Drastic results on profiles and positions

[[ch...]]

I have ran this program a handful of times and this is the first time I'm getting weird results on my report. has anyone seen this and can help out with any info on this or if im doing something wrong.

[[Ma...]]

Seems like your GDT datum setup is wrong.

Origin in XZ and primary axis is taken from cylinder1
Direction and Y origin will take plane
Circle 1 is not used i think.

What result would you have if you switch circle1 with plane?

[[ch...]]

Okay i can try switching rotation to a plane and see how that does, everything else seems fine to you? Thank you for your feedback on this.

[[Ma...]]

One thing to note.

As someone stated, don't use base alignment as your datums ref.
It may not follow rule of creation of datum ref for ISO.

 

[[To...]]

I might be off course but I don't have Calypso in front of me.  In the old software, you used the special button to rotate the coordinate system.  I believe on the new system, you use the little icon in the lower right.  You'll probably need to rotate about the X axis by 90° or -90°.  Validate by verifying the nominal position values.  

Edited 4 hours ago

[[ch...]]

Please sign in to view this username.

 this is how i currently do it and im on calypso 25 with the new engines, next part i am going to try what you recommended and force the rotation by a plane and not a circle and see what results it will produce 

[[DW...]]

Please sign in to view this quote.

Please sign in to view this username.

Using a circle as a way to control rotation is... ill advised. 

[[ch...]]

Please sign in to view this username.

 okay I have changed this now to a easy accessible plane for rotation and I can see how this one reacts, appreciate your feedback on this

[[ch...]]

Please sign in to view this username.

 

Please sign in to view this username.

 this is now my rotation highlighted in red marking

[[ch...]]

Please sign in to view this username.

 

Please sign in to view this username.

 Using a plane as a rotational worked great, weird how it was running good in the beginning, Thanks for your help everyone

[[DW...]]

Please sign in to view this quote.

Please sign in to view this username.

 As a general rule your base alignment is to establish where exactly your part is for machine navigation. Simple 2d elements are your friend. Planes, lines, circles (not for rotation). So for example, judging by the trihedron in your picture, your part as I am standing in front of the CMM facing the bridge is laying perpendicular to the the granite. Use a four point plane on the largest plane facing you as Spatial (-Y axis) and your Y origin. Use the right inside plane (four point plane assuming it is a machined surface perpendicular to the large face in -Y) to control rotation in the +X space axis. Then, create a four point circle on the large inside diameter (single circle path, no cylinder, as your X and Z origins). 

Think about the six degrees of freedom... the best, most stable way to control all six degrees of freedom would be three mutually perpendicular planes. Obviously not all parts are cubes, so we rely on other standard geometries to restrict these degrees of freedom both physically, and within the software for calculating measurements. Using your picture in this example, imagine you tell the program that Circle 10 (a single point) controls the rotation in the +X axis... its going to do exactly that and give you all types of wrong information, and probably crash something to boot. 

Study up on alignment theory, and then turn it into practice on the machine to really grasp how important physical and virtual freedom restriction are for correct calculations.

Edited 2 hours ago

[[ch...]]

Please sign in to view this username.

 So I would use the base alignment to find the part and do I even worry about using start alignment or should I just select my datums for certain features as I go? this part for example my datums are easily accessible, only struggle I had was the rotation did not calculate. i have before made a program that i could not easily get to datums so i use other features of the part to get it aligned and as i program thru the part i then label what my datums are and select just those when choosing primary, secondary and tertiary for positions, profiles and what not. i appreciate this info as well thank you

[[DW...]]

Please sign in to view this quote.

Please sign in to view this username.

 Yes, the base alignment locates the part in the CMM measuring volume. At this stage in the game, do not worry about start alignments. Start alignments are when you have a more sophisticated base alignment. Your base alignment does NOT have to use any datums called out on the drawing. It may make sense, it may not depending on the size of the feature, location, etc. Your base alignment should be robust and repeatable. This is done by defining robust and repeatable features on your part and then correctly using them to restrain all six degrees of freedom (the exception being circular parts with no clocking features, for example a non spline shaft). The idea behind datums on a drawing is those are a theoretically exact point, axis or plane defined by the person who created the drawing as being important to the fit and function of the part. They can combine datums into a datum reference frame (for example A|B|C) to create a coordinate system for measurement (completely unrelated to your base alignment). 

 

There's lots of great information on these forums, in the Calypso help files (F1), and YouTube. Best of luck sir. 

Edited 2 hours ago

[[Ma...]]

Please sign in to view this quote.

That's what i can sign all day long 👍