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Author Topic: Motor tuning calculations  (Read 16220 times)

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Re: Motor tuning calculations
« Reply #10 on: April 24, 2009, 11:34:08 AM »
Well, installed win2000 .. same problem .. re-flashed the drives to make sure the drives are set to 1/2 step ... x,y double the distance .. z is correct.  I am now at a complete loss to figure this out.

Re: Motor tuning calculations
« Reply #11 on: April 24, 2009, 12:19:22 PM »
What happens if you swap the step and direction pins of the z and say x axis in the port and pins configuration? Does the error switch to the x axis then?
Re: Motor tuning calculations
« Reply #12 on: April 24, 2009, 04:41:32 PM »
The issue remains the same when I use the setting of 4000 steps.

I have now made sure with the manufacture of the controller and driver that it is going from full step, half step, quarter step and 1/16 step.  It does work as it is supposed to ... ie move an 1 inch it does.

The problem lies with Mach3.  How do I make sure that the 1:1 ratio is working or engaged ... it looks like it is turned off ... not sure if this would cause the problem or not.  Somehow Mach3 is not working as it should be or at least how I think it should be with the way it is configured.

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Re: Motor tuning calculations
« Reply #13 on: April 24, 2009, 04:47:06 PM »
So you are saying that you have changed the pins for X and Z around in Mach and the X is still wrong and Z is still OK?
Hood
Re: Motor tuning calculations
« Reply #14 on: April 24, 2009, 05:55:22 PM »
Okay here goes ...

Units = Inches
Stepper motor - 200 step / rev
Driver - 1/2 step -
Lead Screw - 10 tpi
X,Y Steps set - 4000 - no gear just ball screw
Z Steps set - 7000 (turns a worm gear)

Before the reformat ... I took the Z Drive and interchanged it with the X Drive ... no settings changed .. X Drive doubled ... and the Z Drive did not.  Now I changed the motor pins around X over to Z ... changed the steps from 7000 to 4000 and it still doubled the distance.  Changed the drive wires back and rechanged the Z to 7000 and it doubled the distance.  Conclusion resulted in a fresh install.  Same problem ... tried the non-locked down version same thing.  From there I reformated the drive thinking that it is a Windows problem ... nope the problem remains.

The drives are optically isolated and are programmable for Full Step, Half Step, Quarter Step or 1/16 Step
They are flashed for 1/2 step and have been verified to be this ... If I change to 1/4 step or full the issue remains the same which is that it doubles the distance. 

Since I have formated the hard drive with Windows 2000 the Z axis now also must be set to 3500 steps in order for it correctly move the distance.

Ratio's are working.
The driver test comes out excellent from 25 to 100 ... I have tried 25 , 35, 45 with a restart of Mach with each change.




Re: Motor tuning calculations
« Reply #15 on: April 24, 2009, 05:58:19 PM »
I have run into the same thing on my Bridgeport. I have 200 step per rev steppers and 5TPI ball screws = 1000 steps per inch.
I have to set X & Y to 2000 steps per inch and Z to 1000 steps per inch to get correct moves. In the AHHA software all axes are 1000 SPI.
Darrell
Re: Motor tuning calculations
« Reply #16 on: April 24, 2009, 06:14:28 PM »
Well thank @#$%@#$ I thought I was going insane and maybe lost to many brain cells along the way!  I can now see that I am not the only one that is having this issue.  I drop the setting down but I fear that in the middle of a part it might just then decide to correct itself.

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Re: Motor tuning calculations
« Reply #17 on: April 24, 2009, 06:17:04 PM »
Darrel what version of Bridgeport was it?
Hood
 

Edit, I am presuming it still has the original BOSS drives?
Re: Motor tuning calculations
« Reply #18 on: April 24, 2009, 06:35:38 PM »
It was a BOSS5 and yes I am still running the Bridgeport SMD and ACC boards using an interface board that takes step and direction and converts to what is being called "Wave Drive" here.
What is puzzling is why Z is still 1000 steps and X & Y are 2000 steps when with the other software all are 1000 steps.
The driver can't be sending 2000 step pulses per inch or the mill would be moving 2 inches and there is no 1/2 step setting available.

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Re: Motor tuning calculations
« Reply #19 on: April 24, 2009, 06:39:53 PM »
Not sure if Boss5 was half step or not, mine was a Boss6.1 (UK version of Boss6) and it was half stepping. Was just wondering if some way the AHA knew that and put out pulses accordingly.
 I have a doc somewhere that has the specs of most of the BOSS versions so will look see if I can find it.
Hood