Smart questions
Smart people
 Find A ForumFind An Expert
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS

Remember Me

Are you an
Engineering professional?
Join Eng-Tips now!
• Talk With Other Members
• Be Notified Of Responses
• Keyword Search
Favorite Forums
• Automated Signatures
• 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.

Just copy and paste the

#### Feedback

"...It is good to know that there are groups such as this willing to share knowledge in this money driven economy..."

#### Geography

Where in the world do Eng-Tips members come from?

# Parallelism question

 Forum Search FAQs Links Jobs Whitepapers MVPs
 lessfull (Aeronautics) 28 Dec 11 15:58
 Hi everyoneI have a tolerance that states "// 0.025/ 100 in to datum A"  in milimetersI'm interpreting that means parallelism within 0.025 mm over a 100 mm diameter area relative to datum A.Is it correct?Tanks
 Belanger (Automotive) 28 Dec 11 17:39
 Almost correct, except that I'm not sure about the "diameter" thing. To say that, there would be a diameter symbol Ø before the 100; without it we would just assume linear length of 100 (although that too can be confusing because I would usually show another dimension, such as 100 X 12). I also wonder what the "in" means after the 100 -- did you mean mm?  It would be strange to mix a millimeter tolerance with an inch dimension on the local segment. John-Paul BelangerCertified Sr. GD&T ProfessionalGeometric Learning Systems
 lessfull (Aeronautics) 29 Dec 11 14:06
 Well, i was trying to put in words what appears in the drawing, the "in", i meant it to relate the values to the datum A, the "in" doesn't appear in the drawing. Is only milimeters the tolerance.Trying another time: "   //0.025/ 100   "  it's what appears before the reference to datum A. The diameter was an interpretation i made but my initial tought about it was a linear section of 100 mm, but then only appears as i wrote above without anything after the "100".Tanks for you attention

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:

• Talk To Other Members
• Notification Of Responses To Questions
• Favorite Forums One Click Access
• Keyword Search Of All Posts, And More...

Register now while it's still free!