Spindle too heavy?

[Jonathan]

Whichever way you tilt the machine, you're just going to transfer a component of the gravitational force on the Z-axis to one or more axes. If either X or Y uses a ballscrew, then you could re-orientate the machine to place the force on that axis, however that could cause problems if the stiffness of the machine frame in general is low, which seems likely.

Nah couldn't handle that either. . Lol. . . . . . But on it's side at 15deg angle would maybe work.? . . . . And I'm being serious.!!

If an axis is placed 15 degrees to vertical, the gravitational force will only be cos(15°) times less (i.e. 3%) than if the axis was vertical. However I think by 'on it's side' you mean have Z 15° to horizontal and Y 15° from vertical? In which case you've just transferred almost 97% of the Z-axis weight to the Y-axis nut...

As a very quick cheap short term fix you could try rigging a "bungee". G.

Yes, a bungee cord attached to the ceiling would be nice and easy - assuming the machine is fixed to the bench!

Springs will change their 'pull' depending upon how far they are stretched whereas a counter weight over a pulley would be constant at any Z position. If the weight was dangled inside a tube, that would prevent it flapping about.

Whilst it does give an even force, the annoying thing with that approach is you're adding even more mass (about 5kg to cancel the new spindle) to the gantry [Edit: Not thinking.. this doesn't apply as you can attach the pulley to a stationary point, i.e. bench the machine is upon], so the X and Y axes are going to wear out even faster. You could start cascading pulleys to reduce the mass, but that introduces other problems...