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Machine Shop and Tool Talk

What does T.I.R. mean?

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Old 10-14-2008, 08:42:06 PM
Rex Piekarczyk's Avatar
Rex Piekarczyk Rex Piekarczyk is offline
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Question What does T.I.R. mean?

In the machine shop world, what does T.I.R. mean?
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Old 10-14-2008, 09:15:44 PM
kevin johnson kevin johnson is offline
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Default Re: T.i.r.?

Total indicated runout.
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Old 10-14-2008, 10:53:03 PM
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Default Re: T.i.r.?

Its a term used when "dialing" in a part in a lathe or mill. If you need to have 2 diameters say within .001 run out, your dial indicator should read .001 or less run out of the 2 diameters to each other. Also known as concentricity. Blueprints will generally state how concentric all diameters of the part need to be to each other.
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Old 10-15-2008, 07:40:14 PM
Beanscoot Beanscoot is offline
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Default Re: T.I.R.?

Another way to look at it... if a shaft in a lathe chuck is a thousandth low on one side, and a thousandth high on the other, then the TIR is two thousandths, since that's the total.
So having a shaft chucked .001" off to one side will produce .002" TIR.
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