Hi Jonathan,

Thanks for the Z axis motor info. It has been many years since I looked at the data for the Z axis motor so I will check it when the time comes and follow your advice accordingly.

I hear what you are saying about cutting aluminium and the feedrates / driver requirements, and that in itself it does not justify an upgrade. My experience has been that cutting aluminium on the MK2 machine (which is about to be replaced with my MK3 machine, details to follow) was a bit hit and miss with aluminium sticking to the tool and lots of vibration etc due to the wooden gantry sides (!) and unsupported wooden bed (!). The new machine should be so much better structurally that I felt that to make best use of it overall I wanted to match it with better drivers and that was really driving my questions.