Welcome to the forum Sarah.

I can't help with your specific question but there are one or two here who can and I'm sure they'll be along shortly (JohnS?) as CNC is a hobby side for me. But with my other 'management consultant' hat on (and some experience as both exec and non-exec directors of high tech start-ups) I'm intrigued by why you want to buy machinery for a start-up rather than sub-contracting work out initially, and who is going to use these machines? Feel free to PM me if you don't want to discuss in a public forum.