Quote:
Originally Posted by Joshua Sicz
We were finally assembling our linear side on Saturday and ran in to some trouble. We are using two 2 x 1 aluminum stock that the slides glide on. We have attached a bar in between the two slides. They move up and down as expected but what is happening is that with the slightest nudge of being off, not equally being pulled on each slide, they bind against the metal and stop gliding.
Thanks,
Joshua Sicz
Here is a picture of a slide and could post more later today if the desciption is not clear.
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In addition to the suggestions given, this is one way to look for binding points on a slide.
Extruded material has tolerances on variations in width/height/smoothness that can be large enough to cause binding at some points, but not others, in a well-built, tight slide assembly. One way to find these points is with a bluing ink designed to indicate bearing pressure. This is one of the best out there, and it is quite cheap:
http://www.artcotools.com/die-spotting-ink.html
The benefit to a dye like this is that it doesn't just show contact...it shows pressure points by areas of lighter and lighter blue. Just smear an even coat on your tube, run it through your guides in a way that causes it to bind, and it will show you where the tight spots are.
This is the stuff they use to check tight fits on machine tool parts.