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I just received two 24” Lg pieces of Aluminum Channel 3x2-1/4” thk. Nice clean, extruded 6061-T6 with generous inner radius. After hearing how the pieces would cost me $250 from vendors in Toronto and Hamilton, I ordered the pieces from Millennium Metal in Kelowna, BC for $55 +45 for Canada...

Good use of that space under the bed !!

That is a pretty high degree of accuracy When we were inspection ground and lapped parts at Ex-Cell-O we would have stacked gauge blocks with a dial indicator on a marble table to verify those dimensions. Maybe @slow-poke can provide some examples of his work.

You can try to message @Rauce he may have some extra parts.

FYI - Even brand new lead screws have some backlash. You have to learn to compensate for it. Don’t try to TOTALLY eliminate the backlash, a leadscrew without some play (backlash) will bind and gall the threads. The Ballscrew & Ballnut will also have a small amount of backlash. The solution is...

Prioritize your efforts. Your projects inspire me to try more !!

John, I was just suggesting where you could buy the Ball Screw components, but . . . your time is your own, so go for it !! If you have all the tooling in your workshop. I am still working on my ‘Linear Slides’, when I can get my hands on affordable material inputs.

Thompson and NSK did have some ‘nice’ preload able ball screws with screw brushes to prevent chips from getting in the balls.

It’s one of those ‘mysteries’ of the universe. LOL