O RING

O RING

This topic has 9 replies, 7 voices, and was last updated 17 August 2017 at 11:12 by JasonB.

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16 August 2017 at 18:03 #312350
Phillip weaver
Participant
@phillipweaver84697
WHEN USING A O RING THAT'S 1"X3/4X1/8 HOW DEEP DO YOU MAKE THE RECESS

Edited By JasonB on 16/08/2017 19:48:03
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16 August 2017 at 18:03 #25446
Phillip weaver
Participant
@phillipweaver84697
USING A O RING
16 August 2017 at 20:20 #312386
Dave Halford
Participant
@davehalford22513
You type o ring clearance into google
16 August 2017 at 20:22 #312387
mechman48
Participant
@mechman48
Dave beat me to it !

Geo.
16 August 2017 at 20:35 #312391
JasonB
Moderator
@jasonb
Problem is you will probably get an industrial standard from google, for model work the sizes are different so that teh ring is compressed less which makes for an engine that turns over more easily.

Assuming you want the groove in a piston then groove depth is 0.132" and width 0.166" wide.

SAE would be 0.124" deep and 0.188" wide which makes things a lot tighter but is meant for pressures upto 1500psi

Edited By JasonB on 16/08/2017 20:37:59
16 August 2017 at 20:48 #312396
HOWARDT
Participant
@howardt
What is the o ring being used for, is it static or dynamic, pressure, operating medium.
16 August 2017 at 20:56 #312397
vintagengineer
Participant
@vintagengineer
Also you need to keep clearances as tight as possible to stop the O ring being extruded into the gap. If it is being used for high pressure you use back up rings.
16 August 2017 at 21:01 #312398
Russell Eberhardt
Participant
@russelleberhardt48058
It's well worth getting a copy of Tubal Cain's Model Engineers Handbook. That gives the appropriate figures for various sizes of O-rings and the ideal profile of the groove for various applications. Lots more useful information as well.

Russell
17 August 2017 at 10:39 #312479
Phillip weaver
Participant
@phillipweaver84697
Thanks All for your replies. I am making a model of VICTORIA Steam engine and its my first go A real ham HI HI its coming along nicely building from scratch no casts that way I will learn a lot more . And Russell I will get a copy of Model Engineers Handbook
17 August 2017 at 11:12 #312484
JasonB
Moderator
@jasonb
In that case the sizes I gave will do just fine as I took them out of said book.
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