Electronics Forum | Mon May 23 08:22:31 EDT 2005 | davef
Thermal mass is the ability of a material to absorb heat energy. * A lot of heat energy is required to change the temperature of high density areas, like a ground plane. They are therefore said to have high thermal mass. * Light weight areas, such as
Electronics Forum | Wed Oct 24 10:48:47 EDT 2007 | slthomas
Actually I didn't see anything saying this person was an engineer, but I digress.... In this case this person may very well be referring to the delta t across space rather than over time, as in different locations on a pcb that's being profiled.
Electronics Forum | Wed Oct 24 13:27:13 EDT 2007 | hussman
Ah, see Steve, I was right. It depends Marcin. If you use the same temps in each zone for all your product, vary you converyor speed. This will negate any waiting time between profiles. Slowing the speed will decrease your Delta-T to an acceptabl
Electronics Forum | Thu Oct 25 13:53:35 EDT 2007 | mpolak
Thanks for all your answers. Could you guys tell me how you profile new job. I mean if you could how do you begin setting up profile for brand new job and so on. It would be very usefull for me. Thanks MArcin
Electronics Forum | Fri Oct 26 10:01:47 EDT 2007 | chineechooze
Marcin SMTnet will no acommodate me to attach a file on email please provide me with you full email adress.
Electronics Forum | Fri Jul 31 19:14:58 EDT 2020 | emeto
Interesting one. I your machine placement algorithm capable to catch missing ball on the BGA while placing? Second question will be about component itself - datasheet will probably help. BGA body amterial? BGA balls alloy? BGA pad material before bal
Electronics Forum | Fri Jul 31 19:43:43 EDT 2020 | rsatmech
Yes our M/C is having the capability. I will also double check it is enabled in this component. PCB - OSP finish. I will check the component data sheet for your other questions. Thanks for the response.
Electronics Forum | Fri May 27 17:21:35 EDT 2005 | mrclean
Dear SM Rookies, Another acceptable test method is visual inspection. IPC-A-610 details what to look for with different contaminants, providing magnified pictures of the possible visual residues. With an existing cleaning process, magnification
Electronics Forum | Wed May 05 17:18:38 EDT 2004 | davef
It's a Furukawa proprietary material. 'Google' on just the 'EFTEC 64T'. [Sometimes it's Cu EFTEC 64T, copper EFTEC 64T, sometimes just EFTEC 64T.] For instance, Table 5-2 in: http://developer.intel.com/design/packtech/ch_05.pdf
Electronics Forum | Wed Oct 24 12:18:33 EDT 2007 | mpolak
I was asking about delta t in profiling, because I have just started to learn how to do it and wanted to know about it. So how can you reduce delta t, so you dont go from cold to hot too fats. Is it enough to slow donw conveyor speed??? Thanks M
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