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Recent content by bobble293

  1. bobble293

    Stress relief of machined castings

    Hi, ABritTurner, I didn't describe the strippers terribly well, hence your reply. Stripper assemblies on print machine folders have a value high enough to justify specifying bright, cold rolled stock and stress relief, and in fact, were designed to utilise standard sections, minimising machine...
  2. bobble293

    Pipes and tubes: is the difference still taught?

    Hi, My last post failed, I'm ashamed to say, answer your question, and only stated what I was taught. However, conversations with others over the past couple of years, have led me to the conclusion that their ignorance of some basic aspects of their trade is not necessarily due to their not...
  3. bobble293

    Stress relief of machined castings

    Hi, Not referring to castings here, but I drew up a part for a contractor to make (stripper bars for a Harris folder. Involved removing most of one side of the raw stock bright strip. Told him to stress relieve first, before any machining. (he was based in Sheffield, of all places) He didn't...
  4. bobble293

    Pipes and tubes: is the difference still taught?

    Hi, To me, tube is defined primarily by its O.D, then by its wall thickness, pipe by its NOMINAL bore, then by its wall thickness, though not the measurement, just the "weight" light, medium, heavy. Pipe O.D must necessarily remain more or less constant for a given nominal bore, or threading...
  5. bobble293

    Standard Names For Stainless Steel

    Hi,EdStainless, unexpectedly quick response! The reason I consider seamless necessary for the larger tube, at least, is because of the longitudinal weld bead on the inside. It'll have an "O" ring or "X2" ring piston seal running inside it. Less of an issue for the smaller diameter tube where...
  6. bobble293

    Standard Names For Stainless Steel

    Hi, lots of useful info here, especially from EdStainless. If only it were so easy this side of the pond. I'm looking to source the following:- Cold drawn SEAMLESS stainless tube 1) 1/2" O.D. x 16 SWG., and 2) 5/16" O.D. x greatest wall thickness available, for rigidity. This is for a low...
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