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  1. engiNERD77

    Corrosion Resistance

    I have a hex shaped fixture that is plugged into an adaptor. The fixture is made of 4140 ph. I originally had no coating and became concerned with rusting. The second design had a black oxide coating but is quickly wearing off. Could I get some ideas of the cost difference with maybe a...
  2. engiNERD77

    BLACK OXIDE ON 4140 PH

    Thanks guys! Pretty much what I had read about.
  3. engiNERD77

    BLACK OXIDE ON 4140 PH

    WILL THE A CALL OUT FOR BLACK OXIDE GIVE THE SURFACE RESISTANCE TO RUSTING?
  4. engiNERD77

    18NiCrMo5

    Can anyone tell me an equivalent material for the one in subject line.
  5. engiNERD77

    LOCATIONAL HOLES

    Just out of curiosity, because I've seen it done many ways and it seems to be draftsman's preference. How do you call out a press fit hole for a dowel pin when you want to ensure the pin sticks out say a 1/4 inch. We would want the machinist to drill thru but to maybe ream to a certain depth...
  6. engiNERD77

    Machine Tool Design Reference Book

    Can anyone suggest a good book for machine tool design reference? There seem to be a few on the market, but I would like one good one for reference. Something other than machinist's handbook; that deals specifically with design principles, materials and includes electrical and hydraulic...
  7. engiNERD77

    Unequally Disposed Profile

    Lol thanks for the clarification. :)
  8. engiNERD77

    Unequally Disposed Profile

    Could someone please explain this modifier for me ....like I'm a 3 year old? ;) What exactly is my worst case scenario?http://files.engineering.com/getfile.aspx?folder=8de19356-0033-4e05-a2b5-1269bf0a3e44&file=07041-04.PDF
  9. engiNERD77

    Metric Drawing?

    Did I miss something? How exactly is a minus minus tolerance read?
  10. engiNERD77

    Concentricity Gage

    Thanks B ...that seems to make sense to me.
  11. engiNERD77

    Concentricity Gage

    Here is a rough idea of what I am looking at. I hope this clarifies. Any thoughts?http://files.engineering.com/getfile.aspx?folder=ee92071a-f408-4c93-b559-3cd8b5f8d525&file=Part3.PDF
  12. engiNERD77

    Concentricity Gage

    The threaded hole is a 21/32-6 RHS 60° modified stub acme and the callout is for that to be concentric within .005 to the fore mentioned bore. Basically what we are using is an alignment gage with a threaded section on it. It just seems the existing gage with the dimensions I mentioned earlier...
  13. engiNERD77

    Concentricity Gage

    Hey guys-I am making some revisions to a concentricity gage. The features being checked are a threaded hole to a bore with a tolerance of .005. The bore dia. is .497-.503 and the gage dia. for that same bore is .483-.484. This struck me as very sloppy. I would think you would want the gage...
  14. engiNERD77

    ansi 4"-150# flange

    Thank you that seems to coorelate with what I have read. I appreciate the feedback.
  15. engiNERD77

    ansi 4"-150# flange

    does anyone know what the bolt hole circle tolerance is for these type of flanges?

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