We like to say that the CAD for parts is near-perfect, while the real world is far from perfect. There will almost always be discrepancies in CAD, but often the discrepancies are very minor – a millimeter here or there. Sometimes though, for a variety of reasons, the CAD will be way off, and may even be missing key components on the part.
With minor discrepancies, it’s actually quite simple – use a technology to compensate. For applications like welding, talk to your integrator about touch sensing, seam tracking, or a vision system. For applications like deburring, look at compliant tooling. These compensation technologies are critically important, and many of our customers use them with great success. We HIGHLY recommend the investment. But note, the technologies described are only useful for small discrepancies – for more on that, read our last OLRP Expert Series article here.
For large discrepancies, there are two potential solutions:
For situations where parametric components cannot be used, we advise that you just make sure the tool isn't in collision with the part and/or jig, and then touch-up. We know we know, touch-ups are frowned upon by many, but it's simply the best solution in a lot of cases; here are some reasons why: