New cnc user software issues

HI,

i need some help setting up my new cnc machine.
i have a cnc 6040z machine (usb cnc controller) and have cut2d desktop software
I create the CAD and set up the tool path, but when i input the gcode into the controller the cnc is cutting the design around 1/3 (one third) to small?i.e i design a 300mm / 300mm box and when it cuts out on the cnc its cutting out approx 200mm / 200mm?thank you for any help in advance!

Please help.

I did not find the right solution from the internet.

References:
http://forum.vectric.com/viewtopic.php?f=18&t=26695
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Thanks!