Fully supported linear bearings - Radial squareness

[Neale]

Thanks Clive, I dont have an issue with switchmode PSU's. As a worst case i'll make a quick back EMF circuit and put some filtering caps across the bridge.

Not quite sure whether you mean you'll use a switch-mode supply or not. However, the linear supply is often better to drive steppers; the duty cycle of the load is relatively low, even though the peak demand can be high. With a SMPS, you need to rate it for max peak load to avoid it going into current-limiting where a linear supply can handle the peaks even if rated for average load. But then, you can buy cheap SMPS from China...