PSN-L Email List Message

Subject: Re: A coil or dampening plate "drop down" assembly
From: "meredith lamb" paleoartifact@.........
Date: Fri, 13 Jun 2008 20:03:29 -0600


Hi Chris,

You have a quite interesting variety of means of attachments!

Take care, Meredith Lamb

On Fri, Jun 13, 2008 at 3:01 PM,  wrote:

> In a message dated 2008/06/08, paleoartifact@......... writes:
>
> Below is a web page reference to a possible useful coil drop down (from the
> boom) approach you might consider to use with your possible 4 neodymium
> magnets and plates setup.  It could be considered "risky" for the coil but
> thats dependent on your visual alignment skill.
>
>
>
> Hi Meredith,
>
>        I would be inclined to make the fitting the same width as the coil
> and then stick mylar film over both. This should work. It is about 2 thou
> thick and it can be bought as 'copy film' for Laser Printers. Maybe use a U
> loop to enclose the coil?
>
>        You can make adhesives stick to the polythene coil former if you use
> a small blue flame to just melt the surfaces for a second where you want the
> glue to stick. This is how they get printing ink to stick on polythene
> containers.- the flame replaces the C-H3 bonds in the surface with COOH.
>
>        When I use these sort of coils, I use a countersunk nylon bolt to
> fix them to a strip of glass circuit board. It adds 0.063" to the thickness.
> The former is 0.445" wide, including the two 0.040" cheeks, so the coil is
> about 0.365" wide. You need to allow about 0.04" clearance to the magnets,
> maybe a bit less per side, making a minimum of 0.525". Adding 0.063" is not
> going to make a huge difference.
>
>        Regards,
>
>        Chris
>
Hi Chris,

You have a quite interesting variety of means of attachments!

Take care, Meredith Lamb

On Fri, Jun 13, 2008 at 3:01 PM, <ChrisAtUpw@.......> wrote:
In a message dated 2008/06/08, paleoartifact@......... writes:

Below is a web page reference to a possible useful coil drop down (from the boom) approach you might consider to use with your possible 4 neodymium magnets and plates setup.  It could be considered "risky" for the coil but thats dependent on your visual alignment skill.


Hi Meredith,

       I would be inclined to make the fitting the same width as the coil and then stick mylar film over both. This should work. It is about 2 thou thick and it can be bought as 'copy film' for Laser Printers. Maybe use a U loop to enclose the coil?

       You can make adhesives stick to the polythene coil former if you use a small blue flame to just melt the surfaces for a second where you want the glue to stick. This is how they get printing ink to stick on polythene containers.- the flame replaces the C-H3 bonds in the surface with COOH.

       When I use these sort of coils, I use a countersunk nylon bolt to fix them to a strip of glass circuit board. It adds 0.063" to the thickness. The former is 0.445" wide, including the two 0.040" cheeks, so the coil is about 0.365" wide. You need to allow about 0.04" clearance to the magnets, maybe a bit less per side, making a minimum of 0.525". Adding 0.063" is not going to make a huge difference.

       Regards,
      
       Chris


[ Top ] [ Back ] [ Home Page ]