×
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

Worst Case Tolerancing

Worst Case Tolerancing

Worst Case Tolerancing

(OP)
Hi,
Can any one, please, answer the following question in laymen terms:
- if I am doing a simple "worst case" tolerance analysis, how many pairs of the extreme dimensions do I consider?
example:
I have a pair of bayonet hooks (plastic part), which are 2.00 inches apart.(with +/-.01 tolerance.
The mating hooks are 2.01 inches apart (with +.02/-0 in.)
Which worst cases and how many pairs am I supposed to consider.
should they be as follows:
Max Bayonet-Min hook= x1
Min Bayonet-Max hook=x2
Min Bayone-Min hook=x3
Max Bayonet-Max hook=x4

Are these enough combination?
Please help!
thank you.

FM

RE: Worst Case Tolerancing

Max Hook (2.00 + .01)- Min match (2.01-.00)
Min Hook (2.00 - .01) - Max match (2.01 + .02)

Not accounting for location of the hooks, as you described, this is only the dimensional between the hooks.

RE: Worst Case Tolerancing

(OP)

monkeydog,
I appreciate your help.
From this point onward, I am assuming, I should pick such a range of tolerance that there will always be some clearance between the mating features.
Right?
Thank you.

FM44

RE: Worst Case Tolerancing

Right.

RE: Worst Case Tolerancing

Yes, if clearance is what you want.
ANSI Y14.5M is the governing document on tolerancing, but there are other books on the subject.

RE: Worst Case Tolerancing

(OP)

monkeydog/vims,
Thank you for your help. Even though the assembly is more complicated and I just presented it in simplest terms, just to understand the basics. I should be able to take it from here.
I appreciate your time and help.


Farid

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