What's the diameter of the rod?
With a heavy Z and a full sized router, you'll want to keep that axis pretty short or use some big rod (Think 1" dia or more for that 28" span). I'm running a 20mm usupported rod on my 24" Y axis and using a rotozip as a spindle. I can deflect the y axis very easy. If I had a full sized router on there it would be rediculously amplified.
What'll happen is that router doing any kind of heavy cut will shake the Sh!t out of the Z which will cause torsional flex of the Y axis...
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Nathan |