Sheetmetal Forms: Library won't accept custom form

fred_burtt

I'm having trouble adding a custom sheetmetal form feature. The feature is tagged, single part in the part studio, and is configured w/ configuration variable named thickness as required. The form is rejected when I attempt to load it into the Library:

Element "Formed CSink" in document "Dimple" failed validation: "The Part Studio must be driven by a configuration parameter with ID "thickness" of type LENGTH, and that parameter must be valid in the interval [2.00000e-05m,1.00000m].".

Form model:

https://cad.onshape.com/documents/4e82ca124f8df04a00ee7862/w/9f65baa5539fb9d2861ca235/e/12adb08d5892345505dd21df?configuration=List_VHPhDl7VjheQGT%3D_5_dia%3Bthickness%3D0.0012700000000000003%2Bmeter&renderMode=0&leftPanel=false&uiState=67aa211c85f76f3234dc4cb2

Not sure what I'm missing.

ilya_baran

From a quick look, and the error msg, it appears that the bounds for the thickness parameter in your document need to be a lot wider, allowing a range between .02mm and 1m (it's ok if the model doesn't regen correctly for all of that range, just the config input needs to allow it).

GregBrown

Your Form tool will need some modifications… For the case of a flanged hole/dimple you need two parts: the "remove" part and the "add" part. Your "add" part looks fine. But the "remove" part is leaving a huge (6"x6") void in the model if you apply it… You need to think of it as the material that needs to be removed to make space for the "add" part to replace it. Also, there is no need to the "remove" part to be a sheetmetal model.

Something like the following will work for your case: the blue part is the "remove", the gray is the "add". I suggest naming your parts like this so it is harder to make an error in the Tag dialog.

PS: you should test your Form using a new Part Studio in the same document. Make a Sheetmetal part first, then create a Form feature, referencing the one you just defined. Additionally as a test, you can utilize just your "remove" part as a punch (i.e. delete the "add" from the Tag feature).

fred_burtt

@GregBrown Thanks for catching my conceptual error on the "remove" part. I made the change and the form is now usable in another part studio in that doc.

I tried changing the the min max values for the thickness parameter per @ilya_baran , but am still getting the same error message when attempting to add it to my form library.

eric_pesty

https://forum.onshape.com/discussion/comment/113750#Comment_113750

I'm guessing you haven't created a version…
Anything "outside" of the current document can only access versions of a document.

fred_burtt

@eric_pesty , Thanks that did the trick. Strange that the error dialog wouldn't flag that.