Re: All ODs on the part needs to be concentric within 0.07 TIR - What does this imply
I have to agree with True Position when he/she states that they probably mean runout. Concentricity would apply to the centerlines and not the diameter surface. Measuring the TIR on the surface of the diameter compounds the error by accumulating both the concentricity variation and the roundness varition together into one TIR number.
Not to confuse matters anymore, but has any consideration been given to total runout versus regular (any element) runout?
The Impeller is mounted on a tapered shaft with a locking mut hold it in position. Then, the dial gauge was set, and the impeller rotated on its center axis.
No i have not considered the total runout.
I feel that, the note is not clear enough to say " the ODs need to be within a certain tolerance with reference to the OD."
If held by the shaft, and measure TIR of ODs "A", "B" and "C" what is the acceptable TIR as per the note?
Held by OD "A" and measure TIR of OD "B" and "C" what is the acceptable TIR as per the note?
held by OD "B" and measure TIR of OD "B" and "C" what is the acceptable TIR as per the note?
The problem is one of the OD is verymuch offcentric to the centerline, and I am not sure if I need to fix the drawing note.