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?...
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: ...
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?...