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reference length for perpendicularity

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ptweising

ptweising

Mechanical
Joined
Oct 2, 2003
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2
Location
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I am trying to determine the perpendicularity of a pin hole to a machined surface. The machined surface is my reference plane. What I need to know is how deep into the pin hole do I need to go to get an acurate perpendicularity measurment.
 
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A quick answer would be to use a projected hole tolerance. A rough estimate could be 2x's diameter. I'd have to check on these, but they're plausible.
 
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Thank you for your assistance in this situation. If you find any further information it would be greatly appreciated.
 
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