Well guys on the a axis that lays along the x I designed it and had a friend with a machine shop build it. It is a simple transmission based on timing belts and gears. The problem was when I finally got it working there was not enough holding torque and my part would twist out of the way when the cutter made contact. Part of this was a design error and part was the simple fact I designed the 4th axis to save on high dollar wood, which took center of mass considerably off to one side.
The b/c head combination can be found from a couple of suppliers. One is Donny from Whiteriver who makes them like Rab made his for his 5 axis using the sat drives. He can provide some pretty heafty motors for the two heads as well.
The other is Colin Doughty who lives in New Zealand and has designed a nice system where you can buy one head at a time if that is all you need. You can find both sites here by searching for 5 axis and looking for the name hodarthestrange (Donny) or searching for a link for Colin. If you can't find it post back and I'll try to find them for you.
Mike
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