connector hell

[Tim Williams]

Saw a Harwin D-sub datasheet that legitimately and utterly screwed up the
drawings, completely wrong view, or pin 1 on the wrong side, something like
that, I forget. Fortunately the customer noticed something fishy on review!

It's never done until the part and calipers are in your hands. Until then
it's just guesswork!

I think it's really amusing (somewhat in a "well, fuck me" sort of way) that
most manufacturers give out STEP files, that are almost always more accurate
and representative than their very own datasheets, but that they always
disclaim them as "for reference only" and such.

I really should insist on pre-buying samples of everything I work with, but
it seems such an unnecessary step for the most part. And D-subs, those
things have been around for almost a century, MUST be fine, right?

The other part I'm fond of shaming, is a cell holder (CR2032 or such, SMT)
by MPD. Only the side-of-barn-sized global tolerance is given, which if I
were to follow properly for all position and diameter dimensions as labeled,
would require holes for the alignment pegs which are big enough to fit
either peg (plus enough positional and rotational error to just about fully
miss one or both pads). It was something like, an 0.8mm and a 1.0mm peg to
set polarity and alignment -- the tolerance was 0.25mm, applied to not just
the diameters, but the spacing as well.

Tim

--
Seven Transistor Labs, LLC
Electrical Engineering Consultation and Design
Website: https://www.seventransistorlabs.com/

"Winfield Hill" <hill@rowland.harvard.edu> wrote in message
news:qbl3l80ap6@drn.newsguy.com...

Kyocera 6200067012800 connector bottom-view
drawing, actually shows top view. Arrggh!
Discrepancy should have been obvious.

Examining actual part revealed the truth,
but only after placing the PCB order.

Ha, could mount connectors on the bottom.

https://www.dropbox.com/s/b1peq3xzwdph3us/006200067012800%2B_1mm_6-cond_RA-TH.pdf?dl=0


--
Thanks,
- Win

 

Rick C <gnuarm.deletethisbit@gmail.com> wrote in
news:2ef03703-752a-4903-adc2-bf76269ff5e1@googlegroups.com:

On Friday, May 17, 2019 at 1:07:13 AM UTC-4,
DecadentLinux...@decadence.org wrote:
Winfield Hill <hill@rowland.harvard.edu> wrote in
news:qbl3l80ap6@drn.newsguy.com:

https://www.dropbox.com/s/b1peq3xzwdph3us/006200067012800%2B_1mm
_6- cond_RA-TH.pdf?dl=0

The note "insert direction" was no hint?

That doesn't tell you a thing about which view you are looking at.

Two triangles for lead positions? Seems non symetrical in a very
identifiable way.

 

[Jasen Betts]

On 2019-05-17, Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> wrote:

On 5/17/19 12:03 AM, Rick C wrote:
On Thursday, May 16, 2019 at 10:35:06 PM UTC-4, Martin Riddle wrote:
On Thu, 16 May 2019 19:24:25 -0700 (PDT), Rick C
gnuarm.deletethisbit@gmail.com> wrote:

On Thursday, May 16, 2019 at 9:44:22 PM UTC-4, Winfield Hill
wrote:
Kyocera 6200067012800 connector bottom-view drawing, actually
shows top view. Arrggh! Discrepancy should have been obvious.

Examining actual part revealed the truth, but only after
placing the PCB order.

Ha, could mount connectors on the bottom.

https://www.dropbox.com/s/b1peq3xzwdph3us/006200067012800%2B_1mm_6-cond_RA-TH.pdf?dl=0



I don't see anything on the drawing that would make me think this was
the bottom view. What am I missing?


The American convention for showing views on a drawing is opposite to
the European one (of course).

The position of views in an American drawing is as though you were
sliding the part around inside a bowl. On that convention, Win's
right--the view he marked in red ought to be the top view.

In a European drawing, the views are positioned as though you were
sliding the parts on the _outside_ of the bowl (i.e. on a convex
surface). On that convention the marked view is the bottom.

It's always nice when manufacturers label a couple of the views so you
can figure out which convention is being used.

The contentious illustration is neither first angle nor third angle
orthographic. It's the drilling pattern with the part outline
overlaid.

The drawing above it appars to be third angle.

However it appears to be symmetrical, I don't see what the fuss is about.

If you've got the pins backwards maybe you can fold the end of the flex and insert
it upside down.

--
When I tried casting out nines I made a hash of it.

 

[Wolf Bagger]

On 2019-05-17 05:53, DecadentLinuxUserNumeroUno@decadence.org wrote:

But just like we know that doctors are just 'practicing' till they
get it right, We learn, sometimes only, through practice.

Doctors practice by practising though.