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- Thread starter lly
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lly,
In my experience what this means is that the surface finish is called out to be 125rms with a +/- .005". There is a gauge to measure this which most of the machine shops do have. In short this means that they want a fairly smooth surface finish, I believe this is standard for many valve seats. Hope this helps.
In my experience what this means is that the surface finish is called out to be 125rms with a +/- .005". There is a gauge to measure this which most of the machine shops do have. In short this means that they want a fairly smooth surface finish, I believe this is standard for many valve seats. Hope this helps.
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125 probably means 125 µin RMS. (Microinches root mean square)
TIR is total indicated runout. It is measured by rotating the cylindrical member and measuring the runout using a dial indicator. It can be rotated either on precision centers or v-blocks. There are pluses and minuses to each approach.
TIR is total indicated runout. It is measured by rotating the cylindrical member and measuring the runout using a dial indicator. It can be rotated either on precision centers or v-blocks. There are pluses and minuses to each approach.
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