Runout to check positional location
Runout to check positional location
(OP)
Quick question as a sanity check...
I have a tube with the OD as Datum A and position of the ID controlled by .002" RFS. Let's assume for the sake of this question that the OD and ID are of perfect form. Our supplier is saying they use circular runout to verify the positional tolerance is met and claim that since the runout is less than half the positional tolerance, these parts should meet print. Is that a fair assessment?
Fortunately they are bringing a CCM online so they can actually verify conformance to the positional tolerance, so this matter of using runout when I specify position only needs to be tolerated long enough to get some sample parts.
I have a tube with the OD as Datum A and position of the ID controlled by .002" RFS. Let's assume for the sake of this question that the OD and ID are of perfect form. Our supplier is saying they use circular runout to verify the positional tolerance is met and claim that since the runout is less than half the positional tolerance, these parts should meet print. Is that a fair assessment?
Fortunately they are bringing a CCM online so they can actually verify conformance to the positional tolerance, so this matter of using runout when I specify position only needs to be tolerated long enough to get some sample parts.





RE: Runout to check positional location
RE: Runout to check positional location
John-Paul Belanger
Certified Sr. GD&T Professional
Geometric Learning Systems
RE: Runout to check positional location
A diametrical tolerance zone of .002 equates to a circular runout of .002.
Dave D.
www.qmsi.ca