|
Sponsor
|
|
Eliminate Worry of Cross Contamination
While Models 529 and 1550 are similar semi-automatic cleaners with single wash and rinse tanks, the Model 2003 includes 2 wash tanks for cleaning multiple applications in one machine.
Smart Sonic
|
|
|
Sponsor
|
|
Start Micro Dispensing Today
The DL Micro Valve is specifically designed for dispensing micro volumes of material in precise, repeatable patterns. Learn more about the DL Micro Valve.
DL Technology
|
|
| Ask the Experts |
|
QUESTIONS
SUBMIT
MEMBERS
JOIN
|
April 30, 2007 - Updated
July 4, 2007 - Originally Posted
Through-hole ratios for PCB's
In Through Hole technology, what is the best lead to hole ratio to be maintained? Is the lead to hole ratio the same for any kind of PCB finishes or does it vary? What should be the pad size on the primary side and secondary side?
M.K.
|
| Expert Panel Responses |
We ran some recent tests and reported at APEX 06 "Lead Free Intrusive Reflow" by Coleman and Oxx. In this study 1:1.3 and 1:1.4 provided good results while greater than 1:1.5 gave voids or insufficient fill. I don't have information on Wave Solder process.
Bill Coleman
Vice President Technology, Photo Stencil
For over 18 years, Dr. Coleman has been the vice president of technology for Photo Stencil, working closely with customers to understand their printing requirements. His efforts have resulted in several new stencil products.
|
|
|
Free Newsletter Subscription
Circuitnet is built for professionals who bear the responsibility of looking ahead, imagining the future, and preparing for it.
Insert Your Email Address
|
|
Sponsor
|
|
Your Domestic PCB Solution
Summit helps you avoid long lead times and added costs—protecting your supply chain without compromise, while delivering the speed and quality you count on.
Summit Interconnect
|
|
|
