Multiple syncronized spindle question.

[Dncnorthwest1-at-aol.com]

Hi, 
has anyone worked with a multiple spindle machine with separate spindle 
offsets and a synchronized movement of the spindles? This would entail an 
offset for the tool length and the z axis of the fixture offsets, and then 
slaving the spindle motions to the common z motion. This could allow for 
things as simple (relatively) as mounting a pair or more of Bridgeport BOSS 
series heads to a TEE Ram and making a small multi spindle production machine 
with multiple tool capability, or to retrofitting a larger machine. 

Along those same lines, has anyone played with using hydraulic servo valves 
to retrofit a tracer mill. Considering that tracers are almost unwanted in 
most shops, can still produce good finishes and come with one to six heads, 
they could be a great source for experimenters.  They usually can be found 
with two axis table cylinders and a knee lift cylinder. If the tracer valve 
goes out, the cost of repair often makes them unattractive if the shop has 
any CNC's.

Any feedback or ideas would be welcomed

Fred Harmon