Tek-Tips is the largest IT community on the Internet today!

Members share and learn making Tek-Tips Forums the best source of peer-reviewed technical information on the Internet!

  • Congratulations LittleInch on being selected by the Eng-Tips community for having the most helpful posts in the forums last week. Way to Go!

One way perpendicularity GD&T 1

Status
Not open for further replies.

Raddy13

Mechanical
Joined
Jun 6, 2012
Messages
49
Location
US
I'm trying to set up the tolerance for this O-ring groove, and the O-ring catalog says the side wall can be 0 to 5 degrees outwards; i.e., the top of the groove can be wider than the bottom, but never narrower. Is there a way to represent this with a perpendicularity tolerance? I'm thinking not because the tolerance zone would allow for 0 to -5 degrees taper, but I'm very green with GD&T, so I thought I would double check.
 
 http://gyazo.com/9debe12ab6c2e3adff6183008546d2a6
Checkerhater

All the process engineers and machinists in our shop and any job shop we have ever used will just machine it square. Never saw anyone use one of those inserts you linked too. However, all our o-rings are smaller than the minimum those tools can do so maybe there is an advantage to the angled sides for machining bigger grooves. The only place I've actually had angled o-ring grooves is on molded parts but deflashing the parting line is a PITA.

----------------------------------------

The Help for this program was created in Windows Help format, which depends on a feature that isn't included in this version of Windows.
 
This seems like much ado about nothing... just following the recommended Parker scheme solves those GD&T problems. But of course, there are those that feel a part should be able to be completely defined using GD&T.
Perpendicularity is not the way to go.

“Know the rules well, so you can break them effectively.”
-Dalai Lama XIV
 
Status
Not open for further replies.

Part and Inventory Search

Sponsor

Back
Top