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  1. gdtdave

    How to persuade engineers to abandon silly tolerances?

    "Why is it so important that the cosmetic, non-functional front face of a console-mounted display is everywhere within 0.010" of the rear?" Good question. Is parallelism of .250 too much? .500? Flatness of .375? For certain, most suppliers hate having rejectable characteristics added to...
  2. gdtdave

    Y14.5-82 vs. Y14.5-94

    Agreed, the appendix is a good place to start, and to really use it one must go through it and pull from each version the sections that it discusses and see how the change came about. The difficulty to be overcome is that there is not always a one-to-one correspondence. However, difficulty is...
  3. gdtdave

    Value of helical split and toothed lockwashers

    Hmm, experts? The main problem with locking washers is that using them is no good guarantee that the fastener won't loosen. A look at www.boltscience.com will give quite a few good reasons for fasteners to come loose. It's that false sense of security that's a real problem. Is there a...
  4. gdtdave

    Tolerance Chains & Tolerance Stack-up

    There are several programs that can do a good job. VSA, currently from EDS. Valisys, which was developed at the same time as VSA, but is separate. Technomatix comes to mind as the supplier.) 3DCS from Dimensional Control Systems CE-TOL from Sigmetrix (via ADCATS) (Pro/Engineer only) The...
  5. gdtdave

    Trail Files

    Changing the filetype to .txa - training file extension and the file will stop with 'out of sequence' when it gets to an error point. There used to be a config option something like trail_oos which could be set to 'no' to prevent unexpected exit. It's gone for version 2001. In 2001 both training...
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