John's Alu Profile build

[Evengravy]

Hey jazz. I mainly did it this way to have a nice level surface to measure from to align x travel but you're right, it's not the most efficient use of epoxy for sure.

I've spent quite a bit of time aligning everything.

Front to back I'm within 20 micron on the left Y rail (measured rail block to epoxy) in the right side within 50 micron. If I were to do it again I'd cast the y rails as raised concrete sections as you say jazz. It'd be closer then. The error is coming almost exclusively from the profile, but, I'm happy enough. I'm going to try hand scrape the alu Y rail on the right hand side to get it down to within 20 micron. It's bowed up 50 micron in the middle of travel. Not a massive amount but can be improved a little. These figures are front to back, in smaller areas the accuracy improves significantly.

On the X axis I'm within +/- 5 micron left to right so all good there. At those levels I'm reaching the limits of my measurement tools/technique.

I'm planning to drop a cast Alu plate on here fixed with threaded anchors soon ish. But I want to get the alignment as close as possible before I do that. That's really why I epoxied the entire top. Maybe not the ideal (cost effective) way but it gives me peace of mind when measuring. The project is on hold atm as I get the electricity supply sorted so will pick it up again soon. I'll really need to insulate the space too given the weather has gotten so wet here.

Comments are bang on though, could be done more efficiently and if I were to build again I'd cast the Y rails from concrete. Basically I had these already done and the thing running before designing the base so didn't want to start again redesigning bits, but so far it's working out alright. It's a learning experience so I expected that to be honest.