Jon Elson wrote:
> Igor Chudov wrote:
> 
>>So, my question is, does EMC2 support "two Z axes" and if so, what
>>sorts of EMC2 facilities would I need for this. Different kinematics?
>>  
> 
> It would be much better to make the knee the W axis (auxiliary linear 
> axis parallel
> to the Z axis).  EMC2 has facilities to handle an extra set of Cartesian 
> coordinates.
> I think trivkins will still support this scheme, although coordinated 
> feedrate with both
> Z and W will probably not do anything smart.  In fact, I'd sort of guess 
> that any
> feedrates apply only to XYZ, and auxiliary axes will only move so that 
> they complete
> at the same time as XYZ.  This is probably all you want, anyway.  The 
> point is, I THINK,
> that a move in XYW will not compute the feedrate the same way as an XYZ 
> move.
> 
> Jon

On a completely mechanical note, be aware that the Z and W may not be 
parralel. If you feed Z then feed W you may end up with a bore that has 
a kink in it. I suppose you could feed both at the same time and get a 
diagonal bore. ;-) Didn't Stuart do something with something like this?  Ed.

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