PCB Layout -- A question of style

[Boris Mohar]

The principle is that it is impossible to build a cathedral on an outhouse
foundation. THey will learn how many layers are necessary when they have to
know that. It well may take a lifetime. Have you stopped learning?

Jim

Resist pen is an outhouse foundation. You should do something about that
chip on your shoulder.

 

[John Larkin]

What the hell does THAT mean?


It has become pretty meaningless as well with

I didn't ASK you about pick and place machines. There are places in this
world where hand stuffing is still in vogue. Why don't you simply answer
the question instead of telling us how other people do it?


And through-hole

The hell you say. Distributors are still selling equal amounts of SMD and
TH parts.




Well, I used blue and red grid sheets in the '60s and still teach them as
legacy methods to my college students. I also teach them how to lay out a
board using tape and donuts. THEN and ONLY THEN do I introduce them to
computer methods.

Now, I ask the frikkin question again (since there seems to be disagreement
on both sides) what is the STANDARD convention for using square holes to
indicate the lead of a component?

Jim

I know, but you're obnoxious, so I won't tell you.

I'm sure glad you're not *my* tracher.

John

 

[John Larkin]

The different pads styles aren't necessarily for assembly purposes
except for the engineering build that requires some hand assembly and
twiddling.

We have a couple of semiautomatic p-n-p stations, where a computer
guides an operator to pick up parts out of a carousel (or from reels)
and place them. In that case, silkscreen outlines and polarization
indicators are still necessary. We build things in 10's or sometimes
100's, and that's not enough to set up a full, all reel-fed, automatic
p-n-p run.

The silkscreens are handy for our production test and inspection
people, too. But for parts like 0603's and 0402's and such, placement
of the legends, even 50 mils high, takes as much room as the parts.

John

 

[Guy Macon]

I know, but you're obnoxious, so I won't tell you.

My irony meter just overloaded, and that's with a 40dB pad on the input.

 

[John Larkin]

My irony meter just overloaded, and that's with a 40dB pad on the input.

I'd recommend against signing up for any popularity contests yourself,
Guy.

John

 

[RST Engineering \(jw\)]

Resist pen is only used to draw the outline of the cathedral. You should
do something about that block of wood on your shoulders.

Jim

 

[RST Engineering \(jw\)]

And I'm glad that another "student with an attitude" won't be in my classes
in the fall.

Jim