Profile of Surface

[[Me...]]

i initially have two Questions about the profile function.
1. i have a profile of .002 that only references one datum. In calypso when i try to put in ONLY the datum it wants it measured too, it gives me an error. how do i solve this?
2. the feature is a aligning the halves of a slot, [ ] is there a way to combine 3 sides into one profile Characteristic?

[[Cl...]]

1] Try creating a secondary alignment, and use that instead of pulling in a single datum.

2] Do you have Free Form Surface? If you do, you can use CAD - Creating Features - Point Set. Then create the FFS from faces.

[[Me...]]

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alright, turns out i don't have the free form option. its grayed out. to create a secondary alignment do i just create a new base alignment? and use the standard method? it doesn't seem like start alignment is right choice.

[[Me...]]

i think i found what i need in the help menu, but when i go to change base alignment and click special i don't get load secondary alignment option.

[[Ja...]]

David,

I think Clarke is recommending that you create a new alignment, and then in the profile evaluation, select the alignment instead of the datum.

To create a new alignment, go to [Resources] -> [Utilities] -> [Alignment]. Then, in your profile evaluation, above the datum selection there should be a drop down menu that you can navigate and select your newly created alignment.

[[Me...]]

alright, that looks better, so now i only want one datum. Do i select the face on the cad and then just click ok? is it that simple?

[[Ja...]]

The datum feature will already be measured, correct? If so, align your coordinate system (in the newly created alignment) to the datum (using the origin) in whichever directions the deviation is to be measured in. Complete the alignment as you did with your base alignment. Then, in the profile window, you can just select the alignment and be done. You will not have to explicitly select a datum at that point, as it'll be treating the alignment components (your datum) as the datum.

Does that help?

[[Cl...]]

If for example the "one" datum is a plane (XY) then spatial rotate and origin
(Z) the plane in the alignment window. Sorry David if I'm a little vague.

Sometimes I assume everyone is up to speed with Calypso, so I tend to leave
out minor details. If this is a multi surface feature that needs evaluated for
Surface profile, I don't have any other suggestion that will work without FFS.

[[Me...]]

also Datum A is on the Bottom and B is on the Far left in Calypso i have Z pointing Straight up and X to the right and Y going forward the same way the part is positioned in the print.

[[Me...]]

Maybe im saying this wrong.. i call each letter a Datum. Datum A,B,C and soo on.. but im guessing thats wrong.. im hoping the picture helps with what im saying

[[Me...]]

Just to add: If the single primary datum doesn't constrain all 6 degrees of freedom, you'll probably want to do a best fit alignment and allow translation/rotation for the unconstrained DOF to use all allowable tolerance.

[[Ja...]]

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You are correct in saying that the letters are the Datums. If you can measure the feature and the Datum, as Clarke suggested make a new separate alignment aligning to the Datum in whichever axes are appropriate (and secure your other DOF as appropriate), and use that alignment in the profile evaluation window through the drop down.

[[Me...]]

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using best fit alignment worked thank you.

[[Me...]]

Glad it helped. 🙂