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  1. Peter the Engineer

    Alodine/Chem Film Defect

    Thanks Everyone! Etching the oxides could be a tricky balancing act between making sure all the oxides are gone and making sure dimensional change is kept at minimum.
  2. Peter the Engineer

    Alodine/Chem Film Defect

    Hello, I recently received multiple parts with the same kind of defect after being treated with chem film and anodizing. I took a picture of it (please see below). I am wondering what might have caused this "bleeding". This had also happened in the past, but the company doing the plating...
  3. Peter the Engineer

    Location Tolerance for ID or OD Acting as Secondary Datum Feature

    Wow thank you all so much! I wish I had known this forum earlier. I'm a rather slow learner, and it takes me 1.5 hours in average to understand a single page in the 2009 standard book.
  4. Peter the Engineer

    Location Tolerance for ID or OD Acting as Secondary Datum Feature

    Hi, I am fairly new to GD&T and still learning from the 2009 GD&T standard book. I noticed that if an ID or OD is used as a secondary datum feature, it is usually not given a location tolerance. Only perpendicularity tolerance is used. Fig 4-9 and 4-15 from the standard illustrate this. The...
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