Quote:
Originally Posted by dw1
Perhaps I am not understanding the issue, but if you have the part geometries predefined, it doesn't really matter how near or how far the unmodified part is to the finished geometry. A CNC machine will cut it to the geometry that is predefined via the CAD/CAM program. The measurement probe, be it small point contact or laser scan, could provide verification of the finished item.
A similar methodology is used in the manufacture of orthopedic prostheses (e.g. knee and him implants) which are somewhat customized to patient-specific dimensions.
If I am misunderstanding the question, please let me know. I do have close to 40 years of experience in the design and manufacturing of prototype precision parts for aerospace and biomedical applications, much of this via CNC and CAD/CAM, and perhaps I can provide some other suggestions.
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I'm probably not being clear in how I define the original parts to be sanded. They are parts that are 50 years old. They were originally manufactured to be identical but were created and modified by hand, slightly, when new, to all fit together. And they have been in use for 50 years subject to all kinds of stresses which means that two of the same pieces can be pretty far off in terms of overall dimensions.
So any machine acting on them needs to know the exact shape and dimensions of that piece vs. another "identical" one next to it.
Does that make sense?