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twist and camber
3

twist and camber

twist and camber

(OP)
New at a job designing HDMI connectors. Still learning a bunch, appreciate it if anyone would care to explain a few terms on an engineering drawing I'm looking at:

Finish:
Ni UNDER PL
GOLD PL
TIN (MATTE)

[Matte is the question I have. Is it referring to it being the top layer of plating?]

Camber: 10 MAX/1000
Twist: 20° MAX/1000

FLEXED THE SIDE CUT FORM BY DIE DESIGN

It's a Japanese Engineering drawing

Thanks much

Casey

RE: twist and camber

2
Nickel underplating on top of the actual material.
Gold plating over the nickle.


The tin is put on as a non-shiny rough layer good for soldering. I don't know what part you have there but rarely is tin put over gold. I suspect the tin is on the other end of the pins for soldering.

The tin matte is the replacement for the superior but non-RoHS tin-lead plating.


Camber is the maximum bent-angle seen in 1000 units.
Same idea with the twist.

Keith Cress
kcress - http://www.flaminsystems.com

RE: twist and camber

Matte (finish) means the tin surface will be rough. If it was smooth it would be shiny. Shiny surfaces are typically harder to get an electrochemical bond (i.e. solder).

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