Does radial runout change as the router heats up?

[Aiph5u (Aiph5u (not affiliated with Onefinity))]

Hey Kyle,

yes but with a 80 mm spindle (which clears the stepper) you don’t have to slide the spindle that much downwards like you have with the trim router or the 65 mm spindle shown above. And this way you can have the cutter much, much nearer to the attachment point on Z Gantry (and subsequently on X Axis) thus decreasing the leverage force and the freedom of deflection:

@MikeH

Image: 80 mm spindle: Clears the stepper

@Kanova802

I agree with the added leverage on the spindle mount with the extra weight of the spindle itself and wires/hoses coming off of the top of the longer spindle motor. This would all cause higher deflection on the gantry rails compared to the trim router on top of the higher cutting forces you could apply with the ability to increase feed rates and use larger bits.

I don’t think the weight of the spindle and the wires/hoses is that relevant in comparison to the counterforces exerted by the milling itself.