My new 6040 improvement plan.

[m_c]

If you're going to do what I think you are, it won't have any effect on the X-axis deflection. The pivot point (the rails), and the spindle/tool, will still be in the exact same positions relative to each other.

It will make a difference to the Z deflection, however I'm not convinced it will be that great. The Z-axis, although using unsupported rails, is quite a compact and stiff assembly. Although changing things around will reduce the pivot distance between tool and Z-rails, I wouldn't expect it to flex that much anyway. Certainly not much in relation to the flex of the X-axis.

[PaisleyPCdoctor]

Thanks for the reply.

You are of course right, the pivot point and tool tip will be exactly the same distance so deflection will remain unchanged. However...

The mod will allow me to move the spindle (and tool tip) 35mm CLOSER to the pivot point (by raising the spindle motor 35mm in its mounts.

I'll work out the deflection angle and I'll be able to exactly predict (using distance to pivot point and angle) the deflection distance before and after.

I couldn't raise spindle any further without the mod because of tool reach.

[PaisleyPCdoctor]

Although... on thinking about it, I'm really just lowering the spindle one way just to return it to the same position another way.

My head hurts. Lol.

I'll need to do some more thinking. Good catch! Appreciated!