Wrong orientation

I am a little lost on some of that, but here is what we do.

The camera view has the package outline, including an orientation indicator. The operator has the camera step through the program, and checks that the outline and indicator are correct on each board location. Also, all first pieces go through AOI before building more.

reply »

1. Add controls in programming and setup creation for polarity 2. Check polarities in actual setup before you run. They should match the paper.

reply »

This repeats a very similar thread recently. The obvious answers are given already. However there are extra/different steps that can be taken depending on where your data has come from. If you are an OEM and you are building using data that was generated in-house then you could work on making the design engineers use the same default zero degrees in CAD as your SMT software does.

Identify all polarised components on a Paper BOM and highlight them for double/triple checking. Also check the polarioty in tape/carrier is correct too.

Persuading the design Engineer/client to generate an assembly layer in the gerbers thats easy to read (silkscreen may not include everything, often doesn't)

Our Essemtec machine generates rotational and part number translation files for each defined client, so the more product we build the less work we have to do running pre production polarity checks. it also clearly shows the outline/shape of every component on the assembly image or the camera top down view. What it doesn't do is display any gerber data like an assemblly layer, whihch would be nice.

reply »

Over simplified generic method. Step 1: make a document with every part shape showing zero orientation. Specify CW or CCW. Step 2: Find every step in the process that does not follow the standardisation and adjust as needed.

The best I saw this work was with Circuit Cam programming Mydata. Circuit Cam had a set theta function where you could set every shape zero to match. We put a paper on the Mydata showing the zero orientation for basic parts. Even if a customer provided CAD with different zeros it was easy to set them to our standards. With the Mydata we told it what the angle of the part in each feeder was. So switching from reel to stick did not cause parts to be placed at the wrong angle even though it was picked up at a different angle. The key of course was consistently using the same zero orientation.

Panasonic machines have had issues. I think the main one was that their zero orientation for SOT23s was not like everyone else's and their utility for bulk importing part data had a bug in regards to angles.

Even if you can't control or compensate for CAD from outside the company at least it will be easier to spot the discrepancy if you have every shape defined. And should know that that part will cause trouble and you can manually fix it.

reply »

Hello, This software ProntoPLACE ( https://www.unisoft-cim.com/pcbplace.php ) may help and we can run a PCB project with you as a test if you wish (contact info is at https://www.unisoft-cim.com/contact.htm ). Thanks, Richard Larue . >>>>> The Unisoft ProntoPLACE software ( https://www.unisoft-cim.com/pcbplace.php ) creates programs from CAD or Gerber or XY rotation and BOM files for setup of SMT Pick & Place, thru-hole, manusert & dispensing machines, and includes the basic features of ProntoVIEW-MARKUP ( https://www.unisoft-cim.com/pcbview.php ). Most machines are supported such as Assembleon / Philips, Mydata / Mycronic, Juki, ASM / Siemens, Universal, Fuji, Contact Systems, Samsung, Quad, Europlacer, Sanyo, Sony, Panasonic, Mirae, Essemtec, Yamaha, Hitachi, MultiTroniks, Amistar, Manncorp, Robotas, Autoronik-SMT, Dima, Dynapert, KME, Zevatech, Mamiya, Novastar, Ragen, TDK, Tenyru, Tescon, TWS Automation, etc.

reply »