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March 1998

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From:
Paul Klasek <[log in to unmask]>
Date:
Fri, 20 Mar 1998 09:25:28 +1100
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"TechNet E-Mail Forum." <[log in to unmask]>, Paul Klasek <[log in to unmask]>
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Sounds like a cultural shock Mike ;
my two $ worth :
No CC problems experienced on LP mask.
Environmental > Handling of that much open metal , Cu or Pb/Sn , can not
be healthy at all . For the metal especially .
Mf. advantages > The mask contains to a GREAT degree the run of solder (
that is the amount of solder used [qty] AND the definition of joint
shape [qly] . The same apply to heat dissipation , = over the length of
runned tail of molten solder the dissipation is much greater ; the mask
effectively acts as a heat relief in this indirect form , you should
have considerable savings on TIME, = $ again .
That is ; you work with half solder in half time .

Give girls the choice on pilot batch , let the boss ask and check . Sure
he'll be surprised .
Mind you it is quite stylish to ride horse carriages nowadays ; if you
have the money and time , ( QE II ) .

PS
Check the HGlue as well ; as you said , it stick no problem , but also
sounds bit archaic ;
the time it takes ! There are better ways . EFD makes neat and simple
measured dispensers handling 10oz cartridges ,
you'd speed up the process 10x with reasonable compound (Loctite, Dow C,
etc.)

See you Mike                      paul ; ResMed

NB
You may hear ghosts from past when lateral analysis was unknown ( E. de
Bono can cure some of them );
there is a difference of looking at it , and seeing it .


>----------
>From:  Michael Moody[SMTP:[log in to unmask]]
>Sent:  Friday, 20 March 1998 6:10
>To:    [log in to unmask]
>Subject:       [TN] Simple Solder Mask Question
>
>I have recently changed companies.  The large company I used to work for
>used solder mask on all the boards...  These boards were high-volume, smt
>boards.
>
>My new company uses all hand-soldered, through-hole boards with no solder
>mask.  When I asked about this
>I was given the following explanations:
>1) Extra cost
>2) Conformal Coating issues with solder mask
>3) Hot Glue can't adhere to the solder mask ( I tried this and it seemed ok
>to me)
>
>My boss has essentially said that they have always done boards this way and
>he needs a reason to change..
>
>I need the following help:
>
>Cost factor delta for solder mask
>Any conformal coating issues
>Any enviromental advantages obtained with solder mask
>Any manufacturing advantages with solder mask for hand-assembled boards...
>
>
>Thanks
>Mike
>
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