Hi!
On 2/1/23 19:01, Alan Pearce via groups.io wrote:
Yeah, well, that is most likely a chat bot with no-one on theother end. That seems to be the case with those things as I understand it.
I had the impression there was a human at the other end.
But good point. Next time, I'll ask a sqrt(64)+34=? question before I
continue wasting my time.
While they use identical pictograms they DO dimension correctly
for the dimension they are providing, and if one can't follow the dimension lines ...
I tend to disagree:
Via-to-Track = 0.254mm = PictureX
PTH-to-Track = 0.33mm = same PictureX
NPTH-to-Track = 0.254mm = same PictureX, which, btw. shows a PTH and not a NPTH.
A difference between track-pad and track-track spacing will be normal
to allow for soldering of pads.
I disagree when details are missing.
JLCPCB's seems to be mixing up PTH / NPTH and non drilled SMT Pads.
Anyway:
It seems to be advisable to send them your data to check their rules
for you. Maybe they are right, then. Only if you get a written
commitment, you can pull the trigger to go.
I have a good set of rules for my boards settled over the years which
can be manufactured at a known set of HDI-Houses. And I know where
the limitations are of some of them. Those are mostly originates not
due to the design rules, but more like in their manufacturing process.
E-Test failed because of open Vias (aspect ratio was 8:1 and they said
they are able to do that) because there was air trapped in the Via
(A shaker/vibrator thingy in the chemical bath was broken.)
Or we had Via barrel ruptures because of a failed de-smearing process.
The E-Test was okay after manufacturing... but after soldering we
ran into failing boards... You can guess, it was an lengthly discussion
about who will be responsible for the damage.
Good that we saved soldering temperature profiles...
Greets,
Clemens
On Wed, 1 Feb 2023 at 16:44, Clemens Koller <cko@... <mailto:cko@...>> wrote:
Hi!
The <>
are IMO inconsistent in many aspects. Identical pictograms are used
for different values, indeed leading to confusion.
And I asked the staff directly via the online chat, why there is a
difference in between track-pad (PTH) spacing vs. track-track spacing.
The answer was "pls wait"; then "still checking" and then
"The chat has been closed due to long user inactivity."
-> good luck.
Greets,
Clemens
