NEWS
LinuxCNC 2.5.2 Release
There are no translations available.

LinuxCNC 2.5.2 Update Released (changelog).
 
LinuxCNC 2.5.1 Release
There are no translations available.

LinuxCNC 2.5.1 Update Released (changelog). If the Package Manager does not prompt you to upgrade see this page.
 
LinuxCNC 2.5.0 Release
There are no translations available.

New major release (changelog). See the instructions to update your system from EMC 2.4 to LinuxCNC 2.5.
 
Home Forum Configuring LinuxCNC PnCConf Wizard My scale is off by a factor of 5?

Welcome, Guest
Username: Password: Remember me
Forgot your password? Forgot your username?
  • Page:
  • 1

TOPIC: My scale is off by a factor of 5?

My scale is off by a factor of 5? 19 Apr 2012 09:43 #19377

Hello,

I have just assembled my motors lead screw and sheaves
- motor 600 oz in nema 34 - ?200 steps per rev?
machmotion.com/cnc-products/drives-motor...n-stepper-motor.html
- motor sheave 72 notches
- lead screw sheave 32 notches
- lead screw 3/4-6 acme

I calculated this to be 0.0018" per step, PnCConf confirmed this under scale setup.
but when I try to test the setup it is nearly 1/5 of what it should be? ie if i tell it to go 10 inches it will go 2

Any Ideas?

Thanks for looking.
The administrator has disabled public write access.

Re:My scale is off by a factor of 5? 19 Apr 2012 11:07 #19378

  • PCW
  • PCW's Avatar
  • OFFLINE
  • Moderator
  • Posts: 1651
  • Thank you received: 87
  • Karma: 116
what kind of step drive and what are its settings?
The administrator has disabled public write access.

Re:My scale is off by a factor of 5? 19 Apr 2012 11:21 #19379

Its a gecko 203v with no resistor (7Amp)
The administrator has disabled public write access.

Re:My scale is off by a factor of 5? 19 Apr 2012 17:22 #19381

  • cmorley
  • cmorley's Avatar
  • OFFLINE
  • Moderator
  • Posts: 1488
  • Thank you received: 40
  • Karma: 89
doesn't gecko do micro stepping? if it does 5 time micro stepping then the scale would be wrong.
The administrator has disabled public write access.

Re:My scale is off by a factor of 5? 19 Apr 2012 17:51 #19382

  • cmorley
  • cmorley's Avatar
  • OFFLINE
  • Moderator
  • Posts: 1488
  • Thank you received: 40
  • Karma: 89
hmm gecko 203 does 10 x microstepping.
you need to account for that.
Inches per step would be .0001875
but the scale is what is important.
What scale did pncconf give you ? 5333.3333

But one would expect it to be 1/10 of distance rather then 1/5th - I wonder if something else is happening too...
The administrator has disabled public write access.

Re:My scale is off by a factor of 5? 19 Apr 2012 18:21 #19384

It gives me a scale of 533.3333333
The administrator has disabled public write access.

Re:My scale is off by a factor of 5? 20 Apr 2012 22:06 #19412

  • cmorley
  • cmorley's Avatar
  • OFFLINE
  • Moderator
  • Posts: 1488
  • Thank you received: 40
  • Karma: 89
then it seems you forgot to account for the micro stepping.
the gecko multiplies the 200 steps the motor has by 10.
The administrator has disabled public write access.

Re:My scale is off by a factor of 5? 22 Apr 2012 08:00 #19435

after fixing the scale it looks to be much closer now, thanks!
Last Edit: 22 Apr 2012 08:00 by vladilinsky.
The administrator has disabled public write access.
  • Page:
  • 1
Moderators: cmorley
Time to create page: 0.973 seconds
Powered by Kunena Forum
© 2013 LinuxCNC.org
Joomla! is Free Software released under the GNU General Public License.