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  1. cjccmc

    sliding part design for dirty environment

    For sliding steel parts that need to have good resistance to jamming after being "dropped in the dirt" what magnitude of clearances are generally considered better, tighter (.001 -.003") or looser (.015-.020")? My application would be similar to a rifle design where only so much can be done to...
  2. cjccmc

    Protesting ASCE's Raise the Bar Initiative

    Well hang it all! I scrolled thru most of the posts and still cant find the answer. What do you call the dumbest, most useless person to graduate from medical school?
  3. cjccmc

    What Career I Should Choose

    A general rule I would suggest is to go into something that REQUIRES the college education you have. Otherwise you are competing with less educated people who are willing to work for less and may in fact do the job as well as you can. It wouldn't hurt to ask co-workers, HR or your senior...
  4. cjccmc

    Would you major in Civil Engineering in 2014?

    I was a Mech Engr essentially doing project management work for the first 6 years out of school. Got concerned that I was not developing "hard" engineering skills so left that to do design work. Now after 30 years and lots of solid design skills I have a layoff notice in hand and I'm surrounded...
  5. cjccmc

    Errors from using Lightweight PMI Section

    I haved a large assy file (NX8 and Teamcenter)and after about 3 weeks of work it developed an error that says something like "null pointer....". Or inhouse guru said it was probably because I have a Lightweight PMI Section view and those are known to generate errors. Do others here agree with...
  6. cjccmc

    Bond constraint

    For me problems happen with large assy files with lots of parts and constraints. Even when I check carefully to make sure it is not over constrained still bond does not work reliably. I can get it to work in simple demo files with just a few parts. I showed this to our on-site NX guru and he...
  7. cjccmc

    Bond constraint

    For me problems happen with large assy files with lots of parts and constraints. Even
  8. cjccmc

    Constraint sensitivity in NX8

    I don't see "positioning" under Assemblies menu. Is that where it would be located? Maybe it is not a "user" option in the version I have.
  9. cjccmc

    What raw stock for custom Jam Nuts

    Nice links TVP, thanks!
  10. cjccmc

    Constraint sensitivity in NX8

    Is there a setting for accuracy that can be dialed down a bit? How do you do it? I'm finding that slight imperfections in part models I have keep constraints from being applied in ways that work on perfect parts, so hoping this might help.
  11. cjccmc

    Re: ASME Y14.5M-1994 - positional tolerance with no datum/reference

    Kenat I hear you. I think that so far we have avoided any impacts because machining is accurate and fits loose enough to compensate for the fuzzy definition.
  12. cjccmc

    What raw stock for custom Jam Nuts

    I need to have custom jam nuts made as the mating parts have an extra fine J thd and these need to match and no common std parts of suitable quality exist. Need 50 each of these, .3125-32 UNJEF thd, .50 across flats, about .28 thick made of A286 STA. Program rules require parts list to call out...
  13. cjccmc

    Re: ASME Y14.5M-1994 - positional tolerance with no datum/reference

    On the project I'm currently working I repeatedly see an error kind on the flip side of this one. Holes etc. have full TP tol but datum planes are just drawn thru the part without identifying a datum feature. Many parts were done this way and delivered so not sure what the suppliers are...
  14. cjccmc

    Tolerances and part costs

    thanks for the replies DGallup: I agree that tol should not be any tighter than what is reqd. However, I often find that I can take multiple approaches depending on how tight I can get a feature on the part, and if tighter is not really that much more costly why not ask for it. For an everyday...
  15. cjccmc

    Bond constraint

    Hi John, I'm using NX 8
  16. cjccmc

    Bond constraint

    I used this one recently but it did not behave as expected. I "bonded" a nut and washer to a bolt which was constrained to a hole in another component. When I changed arrangements the bolt moved with the part to which it was constrained but the nut and washer stayed in original position. The...
  17. cjccmc

    Tolerances and part costs

    We always throw around the well worn phrase that tighter tolerances increase costs. I can understand that in many respects but what about the cost of inspection fixtures, like shown in the link, that have to be an order of magnitude more accurate than the part itself? On a low quantity purchase...
  18. cjccmc

    Revision description on drawings.

    I was always peeved by the fastidious checkers who wanted to see every little nit described in detail. Reason being that I can produce a whole new part and not explain why I did any of it but change something and the world needs to be able to fathom it all in unmistakable detail. My favorite...
  19. cjccmc

    Determining tolerance limits

    In my experience: 1) Use whatever was on the last drawing someone else did - seems very popular; see title block tolerances. Then use a fancy term like "heritage design" to justify and all heads will nod in agreement ;-)
  20. cjccmc

    Good Practice while stating tolerance on drawings!

    Asking that question on this forum = asking Allstate agent if you should have insurance [bigears]

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