Hey everyone, I am looking for some help on sourcing the correct O-rings! The ones I purchased seem to be too thin. I had the 2in non-locking flange milled out of Delrin. I also purchased 2in ID acrylic tube from Tap plastics and then bought the acrylic ends from Blue Robotics.
I sourced several kinds of Orings- AS568-133 and AS568-30 from The-Oring store, but they all seem to be far too thin to seal the flanges into the acrylic.
Any recommendations on where to get the properly sized O-rings? Or if there is a better size? Thanks so much for your help!
Hi @hbaxworks -
Welcome to the forums!
Assuming the tolerances of your machined flange is correct, you can find the o-ring sizes on this page, which announces the non-locking design has been retired.
The -030 is the size you should be using! When tightening the bolts holding end-cap plate, you should be able to see the o-ring compressed flat against the clear acrylic plate.
If the -133 size used in the radial seal is loose, the tolerance of the ID of your sourced pipe is likely the problem… Does your tube from Tap plastics have a 2" ID?
Hey Tony- thanks so much for the help. Yeah, something doesn’t seem to be correct with what I have. I’ve checked the tolerance on the milled part and it matches the CAD file.
These are the O-rings I have been trying to use, seems like I got the right models?
and
I am using this tube from TAP since the tube from the link on Eplastics was out of stock at the time.
Any suggestions?
Hi @hbaxworks -
Is it the face seal or radial seal that you’re having issues with? Checking the measurements with a set of calipers is all I can think of to recommend! After all, the only part from Blue Robotics is the flat acrylic end cap plate, correct? Which tolerance did you check? What is the depth of the face-seal o-ring groove? Do you have pictures?
If the face-seal is not visibly compressing the o-ring, then your channel has been machined too deep…
