Quote:
Originally Posted by nuclearnerd
I've heard a lot of these rules of thumb for getting push to connect fittings to hold reliably. We've worked at trying to cut tubing square, pushing the tube all the way into fittings, and throwing out any batch of tube we thought was failing repeatedly. There's probably more we can do for quality assurance, but at some point I have to step back and think "there has to be a better way".
If barbed fittings reduce the id to much, another option is compression fittings with support inserts. https://www.mcmaster.com/#compressio...ubing/=151zg0i These should be more fault tolerant than p-t-c fittings, and more easily removed than barbed fittings. But it would strip be a pain to work with two wrenches in the confines of a robot chassis. |
I currently work for a pneumatic distributor a job I got from my involvement with FRC. I can honestly say that the push-to-connects leak about one time in a hundred, and giving them a shove solves the problem. I've never seen one fail, or break, and we assemble them constantly, even re-using them. We stock and sell Koganei, Pneumadyne, and Norgren fittings, and we used to distribute Parker. None of them have had this kind of issue. These really are the best, and cleanest, and usually, the most reliable attachment method.
Who made the tubing that you use? If it's too soft, it can start to deform, and refuse to seat. I can recommend Freelin-Wade very highly.