How about...
Minimum 100 micro-inch SULFAMATE DUCTILE NICKEL PLATED
Minimum 10 micro-inch HARD GOLD PLATED

-Chris




                       Roger M Unwin
                       <[log in to unmask]        To:   [log in to unmask]
                       .UK>                              cc:
                       Sent by: TechNet                  Subject:    [TN] PCB Commutator
                       <[log in to unmask]>

                       05/23/2005 03:05 PM
                       Please respond to TechNet
                       E-Mail Forum; Please
                       respond to Roger M Unwin







Hi Technetters,

Any suggestions for a good hard wearing finish that would extend the
life of 3oz copper tracks being used as a sort of commutator. Am told
that first prototypes were made with chemical (Electroless?) gold over
nickel. Some lasted well, others not so well. Brushes are metal, sorry
don't know the composition. Approx. 5 amps current passes through
connections.

Thank you for your assistance

--
Roger M Unwin
P+M Services (R) Ltd     Tel :  01706 815212    Fax : 01706 818636
Http://www.p-m-services.co.uk

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