fine

Did you follow the video, and used a measuring stick on the tip of a vbit? this is important!

dont forget "50 on your tape measure is 500mm"

if you did follow this video

then its the problem is in v-carve, make sure that one of the first 20 lines in the finished gcode from V-carve has a G21 command (for mm) (G20 for inches)

the G21 line in my gcode looks like this

N160G00G21G17G90G40G49G80

without the colour red

if its there in the finished gcode then check again the distances again in v-carve

50 on your tape measure is 500mm

Thanks.Will take a long look and get back