Hello Guest it is December 14, 2019, 11:35:22 PM

Author Topic: Longs Motors CNC kit: need help getting motion  (Read 3102 times)

0 Members and 1 Guest are viewing this topic.

Longs Motors CNC kit: need help getting motion
« on: July 06, 2017, 04:39:49 PM »
I'm unable to get any motion from the Longs Motors version of a Chinese CNC kit consisting of 3 NEMA 23 motors, 36v power supply,  1 DB25-1205 BOB, 3 DM542A drivers, 1 parallel cable. There's precious little info on the internet other than YouTube and not much of that. Any suggestions will be appreciated. If unable to get a resolution, I'll go Gecko as I did on my last build which went beautifully.

Mach3
native units: inch
port setting: 1
motor outputs (x axis only):
   enabled (green check mark)
   step pin 3
   dir pin 2 (tried reversing step and dir)
   dir lowactive (red x)
   step lowactive (red x)
   (tried selection of green ck mark for both)

input signals:
   estop: port 1, pin 15, green ck, red x, 0 (hotkey)

motor tuning: used default settings and lots of others

DRO in Mach3 responds but motor does not. Anytime I change directions with the left arrow key, the motor clicks one time (one step I suppose)

Two YouTube channels using slightly different hookups are able to get motion. One channel is Franco, the other is Joe POPS.

This link shows my condensed version of both.

https://www.dropbox.com/home?preview=two+diagrams.PNG

Re: Longs Motors CNC kit: need help getting motion
« Reply #1 on: July 06, 2017, 05:59:18 PM »
Hiya, I have the exact Longs Motor kit that you have.  I had a few (self induced) problems myself but finally got it going OK.  I'm at work right now but will look at my settings to see if we can get it going.  What time zone are you in.  US I assume?  It's 5:00 PM where I am.
Milton from Tennessee ya'll.
Re: Longs Motors CNC kit: need help getting motion
« Reply #2 on: July 06, 2017, 06:01:07 PM »
It's 6p here EST. You must be CST. I'd really appreciate the help.
Re: Longs Motors CNC kit: need help getting motion
« Reply #3 on: July 06, 2017, 06:11:24 PM »
No problem; I'm definitely no expert but seem to muddle my way through most simple things with Mach (with a lot of help from the gurus here.)  I get out in the shop around 7:00 PM.  You may get an expert response before then as the Longs kit is pretty standard.

Are you using an XP PC, not a laptop?  Mach doesn't play nice with a laptop 3.3v PP.
Milton from Tennessee ya'll.
Re: Longs Motors CNC kit: need help getting motion
« Reply #4 on: July 06, 2017, 06:14:40 PM »
Yep, an old yard sale purchase so I'd have a parallel port. I built a machine several years ago and sold it. Getting back in now. I'll send you a link of my old one (sold it). I see you're in TN. Chattanooga here.

https://www.youtube.com/watch?v=LkJGr6z0Uns
Re: Longs Motors CNC kit: need help getting motion
« Reply #5 on: July 06, 2017, 06:24:21 PM »
Here's a video that may help:  https://youtu.be/5D7px0r0pUE

Follow this link for the wiring diagram:
https://www.dropbox.com/sh/xxpjtprlpwky10n/AAB8KWLZh5PpkDMDjZ1gXl6Sa?dl=0
Problem Solved!
« Reply #6 on: July 06, 2017, 08:47:53 PM »
Thank you everyone. I found the problem. I will post my settings in a little while so others may benefit. ;D
Re: Longs Motors CNC kit: need help getting motion
« Reply #7 on: July 06, 2017, 08:57:25 PM »
Cool, just finished supper & was about to post a suggestion or two.

Also the general section gets more traffic & your post would have been fine there.
Milton from Tennessee ya'll.
Re: Longs Motors CNC kit: need help getting motion
« Reply #8 on: July 06, 2017, 09:34:27 PM »
I'll remember that. Thanks again.