Wobblycogs CNC Mk1

[Wobblycogs]

Funnily enough I asked Chai that exact question yesterday but he didn't include prices in his reply, just the drawings I asked for. I suspect something got lost in translation so I've tried again.

In the spreadsheet is the screw length the total length including the machined ends or just the portion between the bearings? If it's just the threaded portion between the bearings then I may be able to get away with 1600mm which puts me (just) into RM1610 + 23's category by the looks of it.

What I'm thinking is if I place the nut towards the front of the gantry and keep the rails at 1800mm then the gantry is free to move beyond the end of the ballscrew - yep, that's clear as mud so there's a couple of pictures attached showing what I mean. I've not seen any builds like this so I'm guessing it must be a bad idea but it looks like a simple way to keep the length of the ballscrew sensible and not lose any cutting length.