The message to which you are about to reply is shown first. GO TO REPLY FORM



 VIEW    REPLY TO THIS MESSAGE Replies to this message will be emailed.    PRINT   SAVE 

Time and temperature 200

uid 27's pic
posted by  Art Benstein on  Mon Jan 19 00:48 CST 2009
Author: [PROFILE] [EVERY POST] [THREADS] [BEST POSTS] RSS Feed     [IGNORE ALL POSTS]
last visit: Fri Oct 17 20:10 CST 2014
[RELATED]

Before printed circuits, solder was used only to provide electrical connection, not mechanical support. In the 60's manufacturers learned how to stuff a through-hole board with every component they could get made for it and run it over a wave of molten solder. The conveyor speed and solder bath temperature got adjusted to compromise between overheating a tiny germanium diode and getting solder to stick to the 12-gauge plated steel mounting pin of an open frame relay.

The relays lost. Of course they looked OK at the time, but those outfits building high-reliability equipment (medical, aeronautics, space) could see further into the future, and at the very least hand re-touched the big heat sinkers like our Bosch relays, just like we do now.

So it is really easy for you to make these work again. Just look for the big heavy objects on the circuit board, where the only mechanical attachment is the solder itself.
--
Art Benstein near Baltimore

Generally speaking, you aren't learning much when your lips are moving.






USERNAME
Use "claim to be" below if you don't want to log in.
PASSWORD
I don't have an account. Sign me up.
CLAIM TO BE
Use only if you don't want to login (post anonymously).
ENTER CAPTCHA CODE
This is required for posting anonymously.
OPTIONS notify by email
Available only to user accounts.
SUBJECT
MODEL/YEAR
MESSAGE

DICTIONARY
LABEL(S) +
IMAGE URL *
[IMAGE LIBRARY (UPLOAD/SELECT)]

* = Field is optional.

+ = Enter space delimited labels for this post. An example entry: 240 muffler


©Jarrod Stenberg 1997-2022. All material except where indicated.


All participants agree to these terms.

Brickboard.com is not affiliated with nor sponsored by AB Volvo, Volvo Car Corporation, Volvo Cars of North America, Inc. or Ford Motor Company. Brickboard.com is a Volvo owner/enthusiast site, similar to a club, and does not intend to pose as an official Volvo site. The official Volvo site can be found here.