×
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

dimensioning cylindrical taper

dimensioning cylindrical taper

dimensioning cylindrical taper

(OP)
One of a few "standard" ways of accurately dimensioning a cylindrical taper is to call out a slope based on DIAMETRAL change : axial distance.  And, for safety to use a symbol that looked like an arrowhead.

Is there a GDT symbol for that?

About the best I can do so far is apply an angular dimension to the included angle on the drawing.

Thanks,

Dan T

RE: dimensioning cylindrical taper

Heckler (Mechanical)
Tmoose

The symbol that looks like an arrowhead is Circular runout which controls coaxiality and circularity.  If your taper needs to be controled even tighter you might want to consider Total Runout.  Total runout controls variations of circularity, straightness, coaxiality, angularity, taper and profile.

But be warned this increases the cost of the part because now the entire surface must lie within the specified tolerance zone.

Best Regards,

Heckler

"Never underestimate the power of very stupid people in large groups" John Kenneth Galbraith

RE: dimensioning cylindrical taper

(OP)

"The symbol that looks like an arrowhead is Circular runout"

I guess I did not describe the tapersymbol very well.
It's related to the slope symbol.
It's on page 3, Fig 11 here -  
http://www.draftingzone.com/shoppingzone/6-1.pdf

It was real embarassing when a part machinedwith a 1:10 cylindrical taper (delta diameter) met a part machined to a 1:10 slope (2D delta radius) in the assembly room.

RE: dimensioning cylindrical taper

If you look under the Modifing Symbols there is a slope symbol there.

There is Up, Down, Inverted Up and a Inverted Down slope symbols there. You can get to this using an Annotation.

But from you first post you mention GD&T. Well if you don't see it in the list, then it's not available and probably isn't a true standard for the standard you are using there.

Regards,

Scott Baugh, CSWP
3DVision Technologies

http://www.scottjbaugh.com
Merry Christmas

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.


Resources