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I've been going back and forth on runout and position with LMC. I decided to try position. I've attached a sample drawing. assuming i dont want the wall thickness to fall below .0085, does this tolerance make sense? I don't want to submit this to a vendor and have them laugh in my face. Thanks...

Dingy2, What my inspectors would do is put a pin gauge into the hole, zero off the pin gage, and then runout the OD. Thats why I just wanted to make sure that the opposite works.

dingy2, you mention to hold the OD as a datum for a runout tolerance on the ID. Is it the same if i hold the ID as the datum and runout the OD?

Kenat, Sorry if I wasn't clear. The plastic part is molded with the hold in it. Its a pretty compliant part (soft plastic). The hole mates to a shaft. At its smallest, the hole is already .001 larger than the OD of the shaft. I'm not designing the part, just trying to fix the drawing so that...

Thanks for the help guys!

Hello All, I have a small cylindrical part that has a hole drilled into it. I am trying to decide if the OD and the ID (really the diameter of the hole) should be called out as a wall thickness or a concentricity tolerance. The part is molded out of plastic. I'm leaning towards wall thickness...

wow, you guys gave me a lot of cases. the part i'm concerned about is a piece of tubing. I am not sure how the raw stock is purchased so I dont know if the parts are cut from 6" pieces or not. I'm going to tell my mfg eng. that it should be toleranced with an upper limit such as: 3" -0.0/+.500"...

Hi everyone, this is my first post so go easy please. I've got a part that my mfg engineer wants to dimension as: 3" minimum. is that an acceptable callout? what is trying to be said is that there is no limit on how long it can be, as long as the part is 3" or longer. is this dealt with in asme...