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In Solder Rework/Repair, Solder Training and Tools

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Nov 2010 Vol. 2, Iss. 35

 

Dear Subscriber:

With the election season behind us we look forward to the last few months of 2010.

If you are still trying to get certified by the end of the year in either the new JSTD or IPC-A610 "E" versions make sure you call Katy to reserve your spot in either November or December.

In this months' newsletter we deal with the topic of baking out PCBs for lead free rework, SMT metal \ stencils and we present some alternative turkeys for your thanksgiving table.

In terms of recently published work by BEST, check out the latest articles on SMT rework rework here or here. We have also posted new training videos on YouTube here and here.

I also invite you to listen to the BEST fanfare which you can launch from our home page. Our summer intern, who  is studying the trumpet was the creative force behind this uplifting tune.

Bye for now

Bob Wettermann
President, BEST Inc.
CktBdAnimated

PS-Take a look at our new JSTD001-D to E Webinar.

 

Treating PCBs as MSD Devices?
              PCB Delamination

As a general rule it is a good idea to bake out PCBs being used for lead free rework. A general rule of thumb for  rework of FR4 and flex based materials is 125 degrees C for 8 to 12 hours to insure that all moisture absorbed into the PCB materials are driven out.

One needs to be careful to consider all of the components on the already-populated PCB that will be subject to the bakeout. Batteries, underfilled or glued components and connectors are the most common components which will need to be investigated for their heat withstand characteristics. Either parts will need to be removed or one must decrease the temperature while increasing the length of bake out at a lower temperature in order to get around this limitation.

With the higher incidence of delaminating due to moisture absorption inside the laminate during lead free rework process the boards need to be handled as MSD devices. The presence of moisture and higher peak reflow temperatures simply compound the problem.

The downside of this baking process is the potential for a negative impact on solderability of the surface finish of the PCB.

Call Laura Ripoli at (847) 797-9250 if you have a project requiring this type of part lead free rework.

 
Does the Metal Used in SMT Stencils Matter?
 

PHD material is a high Nickel content stainless alloy used by BEST to make SMT metal stencils. The grain structure is smaller, the heat withstand properties are superior to standard stainless steel and the thermal stability is better than other stainless steels.

SSteel Grain Structure
Grain Structure of Typical SS Structure (Left) vs BEST Metal Stencils (Right)

The BEST material gets you better print results. The superior release characteristics means that you get higher print resolution. The smoother walls and the lack of grain bias means there are fewer areas for the solder paste to "hang up". The paste is more easily released, and results in a superior print quality.

A flatter stencil is the result of this material. Flatter stencils insure the coplanarity of the stencil to the PCB during the printing process. This means that there is less chance for smearing. The end result is a better print!

Call Katy Radcliff at (847) 797-9250 to see how we can make you an evaluation stencil today!

 

Different Turkeys for Thanksgiving
                                            
              

Looking for something different to serve this Turkey Day?  Shaped like a turkey, the perfect addition when nonvegetarians like Steve Jobs comes over for dinner  for the holidays.
                     

On the complete opposite side of the spectrum how about a pre-stuffed turkey with alligator meat. Pure carnivorous eats!

 
TABLE OF CONTENTS
 
PCBs as MSD Devices?
Superior Metal Stencils
A Different Kind of Turkey
 
QUICK LINKS
 
 
Metal Stencils
BGA Reballing Preforms
PCB Repair Kit
 
 
Last JSTD-001 and IPCA-610 and IPC7711/21 Classes for 2010
 
PCB AssemblyBEST will be holding the following instructor (CIT) classes in the last several weeks of 2010:

IPCA610 12/6-12/9
JSTD-001 11/
29 -12/ 3
IPC 7711/21 12/13-12/17

Call (847) 797-9250 and speak with Katy.

 
"StikNPeel(TM)" Rework Stencil
BEST Mobile Training Center
BEST has developed a new "StikNPeel" rework stencil which insures board to stencil coplanarity. It is flexible for tight space fit requirements and does not need to be cleaned. This makes for a more repeatable, faster rework process.

These stencils are available in either 4,5 or 6 mil thicknesses.

COST: ONLY $80.00 for a package of (10) stencils.


Order here.
 
VOCAB- Word of the Month
Vocab

hagiolatry

"hag-ee-OL-uh-tree, hay-jee- " which is a noun

The vocabulary you use tells others your level of intellect.

Definition/s:
1. The worship of saints, OR
2. Treating someone with undue reverence.

Usage
" The doctor  will still occupy a good position in our national pantheon even if we discard hagiolatry and subject him to a more mature historical evaluation."
Custom Thermal Shields from BEST
BEST Thermal Shields

These custom insulators are available in mica, fish paper, aramid paper, kapton, polyimides as well as a host of others.  Maximum sizes which can be processed are 200 x 200mm with minimum features sizes of 0.15mm.
 

SOLDERING TIPS

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Newsletter

WHAT'S NEW?

ARTICLE: Multiple Methods for Applying Paste Flux or Solder Paste for BGA Rework

ARTICLE: IPC-A-620 Gets a Facelift

 

 

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