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Re: [hameltech] 45GD information

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  • michael eby
    I think that an actual picture or drawing showing magnet placement and polarity plus the oscillator plus top rejection magnet polarity would help Travis and
    Message 1 of 2 , Jan 17, 2003
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      I think that an actual picture or drawing showing magnet placement and polarity plus the oscillator plus top rejection magnet polarity would help Travis and others visualize the 45GD better. Check our file and pic section. Hope this helps.
      Mike E.
       
      ----- Original Message -----
      From: Steven Dufresne
      Sent: Friday, January 17, 2003 8:05 PM
      To: hameltech@yahoogroups.com
      Subject: [hameltech] 45GD information
       
      Previously, you (Travis  <Caesar2001_2000@...>) wrote:
      ... a lot of questions :-)

      Okay, let's try this minus signs and slashes thingy again.
      It's Friday evening and I got nowhere to go...  Plus, it'll
      give us something to point to in our emails.  Copy freely
      for discussion and questions.

      Here's a 45GD (not to scale):

      +----------------------------------------------+  <== cover
      ||                  +---S---+                 ||
      |                  |       |                 |   <== drum top rejection
      |                  +---N---+                 |       magnets
      |                                            |
      |                  +---N---+                 |   <== cone top rejection magnet
      |       +--+       +---S---+      +--+       |
      |WW+--+ |SN|----------------------|NS| +--+WW|
      |WW|NS| +--+\                    /+--+ |SN|WW|   <== WW is a wood insulator a
      |WW+--+      \                  /      +--+WW|       the ring magnets are
      |             \                /             |       attached to
      |              \              /              |
      |       +--+    \            /    +--+       |
      |WW+--+ |NS|----------------------|SN| +--+WW|
      |WW|SN| +--+\                    /+--+ |NS|WW|
      |WW+--+      \                  /      +--+WW|
      |             \                /             |
      |              \              /              |
      |       +--+    \            /    +--+       |
      |WW+--+ |SN|----------------------|NS| +--+WW|
      |WW|NS| +--+\                    /+--+ |SN|WW|
      |WW+--+      \                  /      +--+WW|
      |             \                /             |
      |              \              /              |
      |               \            /               |
      |                \          /                |
      |                 \        /                 |
      |                  \      /                  |
      |                   \    /                   |
      |                    \  /                    |
      |                     \/                     |
      |             +----------------+             |
      |             +----------------+             |
      |              <O>    <O>   <O>              |   <== oscilator, all three
      |             +----------------+             |       balls shown, magnets
      |             +----------------+             |       not shown
      +--------------------------------------------+

      The above is a view as if you'd taken a saw and cut straight down the
      middle of the 45GD and took half of it away.  Well, almost, I'm not
      showing the cones cutaway as that would add confusion.

      Now, Travis, the magnets are the things that say NS or SN, the
      S being the side that is the south pole of the magnet and the
      N being the side that is the north pole of the magnet.

      Your question was, do the ring magnets provide vertical support for
      the cone rim magnets?  The answer is yes.  How?  Well in the diagram
      above, there are things like this:


      |       +--+  
      |WW+--+ |NS|--
      |WW|SN| +--+\
      |WW+--+      \
      |           

      The magnet on the left is a ring magnet.  It is actually one of a ring
      of magnets that is attached (by the wood) to the drum wall.  The magnet
      on the right is a cone rim magnet that is attached somehow to the
      rim of the cone.  Notice that the cone rim magnet is higher than the
      ring magnet.  It is this difference in height that provides the
      vertical support.  The N of the come rim magnet to attract to the
      S of the rung magnet, meanwhile the two N's keep them appart.

      In fact, you have to get the height difference just right.  If we
      were to raise the cone rim magnet too high, it would leap up and
      leftward onto the top of the ring magnet and end up like this:

          +--+
          |NS|--
      |  +--+\  
      |WW+--+ \
      |WW|SN|   
      |WW+--+  
      |        

      If the cone rim magnet were too low, you'd end up with something like
      this (basically the cone would be tilted with this end down):

      |   
      |WW+--+
      |WW|SN|   
      |WW+--++  /
      |     /S\/---        
            +N /
             \+

      Does this help?

      -Steve


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