Tag Archives: solder paste

Calculating Optimal Solder Paste Printing Aperture Parameters

Folks, A while ago, I developed an Excel-based spreadsheet, StencilCoach, that calculates optimal stencil aperture parameters for several common SMT solder paste printing applications. These applications include standard apertures, passive apertures, pin-in-paste (PiP) apertures, and preforms with pin-in-paste (PiP+) apertures. … Continue reading

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The Limits of Mixing: A Chocolate Chip Example

Folks, We tend to think of mixing as something that can completely even out those things being mixed. As an example, let’s assume you are making chocolate chip cookies and would like to have 10 chocolate chips in each large … Continue reading

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Weibull Part III

Folks, Our discussion of Weibull Analysis continues…. Let’s say you have worked hard and assembled some SMT lead-free PCBs for thermal cycle testing. You used the best lead-free solder paste and some lead-free solder preforms as you assembled several through-hole … Continue reading

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Can Your Mortality be Modeled with Weibull Distribution?

Folks, In the last posting we saw how Weibull analysis helped us to determine that SACM lead-free solder (SAC 105 with about 0.1% manganese) has comparable (actually better) thermal cycle performance versus SAC 305 solder.  Software like Minitab will give … Continue reading

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No More Cookson

If you read this announcement about Cookson splitting in two the first question must be, what will this mean for the organization? My take is, not much. Here’s why: 1. The company will remain public, and the shareholders are the … Continue reading

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On Stats and Solders

Folks, Everyday, we are exposed to the results of surveys and polls. A typical example might be that President Obama is leading Mitt Romney in a poll by 48% to 45%, but the results are not statistically significant. A reasonable … Continue reading

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The Price-Profitability Paradox

Let’s see how Patty and Pete are making out on their latest adventure…. “Here is the ProfitPro output,” Dave Ferris said as he pointed to a PowerPoint slide on the screen. Just then, the site general manager, Sally Wilson, and … Continue reading

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In Search of a Problem to Solve

It has been a while, let’s look in on Patty … Patty had to admit that she was very fortunate. She had yet to turn 30 and she was a Senior Vice President at ACME.  There was even a small article … Continue reading

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Talking Cleaning with Mike Bixenman

Folks, There is a lot of interest in cleaning PCBs assembled with no-clean solder pastes. Recently I discussed the topic with my good friend Mike Bixenman of Kyzen. Dr. Ron (DR): Mike, many of the best performing lead-free and lead … Continue reading

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Patty on Call

Let’s see how Patty is doing with the latest crisis … Upon hearing Claire Perkins inform her that Rob was in the hospital, Patty froze and her face looked ashen. She quickly recovered and got her cell phone out to call … Continue reading

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