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X and Y off by .080
« on: November 01, 2013, 09:43:20 PM »
Hi All,

I noticed a problem last night, I don't know that it is a Mach3 problem but thought I would start here. After setting the XYZ zero for a part I loaded my GCode and cut the part, milling some holes and a square in a piece of alum. The placement of the cuts looked off so I checked with a caliper and the X and Y were +.080. I tried reloading the Gcode and resetting the XYZ zero several times and the xy were still off. I was able to reload it one time and the xy were correct so I ran another test and it worked fine. Then I reloaded and reset again to test and the xy was off again.

Today I loaded a different GCode and noticed the same thing, the XY was off by +.080 (approx.)
I'm not sure where to start looking.

I'm using BobCAD V25, Gecko G540, Mach3. I was using an .125 end mill.

Suggestions? I can post the Gcode or anything else needed.

Thanks,

Chuck

Offline Hood

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Re: X and Y off by .080
« Reply #1 on: November 02, 2013, 06:27:15 AM »
It all depends on what you are meaning by "X and Y off by .080"
If you are meaning sizes are too big then probably your steps per unit are wrong.
If meaning the position when you return to zero is off by that amount then likely you are losing steps so you should reduce your acceleration and velocity.
Hood
Re: X and Y off by .080
« Reply #2 on: November 02, 2013, 10:34:15 AM »
try homing after you load your new code.
Re: X and Y off by .080
« Reply #3 on: November 02, 2013, 02:54:32 PM »
My work piece is 2.5" x 24". The 2.5" being X and 24" being Y. I'm trying to cut a 1" square in the middle of X. If I set XYZ to zero then manually jog the bit to the center of X on the work piece itself in MACH it is actually -.080" short of the center line. Same thing happens in the Y direction. In the Y direction it does not matter if I jog the bit 4" or 20" MACH is still -.080" short of where it should be. If I hit the button to take me back to XYZ home it goes home just fine and returns to XYZ zero. I hope I'm making sense.

Offline Hood

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Re: X and Y off by .080
« Reply #4 on: November 02, 2013, 03:06:09 PM »
it does not matter if I jog the bit 4" or 20" MACH is still -.080" short of where it should be.

That suggests that you have considerable backlash.
Hood
Re: X and Y off by .080
« Reply #5 on: November 06, 2013, 12:34:40 AM »
Thought I would post back. This was a blunder of my own... I was using my 1/8" end mill bit as my touch probe and it was off. I put in a solid 1/4" pin to use as a touch pin and all work fine. Sorry guys, chalk it up to being newbie...

Thanks for the help

Chuck

Offline Hood

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Re: X and Y off by .080
« Reply #6 on: November 06, 2013, 03:20:17 AM »
Thanks for posting back, too many people do not post back saying they found the issue and no one ever knows if there was a resolution or not:)

Hood
Re: X and Y off by .080
« Reply #7 on: November 06, 2013, 03:00:01 PM »
Thanks for posting back, too many people do not post back saying they found the issue and no one ever knows if there was a resolution or not:)

Hood

No Problem, I live on forums and know what you mean.

Chuck