Quote Originally Posted by Pointy View Post
Thanks for the reply Lee. My initial design uses 80x40 and 15mm plates, so it must have been a lucky guess.

I suppose the problem with using 80x40 is that the slot will be too big for the 15mm linear rails, without custom plates.

Regards,

Les
In fact, I'd use 90x45 or even larger. My current build is made up mainly of 90x45 and no regrets at all. Regarding the rails, I think it is in any case a good idea to install those on a plate, and not directly on the aluminum profiles. I am using 4mm thick aluminum pates between my (supported round) rails and the extrusions. Perhaps if I'd have flat 15mm rails I'd put steel plates between, not aluminum, but I think even aluminum is better than nothing.