Driving the gantry on Z axis?

[Boyan Silyavski]

Maybe all comes from fact that he holds the spindle with only 1 bracket and is not using water cooled spindle with steel body. But you could definitely hear on second video that when digs in material, something vibrates. Or if he is using short hiwin blocks the overhang of all is a bit too much, or mixed effect of all this.

See below, i try to illustrate what i was talking about, using a drawing i am still working on:
-if there is a second spindle bracket the spindle itself strengthens the Z
-weak spot is in yellow, where spindle pushes at first, its so short and in between 2 pairs of long bearing blocks so its irrelevant, so all force transmits to the upper bearing pair, instead of the plate itself.
I also have a feeling that the initial push at that short yellow distance eats all vibrations instead transmitting them to gantry

- then spacing of gantry rails must be same as when spindle is at its lowest point, so it balances the arm of force, see black line

So seemingly very simple thing could be very strong if well designed. Somebody could say it needs further bracing, but not. This design is tested by me in first build and works like a charm routing aluminum fully extended without problem. See video at end of first build where 0.8kw spindle makes 1.5mm pass fully extended without a glitch. See that there is a moment of scream when digging downwards, that because the lack at that moment of sturdy table bed