Is there anyway of increasing the maximum permissible material size (290x170) in Mill CAM Designer?
Have a look in C:\Denford\Config
Edit FanucM.ini with Notepad (or any text editor)
Search for your machine (Triac ?)
Change the appropriate values as shown here:

Edit FanucM.ini with Notepad (or any text editor)
Search for your machine (Triac ?)
Change the appropriate values as shown here:
[Triac PC (metric)]
Library=C:\Denford\Libs\FANUCM.SLB
Extension=FNC
Metric=1
Max Material Length=290
Max Material Width=170
Max Material Height=100