Clearance Recommendation

[agen14]

Hello,

I am designing a hinge system where a round tube (green) will rotate around a solid rod (red). The tube length is about 8"(200mm). My question is, what hole/shaft clearance basis would be best to use?

The tube will be tapped/threaded for a grease zerk. The max rotation is 90 degrees, and the speed will be 5 RPM max. The pin needs to be able to be assembled by hand. I attached a section view below. I know the wall of the green tube looks thin... I'm working on that as well.

 

[dvd]

My thought process on how to approach this would be to decide on pin diameter, considering, among other things pressure and velocity of pin surface on bearing material. The attached information from Bunting Bearing may be of use.

A different approach would be to calculate contact stresses.

 

[TugboatEng]

I typically go to ISO 286 for specifying fits.

If you prefer a cruder approach, 0.001" of clearance 1.000" of shaft diameter will get you in the ball park.

 

[agen14]

Thank you! I'll check this out