centerline as Datum construction

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  • centerline as Datum construction

    How does one construct a centerline feature to use as a Datum? Centerline of cylinder is the Z axis. Can the z axis be specified as a Datum, or the origin point ?

  • #2
    Originally posted by Joe Arnold View Post
    How does one construct a centerline feature to use as a Datum? Centerline of cylinder is the Z axis. Can the z axis be specified as a Datum, or the origin point ?
    Level to the Cylinder.
    Set the Origin to it also (XY).

    No Problem
    Bill Jarrells
    A lie can travel half way around the world while the truth is putting on its shoes. - Mark Twain

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    • #3
      Originally posted by Joe Arnold View Post
      How does one construct a centerline feature to use as a Datum? Centerline of cylinder is the Z axis. Can the z axis be specified as a Datum, or the origin point ?
      The axis of a cylinder can be used for LEVELING an axis and origining the OTHER 2 axis. It can kind of be used to origin the same axis as it levels, BUT ONLY if a minimum of 3 surface samples are measured for it, I think a AUTOFEATURE cylinder can, in this case, be used. I do NOT think a learned cylinder can be.
      sigpic
      Originally posted by AndersI
      I've got one from September 2006 (bug ticket) which has finally been fixed in 2013.

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      • #4
        Maybe you would like to make an Axis a feature?
        Then use a generic line set to 0,0,0, with a vector of 0,0,1 and a length of 2 inches or so. This would make a line running straight up in the Z axis.




        http://images.wikia.com/memoryalpha/..._his_Women.jpg


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        • #5
          Depending on your part, it may be easier for you to measure a circle at the top and another at the bottom rather than a cylinder, (for example if your part has two different O.D.s but a common centerline). Sometimes it is not possible to create circles such that you can then make a proper cylinder from them b/c pc-demon "flips" the cylinder. However a 3D line between the two circles can be used to level to and set origin from, just the same as if it were a cylinder. HTH
          sigpic"Hated by Many, Loved by Few" _ A.B. - Stone brewery

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          • #6
            Originally posted by Wes Cisco View Post
            Depending on your part, it may be easier for you to measure a circle at the top and another at the bottom rather than a cylinder, (for example if your part has two different O.D.s but a common centerline). Sometimes it is not possible to create circles such that you can then make a proper cylinder from them b/c pc-demon "flips" the cylinder. However a 3D line between the two circles can be used to level to and set origin from, just the same as if it were a cylinder. HTH

            You can level to a point , or a line if you know what your doing.



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