Electronics Forum | Thu Jul 21 02:45:51 EDT 2005 | Base
Probably very far-fetched, but I can think of a scenario like this: - machine picks up a component - between vision and placement the part is lost, but the loss is not detected due to oversize tool, which causes the amount of vacuum drop to go unnot
Electronics Forum | Mon May 19 17:17:41 EDT 2003 | JB
We currently use a Universal GDM for our glue dispensing applications, piston pumps. My question is: Have you had any problems with air getting in the dispense system that will cause missing dots? If so, how have you approached to this problem? Int
Electronics Forum | Thu Jan 10 22:55:24 EST 2002 | davef
You are sure taking you sweet time getting this thing running. You're getting too much beach time. NOZZLE SELECTION Typically, the only rule of thumb that applies to choosing the correct nozzle ID is that it should be one half of the required dot d
Electronics Forum | Mon Oct 21 10:05:53 EDT 2002 | John S
We just started using DEK's pump print process on a high volume SMT line. We are using Hereaus 955. It works well for most components, but we have an issue with missing/partial glue dots on large diameter deposits (0.050"). The stencil will be com
Electronics Forum | Fri May 26 05:54:40 EDT 2000 | Sal
For the past year now we have been printing adhesive with no real problems. Our printing ranges from 0603's to SOIC using a variation of aperture sizes and metal thickness foils. The crucial parameters are : aperture sizes : These obviously depend o
Electronics Forum | Wed Dec 22 14:21:13 EST 2004 | James Dornan of APE Inc
A little late but if this subject is still of interest the following paper from APE may be of interestwhen considering IR to Air Bath: HOT AIR versus IR and other convection Rework Systems HOT AIR is the most popularly chosen method of rework in th
Electronics Forum | Fri Mar 19 13:26:19 EST 1999 | Scott Cook
| Hi folks, | | I am looking for inputs on a long-standing problem encountered in our shop: Bottom-side parts (passives) falling off in the Wave...where the only remnants of the part is a flattened glue dot of proper diameter and volume, and somet
Electronics Forum | Mon Jul 30 15:28:25 EDT 2007 | gmoritz
I'm posting a diary of the major repair experience that we had this weekend. I'll follow up with a shorter post that sort of summarizes a few things. ------------------------------------------------ The service guys showed up at our facility about
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