Hello Guest it is August 12, 2020, 02:31:01 PM

Author Topic: X axes loosing steps, helps pls  (Read 3841 times)

0 Members and 1 Guest are viewing this topic.

Offline Robhi

*
  •  138 138
    • View Profile
X axes loosing steps, helps pls
« on: October 07, 2013, 06:51:58 PM »
Hello,

I have built a router for wood working, with servo motors, Y and Z axes are ok, but X axis is loosing steps when it accélérâtes a little bit.
I use geckos 320x drives with digital encoders 500 lines. servo motors KL34-180-90 and power supply of 72 volt.

X axes is working with  A axes as slave. pully 2:1 and screw of 10mm pitch.
Y and Z axes 3:1 and rhe screw is also 10 mm pitch.

the prblem is when the machine is cutting it does not loose steps, but when the z axes is up and it moves x axes fast it looses steps and motors bocomes jerking or something like that.

I usually use 500 for the feedrate .

I have attached my xml file, if it will be needed.

hoping to get your help.

thanks a lot
Robhi
 
« Last Edit: October 07, 2013, 07:04:59 PM by ger21 »

Offline ger21

*
  • *
  •  6,282 6,282
    • View Profile
    • The CNC Woodworker
Re: X axes loosing steps, helps pls
« Reply #1 on: October 07, 2013, 07:05:41 PM »
Servos don't lose steps. If it's losing position, it's probably a problem with your encoders.
Gerry

2010 Screenset
http://www.thecncwoodworker.com/2010.html

JointCAM Dovetail and Box Joint software
http://www.g-forcecnc.com/jointcam.html

Offline Robhi

*
  •  138 138
    • View Profile
Re: X axes loosing steps, helps pls
« Reply #2 on: October 07, 2013, 07:44:42 PM »
ok, thanks so much.
how could I know that? and what should I do to resolve the prblem?
thanks

Robhi

Offline Hood

*
  •  25,846 25,846
  • Carnoustie, Scotland
    • View Profile
Re: X axes loosing steps, helps pls
« Reply #3 on: October 08, 2013, 03:02:41 AM »
Have you tried a wider pulse?
Hood

Offline Robhi

*
  •  138 138
    • View Profile
Re: X axes loosing steps, helps pls
« Reply #4 on: October 08, 2013, 09:29:33 AM »
I have just tried it but there is no use. I put from 1 to five , but the problem is still the same.
I would like to to add another thing that may help. I have to power supplies , they are the same. I have wired the x axis to the first power supply, and the A (slave axes) to the other one. do you think the problem comes from ? should I power the 2 axes, X and slave to one power supply?

I have just tried it but there is no use. I put from 1 to five , but the problem is still the same.
I would like to to add another thing that may help. I have to power supplies , they are the same. I have wired the x axis to the first power supply, and the A (slave axes) to the other one. do you think the problem comes from ? should I power the 2 axes, X and slave to one power supply?

Attached some pics.
thanks

Robhi

Offline Hood

*
  •  25,846 25,846
  • Carnoustie, Scotland
    • View Profile
Re: X axes loosing steps, helps pls
« Reply #5 on: October 08, 2013, 09:44:11 AM »
You may have to start swapping ot drives and motors to see if the problem follows the swapped hardware.

Hood

Offline Robhi

*
  •  138 138
    • View Profile
Re: X axes loosing steps, helps pls
« Reply #6 on: October 08, 2013, 10:25:22 AM »
Ok I will try to do so.

thanks

Robhi

Offline Robhi

*
  •  138 138
    • View Profile
Re: X axes loosing steps, helps pls
« Reply #7 on: October 09, 2013, 08:41:55 AM »
I put 3330 in the velocity and 410 in the acceleration. it is ok and every thing is going fine. but it is not fast. I would like to have a little bit more speed. is there some thing to do for having more speed?

Thanks

Robhi

Offline Hood

*
  •  25,846 25,846
  • Carnoustie, Scotland
    • View Profile
Re: X axes loosing steps, helps pls
« Reply #8 on: October 09, 2013, 09:23:54 AM »
Just sounds like your motor may be too small for the axis or possibly the axis binding.

Hood

Offline Robhi

*
  •  138 138
    • View Profile
Re: X axes loosing steps, helps pls
« Reply #9 on: October 09, 2013, 02:29:59 PM »
Ok ,
Now I use pullies 3:1 and 2:1. My question is if I use pullies 1:1, what do you think, is it possible?
if not what kind of servo motors do advise me to have, which can be driven by gecko 320x?
thanks

Robhi