Re: [CAD_CAM_EDM_DRO] Question on connector used on servos

Michael Gamber <mgamber@...> wrote:
I am getting ready to wire up my servos. They are DC Brush type. The
brushes have .187 quick connects. OK to use or is soldering
necessary?

Also the encoder has .100 spacing pins that appear to be gold
plated. Do you recommend getting gold plated connectors to mate with
them? I know that encoder wiring should be as fail-safe as possible,
but will gold plating buy me anything here?

Here are some of my opinions:

1) .187 Connectors are reliable, readily available and inexpensive. Just make sure that you crimp them with the proper tool, and use the gage wire specified for the connector. The better tools have racheting action, and will not release until the connector is appropriately crimped. The inexpensive tools leave it up to your sense of feel.

An appropriately crimped connection is supposed to be "gas tight", which means the portions of the metal of the wire that are pressed against the connector should not be subject to corrosion. In other words, it should be as reliable as a soldered connection.

Also - electrical conduction occurs along the surface of the conductor, so soldering may in fact decrease, not increase, the conductivity of the connection, especially for multi-stranded wire. This is something I know in theory, but have not actually made measurements - so take if for what it's worth.

2) Gold plating. These types of connectors also are supposedly "gas tight", so that once contact is made, oxidation from the air cannot get into the point of contact. That's why (I am sure), most automotive connectors are not gold plated. However, when you disconnect and re-connect later on in the history of your machine, the connector may not make contact exactly at the same point. There's where gold is of an advantage.

Most modern gold plated connectors are selectively plated only in the area of contact, and are not much more expensive than their tin plated counterparts, especially in small quantity. I have found DigiKey, http://www.digikey.com and Mouser http://www.mouser.com , to be a good source for a great variety of connectors.

Best regards,
Arthur Volta
motion control / CNC Controls
www.abilitysystems.com


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