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Need help reporting Taper/foot of a Cone

Jegley

Hey guys. I am inspecting a part with a tapered bore. The drawing calls out '1.5" PER FOOT TAPER' with a tolerance block tolerance of ±.010. I measured the feature as a cone and my options are to report as an angle or half angle. I know that the half angle should be 3.5763. And to translate that to taper per foot I worked out the following equation: taper/foot = 24*tan(half angle). How can I implement this so that my report shows the measured taper/foot with a nominal of 1.500 ±.010? Currently I am reporting the half angle with a tolerance of ±.0238 which is what I calculated as .010"/foot taper as a half angle. Appreciate the help. 

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  • +1

    How about you construct a circle 12" from the cone apex and report the diameter?

  • 0 in reply to Mike Philips

    All due respect, I'm not trying to be a critic, I appreciate all the help. And I'm new to this so I don't know how to do everything.

    When I think thru the steps to do it this way, I would have to have some way of finding the cone apex on every part. I could make a point at the theoretical apex if the cone was exactly to print, but if its not the exact right taper angle or the start and end diameters are not at nominal the cone will have a different apex and a different location for the constructed circle. I don't know how I could make the apex point and constructed circle move depending on the measured angle and location of the cone. But if there is a way to do that then I think this method would be superior to the key-in dimension way I'm using now.

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  • 0 in reply to Mike Philips

    All due respect, I'm not trying to be a critic, I appreciate all the help. And I'm new to this so I don't know how to do everything.

    When I think thru the steps to do it this way, I would have to have some way of finding the cone apex on every part. I could make a point at the theoretical apex if the cone was exactly to print, but if its not the exact right taper angle or the start and end diameters are not at nominal the cone will have a different apex and a different location for the constructed circle. I don't know how I could make the apex point and constructed circle move depending on the measured angle and location of the cone. But if there is a way to do that then I think this method would be superior to the key-in dimension way I'm using now.

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