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Board Talk
At Board Talk, the Assembly Brothers cut through the marketing hype, the platitudes and incompetent un-scientific baloney with a search for the truth.
This episode features:
Phil Zarrow, ITM ConsultingPhil has been involved with hybrid and PCB assembly for more than 30 years including equipment design for pcb fab and assembly. 
Jim Hall, ITM ConsultingJim has a wealth of knowledge in soldering and thermal technology, equipment and process basics and is a pioneer in the science of reflow technology. |
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Comments and Questions Nice session on TC attachment. It took me a couple seconds to realize that you were saying BOARD talk, not BORED talk, but that is just the effect of the cold New England weather. We sometime forget that new folks don't know the basics or older folks (including me) begin taking shortcuts that get us into trouble. Kapton tape at the TC tip is one of those easy to do short cuts. The high temp solder (usually hi lead 90/10) and thermal epoxies (good to 290 for short times) are good ways to attach the TC's. But they usually require that we sacrifice a board, and it takes some effort to prepare. I agree with the KIC guys that the aluminum tape with Kapton tape as a strain relief is great method. It is quick, non-permanent, and holds the tip of the TC in intimate contact with the joint. Fred Dimock Manager, Process Technology BTU International We have medium volume and high mix and we are using tape too with good results. S.H. The Rochester Institute of Technology just conducted a study on TC attachment. Phil and Jim you were dead on. I was kind of surprised high temp solder tested so poorly. Interesting how slow it is to respond in the all important peak zone of your profile. The study also showed aluminum tape with the best results. See: Thermocouple Attachment Results are in! Brian O'Leary, KIC Hello Phil and Jim, Good to see your piece on connecting thermocouples. In our everyday life we see still a lot of customers struggeling with this and then not measuring the real temperatures they need to measure. Keep going strong. Marc Dalderup Rehm Thermal Systems Germany Hey guys, nicely done. I like the car-talk like format, it is fun. Mike Limberg and I just got done writing a book on profiling, we used the dummies like format and had a lot of fun with it. We have a whole section on TC attachment. We are a big fan of conductive Aluminum tape, used along with Kapton for strain relief like you mention in your podcast. We talk about high temp solder and epoxy which can work also, but like you said you got to be careful of mass. Lot of times we see unequal amounts applied per TC that can throw your readings. What is your take on aluminum tape, realizing of course it is a non permanent solution? Brian O'Leary KIC Below is a link to a site with we send our customers to with respect to TC attachment. We have found that alumimum tape is a fast secure way to attach TC's. Many of our customers are High Mix Low Volume and can not scrap a board, they must ship all the bare baords they receive. http://profilingguru.com/ Good stuff.... Michael Limberg KIC |
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