Problem with unit conversion on rotational axis

Home › Forums › TinyG › TinyG Support › Problem with unit conversion on rotational axis

Tagged: , , ,

Viewing 2 posts - 1 through 2 (of 2 total)
  • Author
    Posts
  • December 18, 2013 at 8:45 pm #5090
    RustRacer
    Member

    Alden or Riley,
    I have a TinyG v8 with firmware build 380.08. I’m trying to use inches on the Y-axis (motor 2) and degrees on the A-axis (motor 4), so I’m running in inch mode. I was having lots of trouble getting the A-axis to move as far or as fast as commanded by a factor of about 25, and the position reported was also low by a factor of 25.4 (which tipped me off to the conversion thing). I have 100:1 gear reduction, so I set $4tr to 3.6 inches (yes, the Wiki says degrees, but the TinyG says inches). When I enter G21 to switch to mm mode, $4tr is reported as 91.44 mm (should be degrees). When I set $4tr to 3.6 in mm mode, the A-axis works as expected.

    So it appears that in inches mode, the TinyG applies the mm to inch conversion factor to the rotational parameters as well. Now that I know the problem, I can sort-of work around it, but it would be much better if this were fixed.

    Is this a known bug? Any plans to fix it?

    Thanks,
    Ben

    December 21, 2013 at 5:18 pm #5091
    alden
    Member

    Thanks for pointing this out. It does indeed look like it should work differently. We will add it to the known bugs for fixing.

  • Author
    Posts
Viewing 2 posts - 1 through 2 (of 2 total)
  • You must be logged in to reply to this topic.