Thanks for your replies - this is all good information which will save me wasting money on an inadequate tool; although it looks like I need to extend my budget.

In terms of sturdiness I had considered a machine like the Sieg SX3 Mill from ArcEuro Trade, but for my dial making needs it wouldn't be able to cut a large enough area. I'm looking to engrave items up to 300mm x 300mm.

Is there a potential machine/model make I should be looking at which might give me an idea of budget or ideas for a design to make one?

Wal, what machine have you used for your work above?