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
   
In a me=
ssage dated 2008/06/08, paleoartifact@......... writes:



Below is a web page reference t=
o a possible useful coil drop down (from the boom) approach you might consid=
er to use with your possible 4 neodymium magnets and plates setup.  It=20=
could be considered "risky" for the coil but thats dependent on your visual=20=
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 Lase=
r Printers. Maybe use a U loop to enclose the coil? 



       You can make adhesives stick to the pol=
ythene coil former if you use a small blue flame to just melt the surfaces f=
or a second where you want the glue to stick. This is how they get printing=20=
ink to stick on polythene containers.- the flame replaces the C-H3 bonds in=20=
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 ad=
ds 0.063" to the thickness. The former is 0.445" wide, including the two 0.0=
40" cheeks, so the coil is about 0.365" wide. You need to allow about 0.04"=20=
clearance to the magnets, maybe a bit less per side, making a minimum of 0.5=
25". Adding 0.063" is not going to make a huge difference.



       Regards,

       

       Chris