Using flange with scallops cut into it as datum

• Oct 9, 2020

• #2

Burunduk

Mechanical

May 2, 2019

2,358

What feature(s) locates this flange in assembly? Is it the clearance holes for the bolts or maybe the center bore?

 

Upvote 0 Downvote

• Oct 9, 2020

• #3

TheTick

Mechanical

Mar 5, 2003

10,194

While technically legal, you may want to put some thought into the feasibility of this. At least enough thought to get to the realization that it's not such a great idea.

 

Upvote 0 Downvote

• Oct 9, 2020

• Thread starter
• #4

jskevin

Mechanical

Jun 30, 2010

3

Yes its just the clearance holes for bolts which locates this part, and the OD doesn't mate with anything. So it would make a lot more sense to use the bolt pattern as datum B, right? Thanks for helping me think this through!

 

Upvote 0 Downvote

• Oct 9, 2020

• #5

drawoh

Mechanical

Oct 1, 2002

8,893

jskevin,

A complex shape like your scalloped flange, can be fixtured fairly easily if you call it up at MMC. We can make tooling.

Why do you want to do this? I think the hole pattern makes a better secondary datum feature.

--
JHG

 

Upvote 0 Downvote

• Oct 9, 2020

• #6

CheckerHater

Mechanical

Sep 22, 2009

2,879

How about Position of holes wrt [A] and Profile of the flange outline wrt [A]?

"For every expert there is an equal and opposite expert"
Arthur C. Clarke Profiles of the future

 

Upvote 0 Downvote

• Oct 9, 2020

• #7

Burunduk

Mechanical

May 2, 2019

2,358

jskevin said:

So it would make a lot more sense to use the bolt pattern as datum B, right?

Click to expand...

Right. And profile those scallops with reference to |A|B(M)|. This will probably reflect function the best way.

 

Upvote 0 Downvote

• Oct 14, 2020

• #8

Tmoose

Mechanical

Apr 12, 2003

5,626

What does the center hole do?

For that matter, what do the scallops do, and why is one missing>

 

Upvote 0 Downvote