distance between two surfaces that are not parallel

[Mranaskw]

hello

i have recieved a part yesterday that might seemed an easy task , but the reliabilty was challenging for me , the requester wants to confirm an addition of 0.3 raw matterial on a surface , and also provided screenshot from the cadia showing the nominal distance between the top of the squaure surface (2mm length) and it ground surface , i did two things , first i measured the plane around that square then another plane on top of it and clicked measure distance , but since the planes are tilted to each other , i measured a point on top of it then created a projection point from both the plane and the top point then selected measure distance between that constructed point and the original points , ended getting close results and even lower value than nominal , what did i do wrong and what is the reliable way to compare to offset surfaces

[louisd]

This is quite a big question. Without more info, it would be hard to provide guidance.

If you have a CAD model, align to the part, measure the surface that is non-parallel, then output the T value of said feature. this will provide the deviation from CAD nominal, parallel to the vector of the plane.
If you do not have a cad model, you could construct generic points at the theoretical exact location of the non-parallel plane, per the drawing. With those theo exact points, construct a plane, and compare distances between the theo plane and the actual measured plane.

Of course alignment is critical here as well, definitely level to your base plane, rotate about something robust, then origin to base plane and some other x/y coords that you can functionally touch upon.

[Mranaskw]

This is quite a big question. Without more info, it would be hard to provide guidance.

If you have a CAD model, align to the part, measure the surface that is non-parallel, then output the T value of said feature. this will provide the deviation from CAD nominal, parallel to the vector of the plane.
If you do not have a cad model, you could construct generic points at the theoretical exact location of the non-parallel plane, per the drawing. With those theo exact points, construct a plane, and compare distances between the theo plane and the actual measured plane.

Of course alignment is critical here as well, definitely level to your base plane, rotate about something robust, then origin to base plane and some other x/y coords that you can functionally touch upon.

Actually i dont have the cad nor the drawing till now , can you tell me more about the generic points , becuase i still have came acorss it yet , and how can i create them at the theoretical exact location , lil help here plz im totally newbie

thank you so much

[louisd]

you need to have SOMETHING that tells you a "SHOULD BE". A drawing, A CAD file, or a sample part that is cut to desired parameters... to define a theoretical coordinate location or point. Once you have a known coordinate (say the xyz location for at least three edge points or corners of your plane), or a basic angle from the part origin plane, we could move forward with constructing a generic point. this method, however, depends on the information your provide.