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Workflow for Tolerancing/Different Manufacturing Processes
jordan_mcbain
Member Posts: 2 ✭
Hi,
I created my design with no tolerancing at all and now I need to add it in for 3d printing. Doing this, however, will skew my tolerancing drawings for machining. Not sure these extra tolerances are good for assembly work either.
In the past, I have used a variable #PlasticIntent with a check to add a tolerancing "0.5in + ((#PlasticIntent>=1)?(0.005in):(0in)). The problem with this approach is that features like added holes for threaded inserts turn into modeling errors when plastic intent is turned off. This blows away an important q-check.
I've done some googling and it seems there is a lot of Onshape marketing material on "different workflows for manufacture" but I am not sure any of the content will actually be helpful. I am forming a hypothesis that Onshape's version control might be a solution but I picture the 3d print tolerancing disappearing on an update. I wish there were a better cherry-picking feature in Onshape versioning.
Anyone have helpful suggestions?
Comments
Configurations sounds like what you are after. You could have one for 3d print, one for CNC.
Suggest using move-face features for your tolerancing. Then you can change the value with a configuration. Or, have one move face for CNC, and a second for 3d print. Then control their supression with the configuraion.
As a check, do you really need two versions? 3D printers are quite good these days. Holes still tend to come in a hair undersized, but the rest of the model is usually pretty good. Holes are usually for screw clearance, so even if undersize, they might still work.