Messages

1

General Mach Discussion / Re: Backlash on X axis changes to A axis

« on: November 02, 2017, 07:54:54 AM »

Hi Craig,

I've been busy these days and I could not try to do the last changes until this morning. I've made the changes on the SW1 DIP switch and also modified the other switches to set them on 8 subdivisions (plus the pertinent mod to the mach3 parameters following your instructions) and now the CNC works without the problem!!! I'm very grateful for your help and explanations 

Thanks a lot

Marçal

2

General Mach Discussion / Re: Backlash on X axis changes to A axis

« on: October 25, 2017, 02:24:09 PM »

Hi Craig,

Thank you so much for your indications. I sincerely appreciate the time you have spent answering my questions. I wish I could return you back the help in some way...

Tomorrow I will do this last changes and see what happens.

Marçal

3

General Mach Discussion / Re: Backlash on X axis changes to A axis

« on: October 25, 2017, 10:00:42 AM »

I forgot to post the DIP picture, sorry about that.

4

General Mach Discussion / Re: Backlash on X axis changes to A axis

« on: October 25, 2017, 09:59:25 AM »

Hi Craig,

Thank you so much for your detailed response! Now I understand a little bit more about the microsteps functionalities.

I've done the ballscrews mesurements and the axis moves 10mm after 1 complete turn (it goes directly connected to the stepper motor without belt or reduction). I posted the CNC manual and also the picture of the DIP switches (there are five of them with the same configuration), I hope it could be useful.

This is a little video that shows the "strange movement" of the A axis when I move the machine, hope it could help.
https://www.youtube.com/watch?v=ysElljIiJXo&feature=youtu.be

Thank you again for your help,

Marçal

5

General Mach Discussion / Re: Backlash on X axis changes to A axis

« on: October 25, 2017, 04:57:36 AM »

Hi Craig,

I've assigned the A home to pin 12 and also I've disabled the probe input and outputs #2 & #3. At the moment the problem persists.

The number of steps per mm was set on 40 when I purchased the machine. The number of microsteps are 2500.2 (named "units per minute" on the program) if I'm not mistaken.

The first test I did was switch X and A plugs on the electrical box, and the issue changed from A axis to X axis. Following your instructions I put together both pin wires of X and A axis inside the X plug and the machine moved without that "backlash/ back movement" on A axis.

Thank you so much,

Marçal

6

General Mach Discussion / Re: Backlash on X axis changes to A axis

« on: October 24, 2017, 06:04:39 AM »

Hi Craig,

I have checked and A axis is slaved to X. I also made the wire changes and the stepper motors behave identically. Could this mean that maybe the problem is in somewhere of the software?

I send the xml file (Ventura.xml) and some pictures of the electrical components. The motion controler is a USB box with all the electrical components inside.

Thank you so much,

Marçal

7

General Mach Discussion / Re: Backlash on X axis changes to A axis

« on: October 24, 2017, 02:27:09 AM »

Hello Craig,

First of all, thank you for your response. I've checked the backlash option on Mach3 and all distance settings are on 0 and the <Backlash Enabled> option is unchecked.

I attach a couple pictures of the A axis ballscrews and also the <Ventura.xml> with the CNC configuration. Hope it can be useful.

Thank you so much for your time,

Marçal

8

General Mach Discussion / Backlash on X axis changes to A axis

« on: October 23, 2017, 08:22:38 AM »

Hi there! This is my firs post, excuse me if i'm postint in the wrong section...

I have some backlash in my CNC, and I don't know exactly what happens to the machine and what I have to do. The machine is 2 months old, and has been working perfectly since a couple of weeks ago.

The X axis of my CNC has two stepper motors (X and A) and has ballscrews in all the axis. When I move the machine along the X direction, it turns back aprox 6mm on the A stepper motor and then it goes to the correct direction. This happens the 95% of times I try to move it with the software, and it happens at every point of the table (600 x 600mm). If I change the Stepper motor speed the backlash is alwais the same. Both stepper motors of the X axis have the same speed and parameters, so I don't know what can be wrong. I was carving a little piece of soft wood and when I was moving the machine to take of the piece of wood I discover that backlash.

What makes me crazy is that I've tried to change the plug connection between X and A Stepper motors in the electrical box, and after do that, the backlash changes from A to X axis. This make me think that maybe there is some software issue that makes that problem on my CNC instead of beeing some mechanical problem, but I don't know what to do. I've reinstalled Mach3, and reloaded my original parameters in the machine but the problem goes on. I've also sent the electrical box to the seller and they told me that they checked it and everything it's ok. Now, before sending the whole machine with the electrical box and the laptop to the seller I want to try if there is something that I can do to solve this. Can someone tell me something to do?

Thank you so much and excuse my poor english  

Marçal