Terry Jeglum

Terry Jeglum has submitted responses to the following questions.

Solder Paste Viscosity
In using solder paste for circuit assemblies, one needs to test and understand the various rheological properties of a solder ...

Flux Oozing from Insulated Wires
The law of physics is the answer. Wires are fluxed (in your case to much) and when dipped into the ...

Fastening Surface Mounted Connectors Before or After Refow?
Always secure connectors or any mounted hardware prior to soldering if within the tolerances of the assembly process. If it ...

Benchmark Price for Contract Assembly
Let's say that there are 1600 components on the assy. Big PCB. You are running a 35,000 per hour placement ...

Pick and Place Placement Rate
There is only one sure fire way to know which machine will perform best on any given task and that ...

DI Water Resistivity Check
DI water has variables and in many Dl water applications you need to know the precise quality. Resistivity/conductivity is the ...

Pros and Cons of Cleaning No-clean
There are lots of reasons to remove no-clean flux residues from PCBs. Cleaning came to no-clean fluxes when problems emerged ...

What is the Proper DI Water Resistivity
Ionic contamination testing is required as ionic residues remaining on both the PCB manufacturing process and the soldering process may ...

Reflow Solder Process Issue
To minimize the occurrences of solder robbing during reflow, the profile should be modified to have a longer low temperature ...

Tg and Td for lead free process
The glass transition temperature should be determined using the Thermo-Mechanical Analysis (TMA) method as per IPC-TM-650, 2.4.24C[3]. The TMA method ...

Lead-free soldering term?
A crack in the solder joint formed by the metal pulling itself apart while cooling in the joint or a ...

Should we buy new low cost assembly equipment
There are a lot of ways to go with this question. Price is the main reason to look at the ...

Best method to clean "no-clean" solder paste
We have found that cleaning a misprinted board is best done with a saponifier DI water cleaning that removes any ...

Cleaning solvent to replace Forane 141b?
There is no single alternative to 141b. Since each has its own performance characteristics, it is important to test the ...

HASL PCB's compared to OSP?
HASL process has the inability to consistently control the amount of solder coating applied to each pad and trace. The ...

Best way to Clean OSP Boards
A lot more people are using OSP coated assemblies, The misprinting has provided for a unique application for the chemical ...

Hand soldering skills
Good question. What you are looking for is an IPC Master Certification Center. These companies train and certify instructor and ...