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find intersection of a generic circle and angled plane below the surface

joedraper
Hi all, I am new to PC-DMIS (2021R1 CAD++) and have been working on trying to configure a measurement for a couple weeks now. I do apologize for my terminology ahead of time. This forum has helped tremendously with the other measurements for this part, however, I have not been able to find a post related to this special characteristic that can apply to what I am looking to accomplish.

I am looking for some advice regarding a special characteristic that I need to find the intersection measurement between a generic circle/cylinder (R=34.5) and -0.49 below the part surface on an angled plane of 10+/-0.5 deg from the center of the measured circle (R= 30.25). The whole part is in 3D space, but the SC i am looking for is shown in 2D (ZX) as a side view. (hopefully the pic is visible). ​ ​
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Ive experimented with different settings/methods for constructing lines, points, planes and generic constructions of cylinders/circles to try and program the needed measurement efficiently and accurately. I may be missing a step when trying to align the generic circle (34.5R @ Z-PLUS) to the smaller measured circle (which R=30.25) located below the angled plane. Another issue i have encountered is trying to create a stationary line from the center of the constructed circle intersecting at the desired measurement location (generic circle and angled plane intersection), in tolerance (0.49 +0.08/-0.02).

Please let me know if additional clarification. I am very grateful for any help and direction from the community Slight smile . Thanks in advance!

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  • Create line on angled plane.
    Create pierce point by intersecting the line and the cylinder you have created with R34.5.
    Dimension the 0.49 to the pierce point.
    Profit.

    Don't use the 0.49 at all. That's the dimension you are looking for. The cylinder sets the rules @ [34.5]. The point where the angled line pierces the cylinder should be 0.49 ± tol from the plane.
  • in reply to vpt.se
    Use two auto vector points (having CAD is VERY helpful). Let's go by the orientation of the snippet you posted.

    Take the first vector point at the low end of the angled plane.
    Take a second vector point at the higher end of the angled plane.
    Create a 3D line between the first vector point to the second vector point (line direction is now left-to-right).
    *3D line because typing the creation of a 2D line is just too much to type...
    Create a pierce point using the line and your cylinder. This point should end up close to the high end of the plane.
    If it doesn't, construct a new line using the line you already created, but flip the direction of it (reverse).
    Then try to pierce the cylinder with the new line and see if it ends up at the high end.
    Dimension accordingly.
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  • in reply to vpt.se
    Use two auto vector points (having CAD is VERY helpful). Let's go by the orientation of the snippet you posted.

    Take the first vector point at the low end of the angled plane.
    Take a second vector point at the higher end of the angled plane.
    Create a 3D line between the first vector point to the second vector point (line direction is now left-to-right).
    *3D line because typing the creation of a 2D line is just too much to type...
    Create a pierce point using the line and your cylinder. This point should end up close to the high end of the plane.
    If it doesn't, construct a new line using the line you already created, but flip the direction of it (reverse).
    Then try to pierce the cylinder with the new line and see if it ends up at the high end.
    Dimension accordingly.
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