My new 6040 improvement plan.

[Desertboy]

So you went with 2x15mm hiwin on your x axis?

I was looking at my machine last night and weighing up the options. I think I can potentially leave my ballscrew and 20mm shafts on and ADD a 15mm hiwin, possibly 2 hiwin. Sounds crazy, but actually looks easier.

My main worry with the 15mm rails- spec says the attaching holes on the trucks are M3 threads. Is that right? Seems a lot of force for 4x M3 screws to handle.

They're M4's at least my original Hiwin's and the clone rail I linked to are M4, the carriages are also M4.

My spindle mount actually bolts through the mounting plate and directly into the Hiwin's.

My X is 1.2m original Hiwin's, Y is the 1.5m clone rail I linked to (I only paid £99 but they are still a bargain at £120) & Z is 45cm Hiwin all 15mm

There's 90 T nuts holding the 1.2m and 1.5m to the extrusion with M4's you have no issues the extrusion will fail before the bolts lol.

Stainless steel bolts are not strong, high tensile are much much stronger next time I will use high tensile and they are cheaper to boot.

I've destroyed so many M4 A2 stainless bolts the caps round off so easy.