Aluminum Pulley and Steel C3 bearing
Hi all,
I am new here!!! ;cool;
I really really need help with aluminum 6061-t6 pulley I am working on. A steel bearing will be press fit into it, and supposrted by Internal retaining clips on each side!
I read a little about thermal expansion, difference between a metal and aluminum pulley. Metal has to be .002"(.051mm) and aluminum at least .003"(.076") I use the metric system, I find it much easier!
I am confused as to how small the opening of the aluminum pulley has to be?? I made a few with .0035"(.089mm) It was extremely tight to get the bearing in! More tight than the metal pulley! When it finally went in, the center of the bearing that supposed to turn was really hard to turn, as compared to when it is in the metal pulley, it is easier/smoother!
Any ideas?? What do you guys think??