Keyway dimensioning
Keyway dimensioning
(OP)
Hi All,
I am designing a part that has two keyways 180 degrees apart on a single large diameter shaft. The intention of the keys/keyways is to allow axial motion of a female sleeve to which the keys are mounted while preventing rotational motion. It is desired that there is a minimum amount of rotational play.
What is the best way to tolerance the keyways and keys?
Thanks in advance.
I am designing a part that has two keyways 180 degrees apart on a single large diameter shaft. The intention of the keys/keyways is to allow axial motion of a female sleeve to which the keys are mounted while preventing rotational motion. It is desired that there is a minimum amount of rotational play.
What is the best way to tolerance the keyways and keys?
Thanks in advance.





RE: Keyway dimensioning
Certified Sr. GD&T Professional
RE: Keyway dimensioning
The most common method I've seen is a combination of size (width) and position. The width tolerance controls the size and form of the keyway, and the position tolerance controls the location and orientation of the centerplane (usually with the axis of the shaft OD as the datum feature). See Fig. 7-31 in Y14.5-2009 - the slots are not exactly like keyways but the tolerancing is similar.
Evan Janeshewski
Axymetrix Quality Engineering Inc.
www.axymetrix.ca
RE: Keyway dimensioning
Might I also recommend looking at figures 4-17 and 4-40 in Y14.5-2009 for other examples; however, I don't recommend "0" positional tolerance.
Certified Sr. GD&T Professional
RE: Keyway dimensioning
John-Paul Belanger
Certified Sr. GD&T Professional
Geometric Learning Systems