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| general heat sink rules for fin dimensions |
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| coppercone2:
--- Quote from: duak on July 12, 2019, 04:19:39 pm ---Coppercone2, what type of milling machine are you using? For small end mills on the order of 1 mm you need a machine with tight ways and a fast spindle and have to watch the feed and speed carefully. If fed too fast or if the end mill loads up with chips it'll break like glass. Depending on the shape and spacing of the fins, it's probably better to use a slitting saw instead of an end mill. --- End quote --- just a little proxxon. tried milling a steel wrench, some coins and some plastic with it, seems to work OK |
| DBecker:
Almost all heatsink designs are driven by manufacturing cost. They aren't picking optimal shapes, they are figuring out how to efficiently make good-enough shapes. The optimal size and shape of fins/pins will be heavily influenced by the airflow and turbulence. You can over-optimize to where a tuned design is not going to work in all conditions. Long ago I had co-workers who had been on a exciting-but-uncomfortable airplane ride to diagnose their equipment failing at high altitude. A highly tuned cooling design at sea level pretty much failed when the Reynolds number changed. My experience with a high-power project taught me a few lessons. While an aluminum block with spring clips is very appealing, using even tiny copper heat spreaders under the devices dramatically improves the performance. And that a round bored hole transfers surprisingly little heat to fluid flowing through, no matter what the flow rate. BTW, are you planning to use an end mill on bulk copper? That will be... challenging. |
| coppercone2:
i was thinking tellurium copper |
| ahbushnell:
The problem with milling fins on heatsinks is the fins start to vibrate when they get long and skinny. |
| coppercone2:
I thought about that and I thought I might be able to fill them with wax or something in between cuts maybe hot glue, not sure what kind of strength you need |
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