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Recent content by bpcash

  1. bpcash

    Document Tight Tolerances

    I guess what I interests me most is what other people are doing to document their design decisions internally, rather than how to interact with our suppliers. If we are designing parts that can't be made, that is a separate issue, IMO. One idea that has been put forth is to require a written...
  2. bpcash

    Document Tight Tolerances

    At our company, whenever a we have a problem with a supplier meeting our tolerance, there is grumbling from management, purchasing, etc., the gist of which is "@%$# engineers can't design something that anyone can actually build". While I'm sure there are cases where this is true, there are...
  3. bpcash

    Medical Grade Resins - Worth the Money?

    My company manufactures surgical instruments for use in a broad array of specialties. We have some plastic disposable components, and recently one of the quality/regulatory guys decided we should be switching to medical-grade on all our resins (right now, mostly PC, Ultem 2100, and Vectra A130)...
  4. bpcash

    Rotary Vane Air Motors: Vane Shape?

    Another vane design I have come across has chamfered ends on the bottom instead of a curved profile. I would think this sort of feature would serve some function.
  5. bpcash

    Rotary Vane Air Motors: Vane Shape?

    Thanks. That could be what's confusing me. Our slots are square; I believe we are having them machined by EDM.
  6. bpcash

    Rotary Vane Air Motors: Vane Shape?

    Can anyone tell me why the vanes in rotary vane-type air motors are curved on the bottom? I've been tasked with re-evaluating the design of some of our motors.
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