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Angle alignment

shibantrip
Dear sir,
I have a part having datum A as plane, Datum B&Datum C as circle but the Datum B is with an angle to Datum A, it is not perpendicular to Datum A so when i going to call the position of some circles wrt ABC then a message show as secondary is neither parallel nor perpendicular to primary so tertiary is not allowed..

Thanks in advance.
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  • Dear sir,
    I have a part having datum A as plane, Datum B&Datum C as circle but the Datum B is with an angle to Datum A, it is not perpendicular to Datum A so when i going to call the position of some circles wrt ABC then a message show as secondary is neither parallel nor perpendicular to primary so tertiary is not allowed..

    Thanks in advance.

    Remember these two classifications of feature types: vector reducible and point reducible. Vector reducible features: Plane, Cylinder, Cone, Line /\/\/\ Point reducible features: Circle, Sphere, Point.

    Vector reducible features have directions associated with them, so they can be used to establish a rotation in an alignment (or FCF). Point reducible features don't have a direction, so you can't use only one, you must use two.

    When you measure a circle, it's a point reducible feature, and is also projected to the workplane. If you're measuring the circle on an angled hole, unless you're squaring up the hole in the alignment, you aren't measuring what you think you're measuring - you're measuring an ellipse. You need to measure the angled datum as a cylinder, this will give it the direction it needs to be used as a secondary datum.

Reply
  • Dear sir,
    I have a part having datum A as plane, Datum B&Datum C as circle but the Datum B is with an angle to Datum A, it is not perpendicular to Datum A so when i going to call the position of some circles wrt ABC then a message show as secondary is neither parallel nor perpendicular to primary so tertiary is not allowed..

    Thanks in advance.

    Remember these two classifications of feature types: vector reducible and point reducible. Vector reducible features: Plane, Cylinder, Cone, Line /\/\/\ Point reducible features: Circle, Sphere, Point.

    Vector reducible features have directions associated with them, so they can be used to establish a rotation in an alignment (or FCF). Point reducible features don't have a direction, so you can't use only one, you must use two.

    When you measure a circle, it's a point reducible feature, and is also projected to the workplane. If you're measuring the circle on an angled hole, unless you're squaring up the hole in the alignment, you aren't measuring what you think you're measuring - you're measuring an ellipse. You need to measure the angled datum as a cylinder, this will give it the direction it needs to be used as a secondary datum.

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