Thanks guys,

Geoffrey, If im correct, I think you mean allowing the shank (the part without any cutting edge) to be a few mm into the material on its last pass, so long as the shank is the same diameter as the cutting diameter. I had considered this but was not sure if it was possible... might open up a few more purchasing possibilities. Do you not experience any burning, or is that not something that would happen in materials like MDF or Ply? Interesting you mentioned ply as Im thinking of buying a few sheets and trying those out too.

The machine I have on order is the Heiz S-1000... would have liked to stretch for the faster T series but unfortunately, my budget is restricted, compounded by the fact that I am having to purchase software and WINPC NC USB.

Here is the link to the information supplied on the website I purchased:
Prototools Prototype in House - Heiz S-1000 CNC Machine (with 5-Channel Controller)
Cheers Guys,
Luke