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Originally posted by MadDogMe
I'd remove the 'heatspreader' from the P4 if I was you and make the cup array the same size (well slightly bigger  ) than the core. Are the ID of the holes to big?. It might make a good jet/spray when in the open air but what about under water/backpressure?...
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i realy dont want to remove the heat spreader but i have lapped it down to show the copper in the center.
i could try the smaller tube i have but they are not metric so when i use the 2mm tube they have a very snug fit into the 2mm holes but the smaller tube is a fraction to big for a 1.5mm drill bit.
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Impingment is the force with which the water strikes the metal is'nt it?. like washing a path with a hosepipe, if you put your finger over it, it rocks! . therefore maintaning the waterspeed/velocity is important, would'nt getting it out of the cup after it has hit the BP hard&fast be better?. With the flat bottom it'll create more turbulance and have a bigger surface area of 'thin BP' but won't that turbulance create backpressure?. I don't know which is best :shrug: ...
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from what little i know the impingment is like you said a jet of water hitting a flat surface.
RE the cup shapes i am trusting cathar and bigben2k who both said the same abput flat cups being best.
if the cup is round then the impingment area is smaller and most of the jet is just directed out of the cup.
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It's strange the chuck does'nt wobble with the drillbits. Does the endmill have a perfect round shaft, or does it have grooves cut into it?...
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the endmill has a thread at one end it could be that. I am going to take the piller drill back anyway when i was assembling it the shelf that can be moved broke while i was pushing down onto some wood to install the chuck. That could be why the chuck is wobbling to.
here is a pick of my latest attemp. the top looks good and you can see the 2mm holes aligned with the cups.
and here the cups. i think i have a problem making the first mark into the copper. as i am drilling into the plexi and then into the copper. I might try a 1mm or 1.5mm drill first to make the marks then drill with 2mm after in the top.
i used the end mill on this one so the cups are flat and very thin but as you can see they made a mess of some of the cup walls. Not sure if i will finish this one but it might be worth while to see how well the flat cups work.
on the thermaltake block i removed some of the fins as cathar sugested and made a smaller jet plate. did some tests yesterday and after made the jet hole a little bigger and will test again today.