Quote Originally Posted by PaisleyPCdoctor View Post
I see what you mean about it moving away from wheels, but that would take a lot more force and I don't see how it would happen. The workpiece can only push from the very bottom.
I think you underestimate how little it takes to produce chatter

The supported rail was my plan, but I seen the guy on YouTube done it and it didn't help at all. Maybe with the fat backplate though. The way the ballscrew is attached to the bearings just now make it look like a big job. I'll need to have a good think how to do it though.
Again, the supported rail that you are thinking of is not what I suggest. Supported rail is barely better than round rail... What I am suggesting is profile rail. Everything else you do without doing that is just really little more than pointless.

BTW, I'm still using the machine in between mods. I did specifically buy it with intention of modding it and learning. I knew the weaknesses when I bought it, if anything it was a lot better than I'd expected. I didn't get disappointed. It's a hobby machine. I'm hobbying.
Good, and I applaud garden shed engineering - it's quintessentially British. Even so, there is limited value in repeating the mistakes of others that have gone before you. One of the great things about our species is the ability to progress based on prior learnings of others rather than being doomed to constantly be stuck in a cycle of repeating the same failures... There is a reason why anything above the absolute most entry level machines use profile rail across hobby/industry and it's not because they weren't creative enough to come up with weird and wonderful solutions like wheels.