Other Stuff > Misc / Open
Disc drilling pattern, thoughts.
K2-K6:
I feel those holes are fine as there's such a surplus of material on these disc.
Take the point John makes about slots taking water to the edge. Years ago we slotted quite a few, mostly rear on 750 F1 and Kawasaki as they came in, gave better initial response and clear grit from making score lines in disc. That was either with a bull nosed slot mill (U shape into disc face) to leave sharp edges to clean the pads. A friend still has his one on rear of F2 we did, three slots on each side. Can also use a roller mill with narrow "trench" cutter, again with rounded profile to make exactly the same U profile.
Slotting is still used on some motorsport applications, especially rally as it does keep the pads and surface from getting so influenced by gravel etc.
Can't see a problem with 5mm holes, much larger they "sizzle" as you lightly apply them, even then they work well.
Sesman:
‘Twas a cobalt drill, but from where I sourced it I can’t recall.
K2-K6:
My reply to Ken, we overlapped there when replying :)
Sesman:
👍😁
Laverdaroo:
I don’t mind a drilled disc and have done both the 400 and the 550, love it but I think that pattern is a bit busy TBH. I made my own patterns and applied directly and drilled them myself. Not that much of a hassle as so long as you’ve plenty of cutting fluid on it. It’s quite satisfying
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