×
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

cross drilled hole in tube

cross drilled hole in tube

cross drilled hole in tube

(OP)
If the current ANSI 14.5 drawing standard is applied, would a cross drilled hole that extends entirely though a hollow bar (tube) be interpreted correctly with simply a hole size speified or should the hole be specified as 2X? Does ANSI 14.5 clearly state that a break in a cross drilled hole (resulting from the tube ID) imply one location?

thanks

RE: cross drilled hole in tube

On the contrary, if size dimension is the only characteristic specified for interrupted features (regardless whether with or without prefix "2X"), mutual locational relationship between the features is not controlled at all - features (in your case two holes) are considered totally independent of each other. So additional specification is needed to tie them together.

This can be done in a couple of ways:
1. Using Continuous Feature modifier <CF> following hole size dimension or a note "CONTINUOUS FEATURE". See fig. 2-8 of ASME Y14.5-2009. This is new concept in Y14.5. It makes the two holes a single entity. Rule #1 defines maximum material condition envelope that surfaces of both holes cannot violate. With this approach prefix "2X" shall not be specified.

2. Applying positional tolerance with no datum reference inside FCF associated with hole size dimension (this time with prefix "2X"). This would control offset of holes axes. See fig. 7-59 of Y14.5-2009. The positional tolerance may be applied with or without M modifier - all depends on function of the holes. If you specify "0 at MMC" positional tolerance, it would be equal to Continuous Feature modifier application described in point #1.

3. Assigning one of the holes as datum feature A and control the second with positional tolerance to it.

RE: cross drilled hole in tube

Per ASME Y14.5 the extension lines themselves do not indicate a continuous feature (see para. 2.7.5 in '09 edition), so still no relatioship would be defined.

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