Hi Thomi,
sorry to disagree, what you described is an extreme assembly requiring very
much less than standard trim.
Standard trim is definitely much better and easier achieved by either trim
and clinch on auto inserters ,
be radial or axial, or prepping mills (manual are VERY cheap comparing to
hand trim).
That way you have
1
nothing to trim
2
no stress inducements generated
3
no exposed copper
4
no burr and very demanding machinery set issues = blade rig
5
no secondary solder complications
(extraordinary recommendation , the "wave solder again",
can see Steve double wave every customer, soldering bible in his
hands.........)
I did blade trim (and built board safe rigs :archive)on telecom space
constricted cards years back ,
believe me all of the issues combined it is NOT quicker;
this sort of remedial automation belongs to Frankenstein's era.
Sorry to forte the opinion, this memories i hoped to forget.
Would not recommend blade cutting (in line or offline) to anybody who could
avoid it,
the complications of this concept are sheer slow pain.
Thankfully the economics just about weeded out this antiquated "methods";
although some of us still persist.
Few times we prepped flat with bottom pads, as we could not risk the
mentioned,
than argued with QA about what is right , antiquated standard or
cross-sectioned verifications
of gentler, better and cheaper process.
The "solder-trim-solder" in practical terms is parallel to mechanical
typewriter .
paul
-----Original Message-----
From: Thomi [mailto:[log in to unmask]]
Sent: Wednesday, 16 August 2000 3:33
To: [log in to unmask]
Subject: Re: [TN] Electric or Pneumatic Lead Trimming
Hi Amanda,
from the book "Soldering in Electronics" by R.J. Klein Wassink - I don't
believe he is active on this forum, but Eric de Kluizenaar is, he might
comment on this - I learnt about the SOLDER - TRIM - SOLDER routine, where
you wave solder first with the long leads, then trim all at once with a
rotating knife, then wave solder again to mend any mechanical stress on the
solder joints which resulted from cutting.
This works out quicker and more automated then trimming individual leads in
whatever way.
Best regards,
Thomas Ahrens,
[log in to unmask]
-----Ursprüngliche Nachricht-----
Von: Amanda.Mountain <[log in to unmask]>
An: [log in to unmask] <[log in to unmask]>
Datum: Freitag, 11. August 2000 16:41
Betreff: [TN] Electric or Pneumatic Lead Trimming
>There is some concern within our organization about possible repetitive
>strain injuries occurring with employees who are trimming large quantities
>of leads, using manual lead trimmers. The leads we are trimming are up to
>approximately 0.06".
>
>Initially, we were hoping to purchase electric trimmers, but I have had
next
>to no luck locating electric tools. I have found a couple of pneumatic
>tools that will do the job, but we are hesitant to introduce the air lines
>to the floor (cost, safety). The pneumatic air lines also seem to be more
>cumbersome than the electric cords, making it more difficult to maneuver
the
>jaws of the tool through tighter spaces.
>
>Currently, it's looking like we may be forced to go pneumatic, or stick
with
>our manual trimmers at this point.
>
>Does anyone have any past experiences (good or bad) with pneumatic or
>electric or any related injuries that they would like to pass along?
>
>Any input will be greatly appreciated!
>
>Amanda
>
>Amanda Mountain
>Process Engineering
>Leitch Technology International Inc.
>Phone: (416) 445-9640 ext. 3852
>Fax: (416) 445-7927
>http://www.leitch.com/
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