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Aligning two axis
- Thread starter heypoopy
- Start date
Do you work to ASME Y14.5, and if so what release.
Fundamentally just showing to items aligned does not imply any relationship - you have to somehow tolerance this.
The best way to do this varies with situation.
For instance if the roller is long and the cam function related to its OD then it may make sense to make its OD the datum feature.
You could then relate both 'cams' to the roller OD.
Alternatively it may make sense to relate whatever mounts to the cam alignment holes.
Fundamentally just showing to items aligned does not imply any relationship - you have to somehow tolerance this.
The best way to do this varies with situation.
For instance if the roller is long and the cam function related to its OD then it may make sense to make its OD the datum feature.
You could then relate both 'cams' to the roller OD.
Alternatively it may make sense to relate whatever mounts to the cam alignment holes.
Posting guidelines faq731-376 (probably not aimed specifically at you)
What is Engineering anyway: faq1088-1484
What is Engineering anyway: faq1088-1484
CheckerHater
Mechanical
It's hard to suggest anything without picture.
If you want to design a shaft the cams will be attached to, look into ASME Y14.5-2009 Fig.4-40 and Fig. 4-41.
If you want to design a shaft the cams will be attached to, look into ASME Y14.5-2009 Fig.4-40 and Fig. 4-41.
If you were talking about two circular pieces on each end of a shaft, the easy answer would be a position tolerance ... and this would be the one rare case where no datum references are required (they each kinda become a datum for the other).
But because you are talking about lobed cams, the best GD&T option is profile. This would control the shape, size, orientation, and location (axial only) of the two cams. Just as profile can be used to align two coplanar flat surfaces, I'm thinking that a similar scheme can be constructed here. Just do an all-around profile tolerance (no datum references) on the cams and be sure to say 2 places or something.
However, I'm interested in others' comments on my suggestion.
John-Paul Belanger
Certified Sr. GD&T Professional
Geometric Learning Systems
But because you are talking about lobed cams, the best GD&T option is profile. This would control the shape, size, orientation, and location (axial only) of the two cams. Just as profile can be used to align two coplanar flat surfaces, I'm thinking that a similar scheme can be constructed here. Just do an all-around profile tolerance (no datum references) on the cams and be sure to say 2 places or something.
However, I'm interested in others' comments on my suggestion.
John-Paul Belanger
Certified Sr. GD&T Professional
Geometric Learning Systems
J-P, yup.
Jim Sykes, P.Eng, GDTP-S
Profile Services TecEase, Inc.
Jim Sykes, P.Eng, GDTP-S
Profile Services TecEase, Inc.
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