GD&T help needed. Box with line through it in relation to True Position
Close
Login to Your Account
Results 1 to 9 of 9
  1. #1
    Join Date
    Feb 2013
    Location
    Madison, WI
    Posts
    1,272
    Post Thanks / Like
    Likes (Given)
    1320
    Likes (Received)
    816

    Default GD&T help needed. Box with line through it in relation to True Position

    Can someone tell me what the meaning of the rectangle box with the line through it is?

    This is off of a print from 1976 and is noted Geometric Symbols Per USASI Y14.5. I'm not finding anything on the Google, and I talked to the customer and they have no idea. There is also no rev change on that feature.

    Thanks!weird-gd-t-symbol.jpg

  2. #2
    Join Date
    Feb 2014
    Location
    FL
    Posts
    4,397
    Post Thanks / Like
    Likes (Given)
    13715
    Likes (Received)
    5269

    Default

    I'm forced to assume that that's a clerical error and they mean US ASME Y14.5, which was only implemented in 1973.

    I've never seen that symbol before, but it looks like a graphic for "Not Applicable" to me. What's Datum V? Is it possible that it has no relation to the keyway, so that's an N/A for its tolerance?

  3. Likes sfriedberg, AARONT, digger doug liked this post
  4. #3
    Join Date
    Feb 2014
    Location
    FL
    Posts
    4,397
    Post Thanks / Like
    Likes (Given)
    13715
    Likes (Received)
    5269

    Default

    I take that back, the original standard was ANSI Y14.5, which was superseded by ASME Y14.5. So yeah, that's definitely a typographical error. I'm digging to see if I can find a better answer for you.

  5. Likes AARONT liked this post
  6. #4
    Join Date
    Feb 2013
    Location
    Madison, WI
    Posts
    1,272
    Post Thanks / Like
    Likes (Given)
    1320
    Likes (Received)
    816

    Default

    Quote Originally Posted by TeachMePlease View Post
    I'm forced to assume that that's a clerical error and they mean US ASME Y14.5, which was only implemented in 1973.

    I've never seen that symbol before, but it looks like a graphic for "Not Applicable" to me. What's Datum V? Is it possible that it has no relation to the keyway, so that's an N/A for its tolerance?
    I was thinking the same. Especially since it is where a value should be.

    We're going to put them in in the same op, so they should easily be within a couple thou of each other anyway. So I'm not too worried. Thanks for checking!

    Per Wiki-
    USASI Y14.5-1966
    Succeeded by ANSI Y14.5-1973
    Preceded by ASA Y14.5-1957

  7. #5
    Join Date
    Jan 2014
    Location
    Temecula, Ca
    Posts
    3,381
    Post Thanks / Like
    Likes (Given)
    1413
    Likes (Received)
    4405

    Default

    judging by how it's being applied, my guess is it's an obsolete symbol for symmetry

  8. #6
    Join Date
    Nov 2018
    Country
    UNITED STATES
    State/Province
    Michigan
    Posts
    755
    Post Thanks / Like
    Likes (Given)
    414
    Likes (Received)
    503

    Default

    Looks to me like it's N/A on account of controlling a thru hole and therefore position being irrelevant. Missed opportunity for parallelism though, unless that is called out elsewhere.

  9. #7
    Join Date
    Jan 2020
    Country
    UNITED STATES
    State/Province
    Connecticut
    Posts
    55
    Post Thanks / Like
    Likes (Given)
    68
    Likes (Received)
    17

    Default

    Quote Originally Posted by TeachMePlease View Post
    I take that back, the original standard was ANSI Y14.5, which was superseded by ASME Y14.5. So yeah, that's definitely a typographical error. I'm digging to see if I can find a better answer for you.
    I don't think it was an error, the drawing was made with symbols from USASI Y14.5 1966 "Dimensional Tolerancing for Engineering Drawings." You can find a copy of it on Amazon: https://www.amazon.com/Dimensioning-.../dp/B001RS3IFI

    It is also listed in the inside cover of ANSI Y14.5M-1973: img_4616.jpg

    Seeing as it was drawn by hand, is it the original revision? I do have to agree that it likely just means not applicable.

  10. Likes gregormarwick liked this post
  11. #8
    Join Date
    Feb 2013
    Location
    Madison, WI
    Posts
    1,272
    Post Thanks / Like
    Likes (Given)
    1320
    Likes (Received)
    816

    Default

    Thanks for the input guys.

    pb1- The only Rev changes have been to heat treat and material. So unless I hear otherwise, N/A it is.


  12. Likes pb1 liked this post
  13. #9
    Join Date
    Jul 2009
    Location
    hope,in
    Posts
    687
    Post Thanks / Like
    Likes (Given)
    33
    Likes (Received)
    52

    Default

    I think this, the Z is Perpendicular to the face, ie Z. V is the position to the top hole. I think it could be Like '0 MMC'. X is the size difference allowable between the two Keyways slots. More of a hunch though.


Tags for this Thread

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •