×
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Contact US

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!

*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

Applying the appropriate tolerance..

Applying the appropriate tolerance..

Applying the appropriate tolerance..

(OP)
On a few of our prints, from time to time, I note that our Drafting group has used dimensional callouts with single-digit characteristics, such as "2.0" for example.

In our typical "standard" Tolerance chartings, there is no tolerance criteria for a dimesional callout for this type of number.

We obviously would use ±.01 for a ".00" number, and ±.005 for a ".000" number.

What tolerance would YOU apply to a ".0" number?

-Soupy1957

Telepathy only enhances the world I live in!!

RE: Applying the appropriate tolerance..

I wouldn't.  I would ask for clarification from the originator.

RE: Applying the appropriate tolerance..

I agree with ewh, without a reference or standard available, your best recourse is to go back to the individual who designed it.

Regards,

RE: Applying the appropriate tolerance..

We used to have this issue occcasionally until we finally added a tolerance for a "one digit to the right of the decimal place" dimension to our drawing template.  

For our purposes our tolerance chart now looks like this:

3 PLACE (.xxx) DEC = +/- .010
2 PLACE (.xx) DEC = +/- .03
1 PLACE (.x) DEC = +/- .1

These are the typical tolerances that work in our industry (aircraft after market modification), and of course a drawing note can always override these standard tolerances for any given dimension.

debodine

RE: Applying the appropriate tolerance..

Oops, hit submit not edit.

As you may see from my reply to your other post, I'd tend to agree with ewh & PSE.

I'm not sure why you say "We obviously would use ±.01 for a ".00" number, and ±.005 for a ".000" number.".  Why is this obvious?  Is this what you standard tol block says?  

I've seen lots of tol blocks saying something different, I've also seen separate tolerance standards referenced, also tolerances based on size of feature, a single value regardless of decimals and no tolerance block with every dimension directly tolerance by +- or limits.

The tolerances for each dimension should be based on function, with manufacturability an important secondary concern.  They should not arbitrarily be asigned based on decimal places without the function being considered.

There's a different between determining values for, and specifying tolerances.

I'd go back to your drafting department and ask them, based on function, what the tolerance should be.

KENAT, probably the least qualified checker you'll ever meet...

RE: Applying the appropriate tolerance..

IF IT IS AN INTERNAL DWG, GET WITH DRAFTING. I WORK IN THE AERO SPACE INDUSTERY, ONE OF OUR CLIENTS HAS THIS IN THEIR TOLERANCE BLOCK

.XX +-.03
.XXX +-.02
.XXXX +-.03

I DID A DOUBLE TAKE AND A HEAD SCRATCH, THEN CONFIRMED THE BLOCK WITH MY BOSS. ITS THE WAY THEY WANT IT.

MIKE

RE: Applying the appropriate tolerance..

Yarak, now that's weird.

KENAT, probably the least qualified checker you'll ever meet...

RE: Applying the appropriate tolerance..

YARAK,
Try and get with your customer, or get with your sales person to get with your customer.
It is fat finger mistake.
Your customer would appreciate the clarification, rather then have you make it to print, then have to scrap and remake it.  
If not for the cost, then for the schedule hit.

RE: Applying the appropriate tolerance..

monkeydog, I took "ITS THE WAY THEY WANT IT" to mean his boss had talked to the customer and it's the way they want it.

KENAT, probably the least qualified checker you'll ever meet...

RE: Applying the appropriate tolerance..

THE CLIENT CAME DOWN, BEFORE I STARTED HERE, AND HAD A MEETING WITH QC TO VERIFY THE BLOCK.

ITS A BIG CLIENT THAT IS GOING TO BE LATE WITH THE NEW AIRPLANE THEY ARE BUILDING.

IS THAT HINT ENOUGH?:)

RE: Applying the appropriate tolerance..

YARAK, NO NEED TO SHOUTwinky smile

Hmm, gee let me see.  Late with the new airplane they are building, as opposed to late with the one they've just built.

No I can't work it outwinky smile

KENAT, probably the least qualified checker you'll ever meet...

RE: Applying the appropriate tolerance..

The usual tolerances I see are:

X. +/-.015
XX. +/-.010
XXX. +/-.005
XXXX.  +/-.0005

This is of course not metric.

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! Already a Member? Login


Resources

Low-Volume Rapid Injection Molding With 3D Printed Molds
Learn methods and guidelines for using stereolithography (SLA) 3D printed molds in the injection molding process to lower costs and lead time. Discover how this hybrid manufacturing process enables on-demand mold fabrication to quickly produce small batches of thermoplastic parts. Download Now
Design for Additive Manufacturing (DfAM)
Examine how the principles of DfAM upend many of the long-standing rules around manufacturability - allowing engineers and designers to place a part’s function at the center of their design considerations. Download Now
Taking Control of Engineering Documents
This ebook covers tips for creating and managing workflows, security best practices and protection of intellectual property, Cloud vs. on-premise software solutions, CAD file management, compliance, and more. Download Now

Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close