New CNC router 8x4 For Cutting Multiple Materials

[ciscoeuk]

Good to see someone using the spreadsheet. You'll find that if you change to similar size box section the deflection due to bending will be similar, but the bending due to torsion will be substantially lower. That's because the torsional stiffness of a channel cross section is very poor. Also put the rails for the Z-axis on the plate that moves up and down, so swap them round. It's much stronger this way since the distance between the supporting bearings and the tool is minimised. The best thing you could do to that design is loose the tall gantry sides, as they're invariably weak compared to the machine frame.

i take on board the board the issue of u channel and move over to box are recommending ali box on the y vertical as well

the z axis is one i pick off the net to try the nema 34 motor to see where i could put the pinion drive? my version is similar but to take a nema 23 or 34

the z axis i am building is using hiwin rails and a lead screw set up

can you send me a photo the z axis u spoke about please or threads

on the height, i need to clear 6 " 150mm from tip of router to base and some of what we intend to d, is carve forming plugs, ie engine cowls what do you suggest? as this cnc is going to be used got mixed materials,

hope to speak soon


ric