Yes electrolytic stress free Nickel with Hard gold should give a long and
reliable service.

If voltages/ currents are high and cost is an issue against 9999 reliability
gold is unnecessary. As the wiping action removes the nickel oxide.

Electroless nickel is hard but has phosphorus. May cause problems??

Anil Kher
micro interconnexion pvt. ltd
D3-12A, Corlim Industrial Estate
Corlim, Ilhas , Goa , India 403110
tel: 91-832-2284209/337. fax 2284209/2285271
e mail: [log in to unmask]
Leaders in Gold plated PCBs - selective/ cob
an ISO 9001-2000 Company

-----Original Message-----
From: Jeffrey Bush [mailto:[log in to unmask]]
Sent: Tuesday, May 24, 2005 1:20 AM
Subject: Re: PCB Commutator

Bright Watts NI - or a hard gold plate over low stress NI.

Jeffrey Bush
Director, Quality Assurance and Technical Support

VERMONT CIRCUITS INCORPORATED
  76 Technology Drive - POB 1890
    Brattleboro, Vermont 05302
      Voice: 802.257.4571.21 Fax: 802.257.0011
           http://www.vtcircuits.com

-----Original Message-----
From: Roger M Unwin [mailto:[log in to unmask]]
Sent: Monday, May 23, 2005 3:06 PM
To: [log in to unmask]
Subject: [TN] PCB Commutator

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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