Art,
Looks like you've come a LONG way and taken the plunge!
I think you have a very good foundation for a machine there. You just need to stiffen it up. AL extrusion is a good bolt-on for stiffening things up. The carriage is just too flimsy for the type of work that you are doing. 4pcs of AL extrusion in addition to your cross bars is needed to prevent deflection. Most of your problem with deflection appears to be in the main car & not so much the Z axis.
-Brady |