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Re: [cw_bugs] bug contacts

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  • David Ring
    Excellent words, FD. Yes, I ve been talking to Vibroplex for years about putting a convex surface on their contacts - they are much less problematic
    Message 1 of 4 , Jul 23, 2008
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      Excellent words, FD.  Yes, I've been talking to Vibroplex for years about putting a convex surface on their contacts - they are much less problematic especially when polished - and if they're poliished they do a a little self-polishing as the contacts close and move slightly around.  One paper I read said that two domed contacts always make good contact no matter what the angle of contact this isn't so with two flat contacts.

      What is the buffing wheel made of?  You're able to clean, resurface and buff with it, sounds nice.

      73

      DR


      On Wed, Jul 23, 2008 at 1:14 PM, cloud runner <KT5X@...> wrote:
      Contacts can be hopelessly pitted from use with high current transmitters.
       
      The silver contact has a pin on the end and is pressed into a hole in the screw.  They easily pull out, and new ones pressed in.  You can easily do it yourself.
       
      I put the screw and old pitted contact to my buffing wheel.  I can easily buff out the pits, and leave a highly polished convex contact.  Two such polished and convex contacts will slide over one another with essentially no bounce.
       
      Once this polished convex surface is achieved, and that is not they way replacement contacts come from Vibroplex, from them they are flat and not a polished surface, merely a smooth one, thereafter one need only an occassional drop of liquid silver polish to reverse oxidation.
       
       
       
      Good ideas and second thoughts...  (a complete non-sequiter)
       
      At some point it seemed like a good idea to "keep on running."  So i have done that for fifty years now.  At age 63 I appreciate being able to run more than ever.
       
      At some point it seemed like a good idea to keep signing up to do the Pikes Peak Marathon as a personal challenge to keeping on running.
       
      At some point this morning, it seemed like a good idea to one minute high speed uphill surges as part of the preparation.
       
      Fast forward a few hours...  I'm in pain, Mike!
       
      73,  Fred - kt5x

    • cloud runner
      Well, DR, the buffing wheel I use if for jewelry. It is about six inches in diameter. i simply hold the screw facinto the wheel, it is a fabric that one puts
      Message 2 of 4 , Jul 24, 2008
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        Well, DR, the buffing wheel I use if for jewelry.  It is about six inches in diameter.  i simply hold the screw facinto the wheel, it is a fabric that one puts a buffing compound on, and it makes a convex surface without further ado.
         
        Tim, good to see you posting, and hope you are feeling OK.  While you ar a master machenst and all you say is right on, I have never had any trouble pulling the old silver contact out of the screw with a pair of pliers.  i have always been able to put the new one in by aligning the new contact on the screw vertically, and pushing down against a (work) table.  The silver pin is pretty soft.
         
        Three weeks to the Pikes Peak Marathon.  yesterday it seemed like it would be a good idea to do one minute duration steep uphill sprints.  What seemed a good idea yesterday has left me with second thoughts today!  Hah-hah !!!
         
        73 - fred - kt5x
         
         
      • elawson@inficad.com
        ... I use the rim to rim to rim Grand Canyon dayhike like you use the marathons.... I m getting ready to head up Squaw Peak. It s a bit over a mile one way
        Message 3 of 4 , Jul 25, 2008
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          Quoting cloud runner <KT5X@...>:

          > Good ideas and second thoughts... (a complete non-sequiter)
          >
          > At some point it seemed like a good idea to "keep on running." So i
          > have done that for fifty years now. At age 63 I appreciate being
          > able to run more than ever.
          >
          > At some point it seemed like a good idea to keep signing up to do
          > the Pikes Peak Marathon as a personal challenge to keeping on running.
          >
          > At some point this morning, it seemed like a good idea to one minute
          > high speed uphill surges as part of the preparation.
          >
          > Fast forward a few hours... I'm in pain, Mike!

          I use the rim to rim to rim Grand Canyon dayhike like you use the
          marathons.... I'm getting ready to head up Squaw Peak. It's a bit
          over a mile one way with a 1250 foot climb and under my hat is the
          only shady part of the trail. It's going to be around 109F....at
          least the crowds will be gone.... :-)

          Eric

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