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Recent content by crun

  1. crun

    NDT of Polycrystaline Diamond

    This is merely a suggestion because I have not actually tried it on something made from PCD, but perhaps dusting the article with Zirconium powder and brushing the excess off before inspecting it under a blacklight lamp (UV) would cause the powder caught in any crack or imperfection to...
  2. crun

    Force required for cold forming

    I'd suggest getting hold of a copy of "Tool and manufacturing engineers handbook" from your library service (it is expensive to buy a copy like I have) The ISBN reference number is 0-07-059558-5 and it is published by McGraw-Hill Book Company written by Society of Manufacturing...
  3. crun

    Lexan Tubes and Vapor Polishing

    It is a tad difficult to answer a question about where to get chemicals in any sort of specific way without some idea of where the person asking the question actually lives. (I live in New Zealand - next stop south being Antarctica) Added to that is the fact that most countries have rather...
  4. crun

    Lexan Tubes and Vapor Polishing

    Vapour polishing of acrylic plastics involves the use of a chemical called Dichloromethylene (also known as Methylene dichloride) - there is a better than even chance that this stuff will work on polycarbonates too. I have some notes on the subject somewhere around the place but have not been...
  5. crun

    Can Creosote be emulsified?

    Can anyone tell me if it is possible to emulsify creosote and, if so, what could work as an emulsifier? The problem I have been given is to work backwards from a sample of an oil-based preparation that smells quite strongly of coal tar. The original stuff removes chloride/ chlorate traces and...
  6. crun

    fine threads versus coarse threads

    An easy way to get a clear mental picture about the clamping force of fine threads compared with coarse is to think of the thread helix angle as being the inclined surface of a wedge. A long thin wedge can easily be hammered in to lift a heavy weight (fine pitch thread) while a steep wedge...

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