Electronics Forum: board (Page 731 of 1638)

What is your highest Reflow Speed?

Electronics Forum | Thu Jun 19 12:28:21 EDT 2014 | jdengler

I think his units are wrong. We did a very thin board with some 0805 resistors on it at 80 cm/minute. This generated a profile a little over 4 minutes. Regards, Jerry

Using Stripfeeders on MyData Tray Wagons

Electronics Forum | Tue Jun 24 14:00:58 EDT 2014 | joekirin

We built a tray that accepts tape. It is made out of a waffle tray and board breakaways. It works very well. We use magnets to mount it on our Y-Wagon teaching it as a tray.

DEK 248 Board Fixation

Electronics Forum | Mon Jun 23 21:28:33 EDT 2014 | dekhead

Not something that pops up on used market much; but still available from DEK. P/N: 002070 I think ~$200 for a set of 4 DEKHEAD www.dekhead.com

Creating new parts

Electronics Forum | Wed Jul 02 10:11:13 EDT 2014 | emeto

Can you explain in details what you want to do. 1. do you need to create parts for your library(datasheet) 2. Do you want to create a pick and place file for a board(centroid file from CAM/CAD system)

Possibility of a cheaper pick and place machine design?

Electronics Forum | Thu Jul 10 20:30:07 EDT 2014 | andrespena

@Comatose You answered all my question about the board and operator costs, and I'm getting a good idea of how the numbers look like.

Padded static bags.

Electronics Forum | Wed Jul 09 09:01:22 EDT 2014 | rrosera

Does anyone have any experience with using padded static bags to minimize damage to boards during handling and storage? Does anyone recommend a specific brand or type?

What is a typical SMT placement defect rate?

Electronics Forum | Thu Jul 10 08:18:15 EDT 2014 | emeto

I think what you are asking for is called First Pass Yield and for us that is in the upper 90s. It will depend on the board complexity and quantity - makes big difference if you run 10pcs or a 10000pcs. Regards, Emil

What is a typical SMT placement defect rate?

Electronics Forum | Thu Jul 17 17:36:28 EDT 2014 | proy

Hi, > > If you can not rely on your programmer and > the tools he uses then "double checking" can save > you only materials but in time you really do not > save often extend meaning. There are things you > can identify before the stove, but if

Step Stencils

Electronics Forum | Wed Aug 27 15:53:05 EDT 2014 | smtdoug

I always put the step on the squeegee side. You'll get some "shadowing" effect on any parts in close proximity to the stepped up region. It should be manageable with proper board / stencil design.

How important NSMD pads are for the QFN and similar packages?

Electronics Forum | Wed Aug 27 15:50:11 EDT 2014 | smtdoug

If at all possible, you definately want solder mask defined pads. Without it, you will struggle with solder bridging. This is especially important if you have a larger size board.


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