Tried what you said and i can repeat it accurately for movement to 1000mm but when machining again its out by .3mm. This is strange.

may I kindly ask anyone to write a simple code for a square that measures 50mm x 50mm at 2mm deep with a 6mm endmill, zeroed bottom left corner. may be worth seeing if its a coding error from Artcam when being created

Try this.

Tweakie.

thank you sir, will try it later today after work. much appreciated