Another Cree CXB3590 DIY thread

captainmorgan

captainmorgan

Well-Known Member
Found out my heatsinks were slightly concave so I need to flatten them before I mount the COB's,hope to start that tomorrow.

Since this will be my main thread for my next grow I thought I should post this here.

Got the test results today from my Chaos sample,wanted to know if there would be any difference between the sample I got from someone else that was HPS grown and my LED grown plant. Looks like almost all the levels were slightly higher and mine showed another terpene that didn't show in the HPS sample.
 

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captainmorgan

captainmorgan

Well-Known Member
I called Heatsinkusa about the flatness and I have to say they were great about talking to me. They use a industry standard for tolerance of flatness and for mine that was .014 thousandths,mine measured at .012 to .013 so they were within tolerance. They actually did a spot check of their stock and said most of it was .008. They told me that each profile is different for it's tolerance depending on the difficulty of extruding it and it can fluctuate even in the same run. It looked to me that this flattening by hand was going to be time consuming so I solved that with the purchase of a disc sannder. It looks like over kill but I got a 12" disc sander so that if I used a larger profile in the future it could handle it. Got it on sale for $120 and I think it was money well spent,took maybe 30 minutes to flatten 8' of 3.5" heatsink and that includes setting it up and putting it away. Now all I have to do is touch them up were the COB's go. I wasn't willing to tighten down such a large COB as the 3590 with that much of a concave surface,especially since I turned the holder so the screw holes fell in between the fins so that the corners of the COB pointed the the sides of the heatsink.

http://www.harborfreight.com/12-inch-direct-drive-bench-top-disc-sander-43468.html
 
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PurpleBuz

Well-Known Member
captainmorgan said:
I called Heatsinkusa about the flatness and I have to say they were great about talking to me. They use a industry standard for tolerance of flatness and for mine that was .014 thousandths,mine measured at .012 to .013 so they were within tolerance. They actually did a spot check of their stock and said most of it was .008. They told me that each profile is different for it's tolerance depending on the difficulty of extruding it and it can fluctuate even in the same run. It looked to me that this flattening by hand was going to be time consuming so I solved that with the purchase of a disc sannder. It looks like over kill but I got a 12" disc sander so that if I used a larger profile in the future it could handle it. Got it on sale for $120 and I think it was money well spent,took maybe 30 minutes to flatten 8' of 3.5" heatsink and that includes setting it up and putting it away. Now all I have to do is touch them up were the COB's go. I wasn't willing to tighten down such a large COB as the 3590 with that much of a concave surface,especially since I turned the holder so the screw holes fell in between the fins so that the corners of the COB pointed the the sides of the heatsink.

http://www.harborfreight.com/12-inch-direct-drive-bench-top-disc-sander-43468.html
Click to expand...
what grits did you use ?
 
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PurpleBuz

Well-Known Member
captainmorgan said:
It came with 120 so I just flattened with that but I'm trying to find something finer locally but I might have to order it,still a work in progress.
Click to expand...
gotcha. I picked up an orbital sander and a rubber block been wondering what grit I should start with and end with.
 
littlejacob

littlejacob

Well-Known Member
Lots of work to have it polished!
Me i just flattened the middle where the cob is.imo there is no need to touch the sides.
But of course a well polished(as a miror) h.s is a beautiful thing, but beware of the scratches...
C.U
 
Growmau5

Growmau5

Well-Known Member
I too have received several concaved heatsinks from heatsinkusa in the 5.886" profile. The concavity was more intense at the edges than in the center, I assumed it "cupped" due to heat from the cutting process. thanks for posting your conversation with them and your solution.
 
captainmorgan

captainmorgan

Well-Known Member
The cupping occurs during the extruding process,they basically shove a piece of aluminum through a form under great pressure and heat which has the profile of the heatsink,some profiles are easier than others to form.
 
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