Time for a Reality Check and encouragement to New builders.!

[JAZZCNC]

If all you want to do is build a good, functional, CNC router, then I absolutely agree with you, Jazz. For example, despite the fact that the usual minimum steel section that people seem to use is 60x60x5 - minimum! - my machine is built from 50x50x3, and it seems plenty strong enough to me. There does seem to be a lot of over-building going on. Maybe I'll be proved wrong later...

Exactly my point it's more than enough for 95% of DIY builds and you won't be proved wrong I'm 100% sure of that.

Swapping to mathematician/scientist, though, I can't help asking "How? Why? What?" In other words - that looks interesting, I wonder if...? We can apply scientific method to building CNC routers, or at least aspects of their design and construction, and maybe something useful will pop out. Or maybe it won't. Is it useful to suggest, based on what I see at present, that two thin layers of epoxy might be better than one thick one? But that one will be good enough for most practical purposes anyway? You are also quite correct that I don't know exactly how accurate my measurements are, although in the best scientific tradition I've described how I made them, and also tried to double-check the method.

Nothing wrong with Scientific and taking measurements etc but completely pointless if it can't accurately be verified and at this size of machine then it can't be with a spirit level and tape measure!! (Making a point not having a go at you there.!). . . . BUT I can tell you what will tell you 100%.? Cut something with the bugger.!!

If it's out then it will just mean simple case of shimming or adjustment if you have had the good sense to build adjustment into the machine.
This is what I mean about good design beating over building every time at DIY level. Also lets make no mistake we 99% of members are DIY level no matter what those up there own arse's like to think.