acceleration your first shot should be at axis accelerating from 0 to
full speed in something like half second. You can clearly see this time in
Motor Tuning dialog when you drag that horizontal "Acceleration" slider.
Then, if it worked, you can start gradually increase acceleration until your
machine started loosing steps. At this point you back off a bit and you have
your system set for maximum performance. The same is also true for speed."

58

General Mach Discussion / Re: I could really use some help with motor tuning...I think

« on: May 26, 2013, 01:47:22 PM »

He took mine and helped me modify it so I am using it. He fixed some things I had done and it is working better than my original configuration but it wasn't his file.

59

General Mach Discussion / Re: I could really use some help with motor tuning...I think

« on: May 25, 2013, 08:37:02 PM »

Hood, did it not attach?

60

General Mach Discussion / I could really use some help with motor tuning...I think

« on: May 25, 2013, 01:16:18 PM »

I recently received a Chinese CNC http://salecnc.com/catalog/product_info.php?cPath=21&products_id=59&osCsid=gosj62io17t8qoku4tp0ti1704 the XJ 1325.

I have switched over to Mach3 because of the endless issues I was having with their software and controller. I switched using a CENTIPEDE controller etc http://ksilabs.com/ and Sergey has gone above and beyond helping me switch over the boards, even helping me reprogram my VFD to work properly and I am 90% of the way there.

The problem I am having is I'm definitely losing steps so I need to tune but the Chinese salesman knows almost nothing about the technical aspects of the components. He was able to give me the steps, at least he says they are the right ones, but beyond that they are no help. And when I ask about Step Pulse and Dir pulse they have no clue what I'm even asking.

So far what I know is I have:

X & Y steppers are 96.01536 (they called them pulses)
I have two motors on the Y
Both X&Y motors are 86BYGH450B-060-15J and are 1.8 deg pitch
The Z step is 160, 1.8 deg pitch same motor part number but ends at the B. Nothing I can find shows this part number with nothing after it but the motor shows it is 4.3A 0.55Ohms  6.0mH

Sergey at KSILabs modified my XML and it is working a little better than what I had but on the last thing I tried cutting the Z cuts kept getting progressively deeper and suddenly plunged down about halfway through the board.

Any help at all would be greatly appreciated. I've had this ,machine for 3 weeks now and haven't been able to successfully use it yet.