I can't help but think there is a multi-member cart-wheel deal possible here. The trick is it would involve probably 3-6 people to pull off, maybe some straight across trades for some, some cash outlay for those with no machines and probably cash coming out for others.
As a for example.... I have a CT054 knee mill (6x26).... which is my go-to manual mill. I like it a lot, but it is a tool that can be replaced. I also have the room/space for a larger machine (bridgeport clone) but I'm not actively out 'looking' as I don't have the cash to outlay. I know of several members that have spare universal mills that I would be quite happy with, but it means moving a mill out in order to move a mill in...... My problem is that I don't want to be without a mill for very long, so selling, sitting on the cash and 'waiting' for a new machine does not appeal to me. so I stay with my ct054.....
I'm not sure how many of your have played 'settlers of catan'. Its like the trading scenario there -- I have 2 bricks and I need 3 sheep, who wants to trade. Sometimes you have to trace 1 brick for a rock, and a brick/rock for a wheat to get the sheep.
My musings of the morning.