oring groove size

[swcaddesigner]

Using the standard Parker Oring design catalog (yes, I still use one) It tell you everthing, piston size, groove dimensions, etc for a std 9.000 bore. I am slightly non-standard. 9.125 bore. How can I re-size all the values and still hold a vacuum?
Any help would be appreaciated.

 

[btrueblood]

1) Calculate the stretch of the O-ring installed at the over-sized groove diameter. 2) Calculate the reduction in section diameter due to stretch. 3) Calculate the new bore dimension that will give the same squeeze as the book values. 4) Test and verify, refine as required.

 

[Clyde38]

Search of forum provides

http://www.eng-tips.com/viewthread.cfm?qid=259837&page=1

and more. .

[link

http://www.linkedin.com/in/clydehancock

]

[/url]

 

[swcaddesigner]

Thanks btrueblood & clyde for you reply.

Still have issuses with oring groove size.

The 9.125 bore is fixed. I can make the plug and groove diameter anything that holds a vac seal. I also would like to use a standard oring. Maybe a 446?

I have used the on-line calculator but the values do not make any sence.

Any ideas? I really hope not to use a custom oring.

Aay help would be greatly appreciated.

Lost in the groove.

 

[israelkk]

You can use O-ring 446. You need to learn how to use the Parker Hannifin Inphorm for O-ring calculations. Use the "Exact gland" option and play with the gland diameter and tolerances until you receive the desired minimum squeese.

 

[swcaddesigner]

Hey Guys,

You saved me. Thanks for your advice and help. I used the Parker calculator and obtained the info.

Thanks again.

 

[kevindurette]

I'm a day late and a dollar short, but for anyone reading this later, I second the Trelleborg tool, for what it's worth.