dimensioning cylindrical taper

[Tmoose]

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

 

[SBaugh]

If you can't find one in try this - faq559-1052 - Otherwise you could make a block and add that into your draiwngs.

Regards,

Scott Baugh, CSWP
3DVision Technologies

http://www.scottjbaugh.com

Merry Christmas
faq731-376
faq559-716 - SW Fora Users

 

[Heckler]

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

 

[Tmoose]

"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.

 

[SBaugh]

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
faq731-376
faq559-716 - SW Fora Users