Machsupport Forum

Mach Discussion => General Mach Discussion => Topic started by: brian98 on May 29, 2016, 05:55:16 PM

Title: A Axis not Rotary but Affected by Rot 360 Rollover
Post by: brian98 on May 29, 2016, 05:55:16 PM

I've configured my A axis as linear by unchecking "A axis is Angular" on the General Config page.  Nevertheless, when I give a code a move in the negative direction, the axis moves in the positive direction as if it were angular.  I have determined that if on the General Config page I uncheck the "Rot 360 Rollover" the axis behaves as I want a linear axis to do. 

Unfortunately, this means that I cannot use the Rollover feature on my B or C rotary axes.  This appears to be a bug in the Mach 3 software.  Does anyone have any comments or suggestions?

By the way, I have also found I can have the axis operate correctly as a linear axis even when the "Rot 360 Rollover" box is checked, but this requires going to Incremental Mode (G91) and out again every time I want to move in the negative direction.

Title: Re: A Axis not Rotary but Affected by Rot 360 Rollover
Post by: Greolt on May 30, 2016, 05:27:47 AM

I remember a conversation with Art Fennerty when he said checking "A axis is Angular"  does one thing and one thing only.

That is, it tells Mach3 to NOT scale the A axis DRO when changing from G20 to G21 or vice versa.  Nothing else.

So that would suggest to me you may be stuck with this particular issue.

Title: Re: A Axis not Rotary but Affected by Rot 360 Rollover
Post by: brian98 on June 03, 2016, 12:50:35 AM

Thanks for the advice.  Disappointing but at least there is a work-around.  I may see if I can build a "Brain" to do what I want.