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Author Topic: Incorrect movement for X & Y  (Read 1256 times)

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Incorrect movement for X & Y
« on: January 13, 2017, 02:50:56 AM »
Hi guys, new to here and hope you all are having good time.

Back to my question, I have recently built up my first 6040 3 axes machine and it was working fine in the past few weeks!
Somehow I don't know since when the X and Y axis are actually not moving fully according to my command when I set zero at and different location within the working area. It has no problem if I start from the zero of machine coordinate after "Ref all".

Once I set zero for example at x100y100, then I type in command g0x10y10 then the machine will go to 9.9992 on either or both axes.
If both X and Y also stop at 9.9992 then when I click "go to zero" then they will back to the zero point.
If one of the axes did go to 10 after the command, when I click "go to zero", this axis will come back at 0.0008.

I didn't have this problem before but somehow it starts to play like this!
Since it constantly has the 0.0008 but not a different value therefore I believe there may be a setting issue?
There is no problem for Z axis.

I hope the explanation is clear enough and please help on this issue.

Thanks in advance!
Cheers!

Re: Incorrect movement for X & Y
« Reply #1 on: January 14, 2017, 03:25:29 AM »
Anyone has something similar before?

Offline Tweakie.CNC

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Re: Incorrect movement for X & Y
« Reply #2 on: January 14, 2017, 03:42:46 AM »
Your machine will only move in increments (resolution) determined by the step size of your motors (set in Motor Tuning) and those are the increments (multiples) displayed by the Mach3 DRO's.

What is your X and Y axis step size and are you set-up for Inch or Millimeter units ?

Tweakie.

Success consists of going from failure to failure without loss of enthusiasm.  Winston Churchill.
Re: Incorrect movement for X & Y
« Reply #3 on: January 14, 2017, 04:35:17 AM »
Hi Tweakie!

Thanks for your help in advance!

The steps are 1281 for X and 1284 for Y and 1600 for Z.
I used to have something similar before when I had a number of step with decimals, when I change it to whole number then it becomes normal that all 3 axes will go to zero at wherever I set zero from.
Somehow now it starts to have this problem again even the step numbers are whole numbers.

The unit is in mm

Actually when i first spot this the difference was 0.0036 somehow it now becomes 0.0008
(Z has no problem so far)

Offline Tweakie.CNC

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Re: Incorrect movement for X & Y
« Reply #4 on: January 14, 2017, 05:11:53 AM »
Your axis step size is < 0.0008 mm.

An error (however it is caused) of 0.8 microns (1 micro-step) is many times smaller than the accuracy of your machine so why worry ?

As an additional thought, check that your X axis and Y axis 'Step Low Active' state is set correctly in Motor Outputs (it is usually set Active Low).

Tweakie.
« Last Edit: January 14, 2017, 05:29:14 AM by Tweakie.CNC »
Success consists of going from failure to failure without loss of enthusiasm.  Winston Churchill.
Re: Incorrect movement for X & Y
« Reply #5 on: January 14, 2017, 06:18:50 AM »