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Re: true position on a round part

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Posted By<" ">Rob B on August 09, 2002 at 18:25:44:

In Reply to: true position on a round part posted byFrank on July 24, 2002 at 15:33:41:

To qualify your bore you must determine the axis(i.e. the center) of the round part then find the axis of your bore. The .005" represents a round area with a diameter of .005, and its centerline coincident with that of the part. Then, the centerline of the bore you drilled must lie within this circular area. Runout is also a valid callout with similar results. BTW, there are 2 runout terms, circular and total runout, the latter of which is more controlling. For runout the .005" is total indicator reading, not plus/minus. Hoped this helped. I'm not an expert either so someone will probably have a better explanation.

: I'm not trained in this field.
: My question relates to the determining true position of a bore in the center of a round part. I have people telling me different things. If a part has a callout of .005 true postion of the bore, I'm thinking a simple way to measure is runout. But is the run out max at .005 or +/-.005 (.010 run out) This situation is more clear to me on a flat part with X and Y coordinates. The round part is confusing me.

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< "> Subject: Re: Re: true position on a round part

Comments: : To qualify your bore you must determine the axis(i.e. the center) of the round part then find the axis of your bore. The .005" represents a round area with a diameter of .005, and its centerline coincident with that of the part. Then, the centerline of the bore you drilled must lie within this circular area. Runout is also a valid callout with similar results. BTW, there are 2 runout terms, circular and total runout, the latter of which is more controlling. For runout the .005" is total indicator reading, not plus/minus. Hoped this helped. I'm not an expert either so someone will probably have a better explanation. : : I'm not trained in this field. : : My question relates to the determining true position of a bore in the center of a round part. I have people telling me different things. If a part has a callout of .005 true postion of the bore, I'm thinking a simple way to measure is runout. But is the run out max at .005 or +/-.005 (.010 run out) This situation is more clear to me on a flat part with X and Y coordinates. The round part is confusing me.

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