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  • Users: djhurayt
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  1. djhurayt

    Cr vs. CrAg plating

    We have the same part offered by two difference vendors. On one vendors part the plated area is plated with 100% Cr per SEM analysis. The SEM on the other parts show the plating to be 95% Cr and 5% Ag. My question is (with little knowledge of chrome plating) what is the purpose of the...
  2. djhurayt

    copper crush washer specification number: ???

    Can somebody point me to specs that govern the copper crush washers that are used in automotive braking/hydraulic systems?
  3. djhurayt

    pressure relieving proportional valve oscillating

    We are trying to replace a manually controlled pressure reliving valve in a very simple hydraulic system with a Parker AP04G2YP21CN valve. hydraulic circuit However every time we start to energize the valve (increase pressure to the application) the valve oscillates uncontrollably. As we try...
  4. djhurayt

    shuttle valve piston Gtol

    Any suggestions on how best to control the six ground diameters of a shuttle valve piston. The perfect part would have: 1) all the diameters exactly the same 2) all the diameters concentric with each other Thoughts: 1) let one end be datum A, the other datum B and a callout for total runout of...
  5. djhurayt

    XRF analysis of 430F vs. 430FR

    Will I be able to distinguish which identical geometry parts are made of 403F 430F and which are 430FR. Situation: I had two groups of samples annealed. Unfortunately there appears to have been parts mixed as my two bags of samples no longer contain the same number they went out of with. My...
  6. djhurayt

    not a disaster (yet), but certainly a rework failure

    Clemson University student apartments at 114 Earle which opened in August 2017 has experienced first floor concrete cracking and settlement. Apparently they attempted to repair the cracks via expanding foam. However the crack seem to have effected more than just the floor. It looks like the...
  7. djhurayt

    flatness of a conical surface

    A vendor has suggested that we use a flatness straightness (I don't know which one of these voices in my head was thinking flatness, I'll get on him about that if I every find out who it was [hammer]) call out as shown. I'm not sure I fully understand what this is really accomplishing but even...
  8. djhurayt

    datum call out on section view

    Scenario round part with multiple diameters one of the diameters is a datum this diameter dimension has the datum flag attached to the extension line, directly in line with the dimension line Question: What is the proper way to identify this datum on other views? do we: A) just attached it...
  9. djhurayt

    test for chrome after stripping operation

    We have chromium stripped from some components for rework. Is there a test to determine if all the chromium has been removed? TIA david
  10. djhurayt

    continuous feature and datums

    A have a pin that I am struggling with the best way to control this thing. This is a precision pin with tolerances down in the single digit micron level. 1) In the attached image (upper one), does my use of "3X", "CF" and the dimension for the fourth feature of the same size diameter properly...

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