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Projection vs Intersection

TrueBlade87
Hello all,

Looking for some guidance, I have an assembly with a tapered hole reamed through all three parts/flanges, making one consistent/concentric cone, or so is the intent!
The theory is that each flange is made from a different material, and therefore cuts differently, to test this theory I am projecting/intersecting the cones from each flange to the upper surface.
When using intersection I notice the vectors all become perfect, and the resultant circle diameters are all within a micron.
Using projection the vectors are minusculely out, but the circle diameters are circa 0,1mm different, proving the theory that the softer material cuts bigger.
Problem is we have never measured this before, we don’t know if 0,1mm is a true reflection, and reading the help section I can’t figure out the difference in how projection/intersection works?
Any help would be much appreciated!
Thanks I’m advanced!
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  • Are these not the same thing?
    Continuing the the feature until it meets the desired plane?
  • in reply to TrueBlade87
    No.

    When you project a feature, if you only select 1 feature it will project along the vector of the active workplane. If you select 2 features, the first feature will be projected onto the second feature, projecting along the second feature's vector.

    When you perform an intersection, it looks at the data and, if needs be, moves it along the first feature's vector until it intersects the second feature.

    It's a subtle difference but imagine you had a cone sitting at Z= -50 who's axis was inclined at 45° about the Y axis. If your active workplane is ZPLUS and you construct a projected circle, all you do is move the centroid of the cone straight up until it meets the workplane (Z=0). The diameter will exactly match that of the original cone and the circle's orientation will match the workplane. The same would happen if you were to project your cone onto a ZPLUS plane sitting at Z=0. If you intersect the cone with a ZPLUS plane sitting at Z=0, you will get a circle sitting at the point where the original cone's axis passes through the plane. The circle will have the same orientation as the original cone and the diameter will have been extrapolated.
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  • in reply to TrueBlade87
    No.

    When you project a feature, if you only select 1 feature it will project along the vector of the active workplane. If you select 2 features, the first feature will be projected onto the second feature, projecting along the second feature's vector.

    When you perform an intersection, it looks at the data and, if needs be, moves it along the first feature's vector until it intersects the second feature.

    It's a subtle difference but imagine you had a cone sitting at Z= -50 who's axis was inclined at 45° about the Y axis. If your active workplane is ZPLUS and you construct a projected circle, all you do is move the centroid of the cone straight up until it meets the workplane (Z=0). The diameter will exactly match that of the original cone and the circle's orientation will match the workplane. The same would happen if you were to project your cone onto a ZPLUS plane sitting at Z=0. If you intersect the cone with a ZPLUS plane sitting at Z=0, you will get a circle sitting at the point where the original cone's axis passes through the plane. The circle will have the same orientation as the original cone and the diameter will have been extrapolated.
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