EMS Partners Use Thermal Profiles to Improve Quality, Costs

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Jacob
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Re: Getting back to basics
Jacob   3/3/2014 11:29:05 PM
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"Or a chain is only as strong as it's weakest link."

Eldredge, it's like the quality of a product depends up on the least quality of the components.

Eldredge
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Re: PLC controlled pcb soldering machines
Eldredge   2/27/2014 8:59:45 PM
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@Michael Allen - Exactly right - the temperature settings are only part of the puzzle. Different thermal masses will absorb and/or distribute heat differently. Sometimes there is a transition (loading) effect with the leading edge of product as it enters the different temperature zones. It is important to understand the thermal trnasitions that the workpiece experiences, which may be drastically different from the thermal transitions that the thermocouple for the heat controller experiences.

Eldredge
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Re: Getting back to basics
Eldredge   2/27/2014 8:52:30 PM
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Or a chain is only as strong as it's weakest link.

Jacob
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Re: Getting back to basics
Jacob   2/20/2014 11:08:57 PM
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"it makes total sense...I had just never really thought about the complexity of the testing. this has been a very useful conversation."

Hailey, one of the merits of community/social media discussion

Jacob
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Re: PLC controlled pcb soldering machines
Jacob   2/19/2014 11:22:56 PM
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"You may need to slow the down the conveyor or increase temperature in a specific zone. Adjusting the PLC program for each board design takes care of these board to board variations."

Michael, I think in PLC controlled system, adjusting the temperature for a while in running condition may be difficult.

Hailey Lynne McKeefry
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Re: Getting back to basics
Hailey Lynne McKeefry   2/19/2014 11:11:11 PM
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@Jacob, it makes total sense...I had just never really thought about the complexity of the testing. this has been a very useful conversation.

Michael Allen
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Re: PLC controlled pcb soldering machines
Michael Allen   2/19/2014 9:46:47 PM
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@Jacob, Yes, PLC-controlled soldering machines are programmed to achieve specific temperatures and timing. But the only way to be sure that the actual PCB is reaching those temperatures is to measure it. Two different boards going through solder using the same PLC "recipe" may result in very different temperature profiles. Or a section of a board with heavy copper might reach the correct temperatureeven though the rest of the board has. You may need to slow the down the conveyor or increase temperature in a specific zone. Adjusting the PLC program for each board design takes care of these board to board variations.

Jacob
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Re: Getting back to basics
Jacob   2/14/2014 4:33:00 AM
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"It dovetails with another conversation i was having today about how a poor quality or reliablity part can take down a much more expensive larger whole. it's a good reminder that it's teh worth of the worth of the system, not the worth of the individual part, that needs to be considered when counting the cost of a problem or defect that might be created."

Hailey, in quality analysis there is a saying 'quality of the product/device is measured on the least quality of its components'.

Jacob
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Re: Getting back to basics
Jacob   2/14/2014 4:29:52 AM
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"Yes, heat is the enemy of components but applying just the right amount of heat at the right time can greatly improve the robustness of a process."

Michael, you are right, especially in PTH (Pole Through Holes)PCB board, where wire jumpers are using.

Hailey Lynne McKeefry
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Re: Other thermal profiling applications
Hailey Lynne McKeefry   2/14/2014 12:36:26 AM
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@Eldredge, thanks for the detail...having a real-world example is really helpful.

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