×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!
  • Students Click Here

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

Jobs

Hole tolerance to a certain depth

Hole tolerance to a certain depth

Hole tolerance to a certain depth

(OP)
Hey guys, I've got an interesting question here. I've got a 2.500-2.503" hole that needs to hold that tolerance through a depth of 6.625", after that the tolerance can loosen up to 2.50-2.53", at least, to a depth of 6.875". Is there a specific way to illustrate this on the drawing, or is this something that should just be supplemented with a note? I can't find anything in Y14.5 relating to this particular case. Thanks in advance!

RE: Hole tolerance to a certain depth

ASME Y14.5-2009
Reference 7.4.1 Projected Tolerance Zone, and Figs 7-21 and 7-22.

"Art without engineering is dreaming; Engineering without art is calculating."

Have you read FAQ731-376: Eng-Tips.com Forum Policies to make the best use of these Forums?

RE: Hole tolerance to a certain depth

I am not sure that Projected Tolerance Zone concept is a proper one in this case. It is typically used when one wants to control orientation of FOS's axis outside the feature but not inside. Infact in this case we do not have any position tolerance.

mechanate, unfortunately I am also not able to find anything in the standard that could help you. It might be silly, but maybe this hole should be considered as two separate holes with two different size dimensions? I am curious how this hole is going to be manufactured.

RE: Hole tolerance to a certain depth

I agree that this doesn't sound like a case for a projected tolerance zone.  You may have to just create a view where the different segments of the hole depth are labeled with A, B, C (and shown with basic dimensions), and then write the different size tolerances with a note tying each to "A" etc.

John-Paul Belanger
Certified Sr. GD&T Professional
Geometric Learning Systems

RE: Hole tolerance to a certain depth

If you don't want to use Projected Tolerance Zone, you can make a section view of the hole, dim the hole to 6.625 with tol, then add another dim indicating the remainder depth tol.

Chris
SolidWorks 09 SP4.1
ctopher's home
SolidWorks Legion

RE: Hole tolerance to a certain depth

When a standard doesn't spell out a method, you can still employ a special specification on a drawing.  You just have to express it completely within the context of the drawing in the form of notes or dims where the meaning is very clear.

Matt Lorono
Lorono's SolidWorks Resources & SolidWorks Legion

&

RE: Hole tolerance to a certain depth

We do this kind of thing frequently.  Define a zone either with basic dims or in your case perhaps a 6.625 min.  Then specify the size tolerances in each zone.  

In your case, I don't see this buying you much manufacturing tolerance though.  The remainder of the hole is only .25" long and you are only allowing more tolerance in one direction.

RE: Hole tolerance to a certain depth

Depending which end you're coming from etc, maybe you could just dimension it as a counter bore since the mean dimension is different?

Or a section and spell it out.  You can apply different surface profile tol's to different portions of a profile per 6.5 ep figure 6-13.  So why not extrapolate similar to your situation.

I've done this for various situations.

Posting guidelines FAQ731-376: Eng-Tips.com Forum Policies http://eng-tips.com/market.cfm? (probably not aimed specifically at you)
What is Engineering anyway: FAQ1088-1484: In layman terms, what is "engineering"?

RE: Hole tolerance to a certain depth

Can you specify a limited length please look at asme y14.5 1.7.3  I know the illustration shows it on a shaft But I think it could work with a hole?

RE: Hole tolerance to a certain depth

(OP)
1.7.3 looks like it does the trick. I actually just ended up taking a section of the hole, drawing the first portion at its lower limit and the second portion at its upper limit so it would be clear what diameter and length I was dimensioning, then just adjusted the tolerances accordingly. The hole on the drawing ended up looking like a funky reverse countersink but it appears to have gotten the point across. Thanks for brining 1.7.3 to my attention though, I must have glossed right over that (it's kind of easy to get glossy eyed reading through Y14.5 anyway) and will most likely use that method in the future. Thanks again.

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members!


Resources