Sorry for the delay in replying to those who provided ideas but I have had a
couple crazy days.  Thanks for all the suggestions.  There are some good
ones and I think I will pass most along to my customer.   I will try to
describe a little cleared what the set-up is.  The ferrous vane is currently
cut from stainless and blocks or more accurately interrupts the magnetic
field between the magnet and the Hall.  I will try an ASCII picture to give
a rough idea of the profile

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  |______________________



Hopefully you get the idea.  The application is outdoors so likely the
corrosion resistant properties of the stainless are a benefit.  The idea to
go to a PCB is just to eliminate the high cost of laser cutting the
stainless and the lead time issues associated with the process.  I have
already passed along the idea of nickel plating to the customer and they
think that might work.



Thanks again.



John Parsons

  _____

From: R Sedlak [mailto:[log in to unmask]]
Sent: Friday, July 14, 2006 1:36 PM
To: TechNet E-Mail Forum; John Parsons
Subject: Re: [TN] Ferrous Plating of PCB



Unclear if I understand the geometry of what is needed, but there are some
nice magnetic oxides, which could be incorporated in a paint, and "painted
on"?

I know they sell these oxide in hardware stores, to allow you to paint a
wall, and stick magnetic notes to the wall.   This might be a lot easier
than plating.

Rudy Sedlak
RD Chemical Company

John Parsons <[log in to unmask]> wrote:

Happy Friday!



I have a customer designing a product which incorporates an interrupt switch
composed of a Hall IC, magnet and ferrous vane. Currently the vane is made
of laser or water jet cut ferrous stainless. They would like to reduce the
cost and lead time of producing the vane and are asking if a ferrous
material can be plated to a PCB.



Does anyone in the group have any thoughts or experience that they can
share?



Regards

John Parsons




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