I'm hoping to start a CNC build soon, along the lines of this:
http://www.cnczone.com/forums/diy-cn...-next-cnc.html
I have been searching all over for linear rails and blocks, and I've read through the FAQ on them, and gather they're super beefy generally and often people go larger than needed. But, I haven't been able to figure out the difference between some of the letters yet, or between the medium duty, and heavy duty rail. For instance, on automationoverstock.com I've been thinking of either the AG, medium duty rails (either 25mm to get the length or maybe 25mm and look into a butt joint)
overstock & surplus automation products: Linear Bearings/Rail, Medium Duty Blocks/Rail
or, the heavy duty LG series rail (more expensive, and again, 25mm gets me the length with no splices, but smaller is cheaper):
overstock & surplus automation products: Linear Bearings/Rail, Heavy Duty Blocks/Rail
I'll start an actual build log soon, post some drawings and dimensions, and credit the other builds I've been pulling ideas from, but basically I want to build a fairly sturdy steel welded machine - probably 4" square tube, .25 wall frame, 8" or 10" tall gantry, again .25 wall, etc. so it will have some decent weight. NEMA 34s, geared down... any recomendations on the above rails, or known differences in accuracy between the two?
Dameronw