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FAQs / X offset appears to change

« on: September 08, 2017, 01:13:18 AM »

I am setting up the machine and have noticed a problem where the X offset seems to change for no reason mid code.
I am  engraving a rectangle which is meant to be with corners at absolute points (7.5,7.5), (7.5,52.5), (92.5.52.5) and (92.5,7.5).
I am using Mach3 and a ethernet smooth stepper.
Points on the DRO of Mach 3 look correct but when I run the file. I cut what you see in the picture.
Steps taken are
1. Ref all home (using proximity switches)
2. Go to Zero indicated by the end of the ruler in the picture.
3. Run the file generated by Aspire
N110G00G21G17G90G40G49G80
N120G71G91.1
N130T6M06
N140 (V-Bit {60 deg 32 mm} )
N150G00G43Z23.999H6
N160S16000M03
N170(Toolpath:- Profile 1)
N180()
N190G94
N200X0.000Y0.000F900.0
N210G00X7.500Y7.500Z10.000
N220G00Z5.999
N230G1Z-1.50F900.0
N240G1Y52.500F900.0
N250G1X92.500
N260G1Y7.500
N270G1X7.500

The fourth edge of the rectangle finishes at about (15,75) but the DRO indicates (7.5,7.5) and if I issue a go to zero from mach 3 the tool moves to aproximately (7.5,0) DRO indicates (0,0)
Now if I repeat this complete set of steps the tool will travel the exact same path each time. If however I simply rerun the file without rehoming the tool will cut the complete rectangle only.
My original thought was lost steps on X axis (slaved) but it seems too consistent too be that. I would expect the number of steps lost would not be the same each time. Thoughts please would be appreciated.
The picture shows the resulting engraved rectangle after multiple itterations of the above steps.