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tetrabiodistributed / papra-pcba

Printed Circuit Board Assembly (PCBA) for the PAPPRa m12 controller
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Resolve the exact model of fan #21

Closed darraghbr closed 3 years ago

darraghbr commented 3 years ago

After chatting with Darryl it seems there is a mismatch between the fans that are specced and the standard fans that are the same form factor.

With some napkin mathematics I do not believe that the fan that has been specced (from amazon) is delivering the flow rates and pressures that are quoted, as ultimately it is drawing the same wattage but is somehow delivering significantly higher performance than other standard fans.

darraghbr commented 3 years ago

If we purchase a standard model like this one:

https://www.digikey.co.uk/product-detail/en/nmb-technologies-corporation/BG1203-B045-000-00/BG1203-B045-000-00-ND/4504979

Then do some comparative tests between the fan acquired from amazon.

mmroden commented 3 years ago

Testing involves a multimeter to measure current draw, to make sure that they blow the same amount of air. Checking to see if the flow is about the same (for some given value of "the same")

darraghbr commented 3 years ago

Updated my comment with the correct model of fan.

mechatroniks-git commented 3 years ago

Tested the following blowers:

The Sunon Fan was found to be as quiet and a bit more powerful than the Amazon one.

mmroden commented 3 years ago

We will go with Sunon. This will increase the BOM by $10 per individual part to $25/fan. The amazon one can be recommended as an alternate source item for lower cost.