Thank you so much djozz. This is a great effort. The only issue is that you misspelled “.” with “,” on your notes all the way.
Sorry can’t help myself. Just kidding.
I am actually quite surprised to see copper+dielectric is handling its own up till higher amps. I have a bunch of them from Aliexpress and am still thinking of the best method to punch through to copper layer. And then…
Seems to fit my style. How deep did you need to dig/punch? Got any pics?
The aluminum SinkPads turned out to perform well. Would ordinary aluminum MCPCBs perform the same when its dielectric will be removed just like the copper MCPCBs? :~
Seems to fit my style. How deep did you need to dig/punch? Got any pics?
Deeper than you would think. Those combined layers are thicker than I imagined. It may also be that I am compressing the underlying copper, but I try not to do that. Not sure if I have any lose ones around. If I do, gouge it and post a pic in the next day or two.
I have no idea how it performs. I'm guessing somewhere between the djoss' number 3 and 4 bases.
Thanks DJozz! Though I think you might have your #’s wrong in the first picture. IIRC, the one with the tc cutout in the dielectric layer is the SinkPad 2. Backed up by the fact that the XM-L2 is of course a newer LED than the XM-L, it would seem odd to me for the “newer” SinkPad 2 (that you have listed as 5) to ignore the XM-L2, while the “older” SinkPad 1 would have it listed on the layer. I’ll pull apart my SupFire M6 to check—I need to lap those puppies anyway.
EDIT: Not really necessary, if you zoom in on the photo, the one you have labeled as 4 has SinkPad II written on the bottom, but listed as SinkPad V1 in the key, and the one you have label as 5 has SinkPad written on the bottom, but is listed as SinkPad V2 in the key.
Yeah I’ve been asking myself that same question too. :~
So I think I’ll do the same thing to aluminum MCPCBs what I’ll be doing to my copper MCPCBs - drill a 2.5 mm hole at the dielectric area then fill the hole with copper from an AWG 10 wire which is about 2.58 mm thick. That should do the trick (I hope).
About the same. From our members’ tests, pretty sure we can establish now that the limiting factor is almost always the dielectric layer. Once that factor is taken out, even aluminium base gives performance not too far from Noctigon/Sinkpad.
There is a new MCPCB with a Diamond like dielectric structure. The dielectric functions like graphite which is used by high end fixtures manufacturers as a thermal pad, in that it spreads heat both vertically and horizontally and can provide performance of copper PCB, in a ALU PCB (cheaper)
Interesting results, thanks for the detailed tests.
I think where this is most valuable is in modifying those oddball size stars that Sinkpad and Noctigon don't have, 25mm in the Aleto 26650, 32mm in (I forget what). Maybe even triplet/quad boards?