Applying Cylindricity to threded Features
Applying Cylindricity to threded Features
(OP)
Hi All,
I saw a drawing where the cylindricity has been applied to the minor dia of an external thread. Is this is legal specification?
Does really cylindricity is required for the threaded feature in real applications? I have heard that cylindricity is a very stringent requirement and should be specified only if it is required.
My doubt is can we apply cylindricity to threded feature.
Can any one help me in this regard.
I saw a drawing where the cylindricity has been applied to the minor dia of an external thread. Is this is legal specification?
Does really cylindricity is required for the threaded feature in real applications? I have heard that cylindricity is a very stringent requirement and should be specified only if it is required.
My doubt is can we apply cylindricity to threded feature.
Can any one help me in this regard.





RE: Applying Cylindricity to threded Features
The thread specification controls cylindricity, or some equivalent to it. My assumption would be that for some reason, there is a requirement for cylindricity on the minor diameter that is tighter than what would be imposed by the screw thread specification.
If the cylindricity is looser than the thread specification, then the thread specification controls the feature, and cylindricity is redundant.
RE: Applying Cylindricity to threded Features
Powerhound, GDTP T-0419
Engineering Technician
Inventor 2010
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RE: Applying Cylindricity to threded Features
If it is straightness that is required, then straightness at MMC and place "MAJOR" below the feature control frame. Now it can be confirmed with a checking fixture quite simply.
Dave D.
www.qmsi.ca
RE: Applying Cylindricity to threded Features
Jim Sykes, P.Eng, GDTP-S
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