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OD and ID vs OD and Wall Thickness - which is the best method of dimensioning?

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1

Hello All, 

I am designing a conical-shaped plastic bushing and am confused if specifying the OD and the wall thickness is better for controlling the manufacturing process, or OD and ID separately, with their tolerance ranges individually specified?

    • Hello All, 

      I am designing a conical-shaped plastic bushing and am confused if specifying the OD and the wall thickness is better for controlling the manufacturing process, or OD and ID separately, with their tolerance ranges individually specified?

      0
    • Xometry Engineer

      Hi! This sounds like it’s potentially a sleeve bushing/bearing. You should always dimension to its function. In this case, the OD is important because I’m sure it’s going into something. The ID is also important because there is likely a rod or shaft location. The hole for the rod and the outer diameter for the fit are independent, and need independent dimensions. Dimensioning the wall thickness may not convey the design intent to the manufacturer. Things that may be important other than the diameters are concentricity GD&T callouts.

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      Reply
OD and ID vs OD and Wall Thickness – which is the best method of dimensioning?
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