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Trouble dimensioning HW holes on a cylinder

Trouble dimensioning HW holes on a cylinder

Trouble dimensioning HW holes on a cylinder

(OP)
I am a green SW user converting from SurfCam and am having trouble dimensioning holes on a cylindrical surface. The part is an impeller with two 6-32 holes in each vane normal to the OD. I can put the holes in roughly where I want them, but I haven't been sucessful in locating them from the face of the part and the angular locations. When I try to dimension them, the dimensions go the the origin of the impeller and the hole point. I assume this is because the holes are a 3D sketch, but I don't know what to try next.

TIA for the help.

David Willingam

RE: Trouble dimensioning HW holes on a cylinder

Your point-location sketch is just a sketch like any other.  If you select a non-planar surface, the sketch will be a 3D sketch.

You can add reference geometry and dimensions to locate your sketch points.  Make sure any curves you draw are reference geometry.  In your case I guess you may want to add a centerline concentric to the cylinder to mark the axis.  Perhaps construction lines through the points and connected to the cylinder centerline, perpendicular to the centerline.

RE: Trouble dimensioning HW holes on a cylinder

(OP)
I got it. Thanks guys! I used construction lines to attach the hole points to the center of the impeller and dimensioned those and got the holes where I wanted them. I still don't think I am doing things the easiest way, but I am getting it done somehow. I really want to learn this stuff to help speed up design time vs Surfcam and to make changes faster. I bought two books from Amazon today on SW, so maybe they will help.

Thanks again,
David Willingham
Advanced Motorsports Engineering

RE: Trouble dimensioning HW holes on a cylinder

You can also constrain a point to a plane.

cheers

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