Another JLCPCB issue

I did notice and I think I commented on the fact their FAQ does not indicate the rotation reference point. I've not seen any references that have a two pin part vertical for a zero degree rotation. I even gave you some links in the other thread that showed the zero degree orientation of a 2 pin part is at 9 o'clock on the clock dial. Did you not see those? Also, an IC has pin 1 in the 9 to 12 o'clock quadrant, i.e. NW by the compass.

Bottom line is they give you a means of verifying visually what you will get. Where's the problem??? Why not fix your files and get on with it?

Bottom line it has to look right in their preview? WYSIWYG?

yes

I don't know what to tell you. I've given you a number of references that you seem to ignore. JLCPCB gave you a sample file that you choose to ignore until you can't anymore. If you are going to continue to blame others for your mistakes you will only continue to repeat them.

The only flaw I have seen in the info they provided you is they don't tell you to follow the standards from IPC and others setting pin 1 at 9 o'clock for SIP devices and in the upper left quadrant or at 12 o'clock for other devices. You seem to have used other, non-authoritative sources as your reference, so you had a lot of trouble with this. Now you want to take this one issue and hang JLCPCB rather than getting on with your design. They left out a piece of information which is available from other sources and is easily verified using the viewing tool from JLCPCB. Now you are complaining they give you a way to verify everyone is on the same page.

Dude! Time to get over it....

It will be interesting to solder them in that way.

Are you saving enough on assembly to pay for your time?

We put a dot on the silk to indicate ic pin 1 or a diode cathode. A decent assembler will get it right.

A decent PCB house reads fab notes too. The cheap Chinese houses don't.

fredag den 9. april 2021 kl. 02.36.00 UTC+2 skrev John Larkin:

JLCPCB will fix such obvious errors

and so will JLCPCB, but the safe and easy way is to make the files they need correct

and you pay for that ...

JLC are perfectly clear about their rotation rule. They use the same rotation shown in the EasyEDA footprint that's visible for the part on the website of LCSC, which is set up to match the orientation in which the part comes off the reel mounted on their feeder.

No, this does not match other CAD tools. But it's not as though they make any secret of it.

Fix your footprints to match the EasyEDA orientation, and everything works just fine. My first PCB certainly did.

How much is JLCPCB's competition paying you to look like an idiot? I hope it's a lot.

CH

Man, there are a few aggressive dudes here. You can't see the humor in all this? (and the inaccuracy?) (in a lot of replies as well)

Like Alfred Newman said -- "What, me worry"?

JLCPCB Support

4:14 AM (6 hours ago) to me

Hi sir or madam,

Thank you for your reply.

As to the preview / Gerberviewer on the website, it is only for the purpose of reviewing the file quickly before paying for your order.

But sometimes, there might be something wrong on the website to display it EXACTLY.

Don't worry about it .

(that's the exact message). (kind of a challenge not to worry about it).

and here's another bit of humor --

here's a sample of the pcbway centroid file --

and here's the jlcpcb sample --

Does JL have a standard list of parts? Maybe they have a standard feeder load they use on all boards. We have maybe a dozen common parts (bypass caps, 1K resistors, things like that) but have to set up for the rest. We have feeder space for 100 equivalent 0805 parts, so sometimes have to work hard to stay below that... putting resistors in series or parallel for example. That's a nuisance.

Sure. If you are building a low-margin product and your time isn't worth much, maybe that's OK.

Clifford gave me the answer I need. -- thanks Crazy stuff.

fredag den 9. april 2021 kl. 17.12.21 UTC+2 skrev snipped-for-privacy@highlandsniptechnology.com:

yes they have something like 700 "basic" parts to use for "free" and many many more "extended" parts for an extra $3 per part number

if the standard product is what you need the only time needed is picking the part numbers

When you say "perfectly clear", where did you read that? It was not mentioned on the FAQ page the OP keeps linking to. I do agree that JLCPCB web pages are not clear and it is hard to get good info on the many details. But as with many things, you get what you pay for.

I have found these pages to be very useful in selecting from the JLCPCB library of parts.

I noticed several times in the discussions of this issue people confuse JLCPCB with LCSC libraries. LCSC may be with the same company, but they carry many, many more parts than JLCPCB will put on your board.

Wow. 700 is a lot of feeders.

I have seen assembly lines with multiple pick and place machines in a row. I wonder if JLCPCB has a number of machines lined up with all 700 standard parts and your boards run the gauntlet? I expect not. That would be too inefficient with all boards and machines having to wait for the board that takes the longest time to place. I guess they have all 700 parts on reels ready to load into the machine while the other parts have to be picked from the warehouse. They kit the parts like any other assembly house and load the reels onto the machine for your job.

When I've visited assembly houses I'm always surprised to see machines sitting idle. They are expensive enough I expect them to be fed with parts and boards continuously to get maximum return on capital. But I suppose the limitations on that are not as good as would be ideal.

the picture shows five machines in series, I think it something like these

each of them takes 4 carts with up to 45 feeders so they could potentially have 900 different parts mounted by one line. I'd guess they have most of the basic part there all the time and the extended parts extra fee is for finding the reel and taking a feeder space

the picture is old, I think they have moved to a bigger place and have even more machines now

As off the bandolier is 0degrees.

How is the board oriented?

RL

Check out their video, 2:12 into it:

Snippet:

Amazing number of machines