O ring retention in groove 3

[tetwin11]

We want to use some small o-rings, probably -011 (OD .441", .070" thickness), durometer A70. There will be a c'bore in a plate in which the o-ring will be placed. We want the OD of the c'bore to be slightly undersized such that when the o-ring is placed in the c'bore, it will stay in place when the plate is flipped upside down (for assembly with other parts). Any suggestions on how to size the c'bore to make this happen?

 

[aroundhere]

depending on how deep the cbore is, just make the hole .015" under the od of oring size. The oring will stay. Take a peice of scrap alum and drill a hole and try it. keep it simple.

 

[Cockroach]

I presume the purpose for the o-ring is for a seal, HyTool. Why else the elastomer?

What I'm saying is that you could theoretically drill a c'bore of diameter 0.441, thus matching the elastomer OD, then stretch the o-ring. You will find this solution would work, in addition to my post.

The c'bore depth is the recommended value from Parker. I suggest following that for this application.

Regards,
Cockroach

 

[hydtools]

Cockroach,
Seal was be my first assumption, too, but that was not specified.
But could be for retention of something, or cushion for something.
We don't know for sure only that the o-ring was to be retained when the part is turned over.

Ted

 

[Cockroach]

Yeah, fair enough. Buddy went MIA, presumably he got his answer.

Regards,
Cockroach

 

[tetwin11]

Thanks everyone for your input. This is all good info and it will certainly help me come to a conclusion.