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Perpendicular Help

xbigfatgoat
Hello Everyone,

I'm having issues getting good results with the perpendicularity on this part that I'm checking. The drawing is posted.

Reading here on the forum I see that small cylinders could cause issues with perpendicularity. The parallel and concentricity come out great.

I've tried leveling to the datum B plane and the Datum A cylinder without any success.

Basically, if I report the perpendicularity of the cylinder with respect to Datum B I get extremely small numbers such as .00001.

If I report the perpendicularity of the plane with respect to the Datum A cylinder I'm getting measurements ranging from .003-.005.

The range comes from checking different parts but the measurements are consistent for each individual part.

I'm measuring cylinder A with two constructed circles using a 3mm dia stylus. Im using PCDMIS 2022.1.

Any help would be much appreciated. Thanks.

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  • I hate seeing this on a print. I know I'm gonna have to explain why the big variation every time. So imagine taking a gauge pin the size of your A datum and putting a ring gauge on that pin 0.25 down on to the pin, you will most likely be able to easily tilt that ring gauge from side to side. There is just not enough cylinder there to hold a ring gauge in place. Only the bottom surface would be keeping it from tilting, not the a datum cylinder. This is the same way a machine is going to react when measuring it. A 0.0001" out of roundness or size difference is going to affect it. If you feel you can't get through to engineering on the matter you could take a plane around the cylinder before measuring it. (kind of lying basically) It makes it more consistent.
  • in reply to markoor99
    something like a projection,
    the cylinder then has the same vector as your plane

    Construct Cylinder (Project Cylinder) first input a circle, second input a Plane
    (if you use only the circle then it will project the cylinder to the workplane.)
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