Electronics Forum: pcb and warp (Page 1 of 72)

warp and twist

Electronics Forum | Mon Feb 13 23:05:02 EST 2017 | swestheimer

I have been asked a very good question but have not been able to find a good answer. IPC for both PCB and PCBA refer to the X & Y dimensions to measure warp and twist but how would you determine the warp and twist for a round PCB or PCBA?

warp and twist

Electronics Forum | Tue Feb 14 22:20:10 EST 2017 | swestheimer

Hi Dave, Thank you for your inputs as they were good suggestions. I however let out one important detail and that this is IMS material and not glass reinforced so I think that there is more bending going on during processing than warping and twistin

warp and twist

Electronics Forum | Tue Feb 14 09:10:43 EST 2017 | davef

Assuming the traces run parallel and perpendicular to each other, I'd choose one direction the traces run as "x" and the other direction for "y." Then I'd pick a unique identifier on the board to insure proper orientation. Next, I'd measure warp and

DoE on post-reflow PCB - warp

Electronics Forum | Mon Jul 01 02:42:32 EDT 2002 | ianchan

Daan: thanks for the tip.

DoE on post-reflow PCB - warp

Electronics Forum | Mon Jul 01 13:08:21 EDT 2002 | peterson

What is Tg?

DoE on post-reflow PCB - warp

Electronics Forum | Mon Jul 01 18:30:58 EDT 2002 | mcox

Remember! Empirical data will allow you to take advantage of the inherent continuity of quantitative variables.

DoE on post-reflow PCB - warp

Electronics Forum | Tue Jun 25 01:01:15 EDT 2002 | ianchan

Hi mates, has anyone ever done a DoE on the degree of warp PCB, after a SMT Reflow process? what were the findings and conclusion based on such a DoE? which were the critical (DoE) factors that influence the degree of warp PCB? any optimal reflow se

DoE on post-reflow PCB - warp

Electronics Forum | Mon Jul 01 17:22:27 EDT 2002 | Daan Terstegge

Tg = glass transition temperature, the temperature at which the glass-epoxy starts losing it's properties as a solid material. daan

DoE on post-reflow PCB - warp

Electronics Forum | Wed Jun 26 21:05:15 EDT 2002 | ianchan

Hi Dave F, customer calls it "warp", we can call it "twist/bow"..etc. the "warp" occurs on individual PCB cells of 28per each panel. the overall dimension of the panel is 139mm x 168mm, and each individual PCB cell is 2.4mm x 1.2mm. Thickness is 0.

DoE on post-reflow PCB - warp

Electronics Forum | Wed Jun 26 08:53:32 EDT 2002 | davef

We have not done a DOE on board warping. Consider: * How close the board gets to its Tg during the reflow cycle * Amount of copper on each side and the balance between the two * Thickness of the board * Overall length x width * Time at temperature

  1 2 3 4 5 6 7 8 9 10 Next

pcb and warp searches for Companies, Equipment, Machines, Suppliers & Information

Precision PCB Services, Inc
Precision PCB Services, Inc

Products, services, training & consulting for the assembly, rework & repair of electronic assemblies. BGA process experts. Manufacturers Rep, Distributor & Service Provider for Seamark/Zhuomao and Shuttle Star BGA Rework Stations.

Training Provider / Manufacturer's Representative / Equipment Dealer / Broker / Auctions / Consultant / Service Provider

1750 Mitchell Ave.
Oroville, CA USA

Phone: (888) 406-2830

Pillarhouse USA for handload Selective Soldering Needs

Training online, at your facility, or at one of our worldwide training centers"
ISVI High Resolution Fast Speed Industrial Cameras

High Resolution Fast Speed Industrial Cameras.
SMT feeders

Have you found a solution to REDUCE DISPENSE REWORK? Your answer is here.
Global manufacturing solutions provider

Component Placement 101 Training Course
Professional technical team,good service, ready to ship- Various brands pick and place machine!

Private label coffee for your company - your logo & message on each bag!