Disc drilling pattern, thoughts.

[Oddjob]

Fancied a drilled and slotted pair of discs for my 500 but can't find someone to do it. So after looking around I found someone who will do both discs for £58 approx and for another £10 will match a pic of another pattern if you find one he doesn't do.

So I spotted this pattern on ebay for cast discs and thought it looked ok. What do you think? Sent it to the fella who's doing the job and he reckoned he'd need another box of 5mm holes 

[Johnwebley]

Do you want to lighten them,or improve braking in the wet and dry?

My thought are there are to many holes,

It will reduce the friction area of pad/disc,

Could increase the lever pressure needed to stop,


I would also slot the outer holes, so in the wet the water will centrifuge out



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[Oddjob]

Wet weather improvement John.

Still plenty of metal left for pad contact I'd have thought John, plus I'm adding a second disc so there should be a big improvement over the standard one.

Not a great lover of drillings which have just a few holes and getting stainless discs slotted isn't easy to source, been looking for a while now. Thought I'd found someone until I mentioned they were stainless and they said no.

[Sesman]

Ahem….

I have no idea if this is wrong or right…but it works.

As for weight saving…forget it. It just doesn’t make a meaningful performance difference.

[Sesman]

Incidentally all those holes where drilled using a single 5mm drill. And no, they are not countersunk. I’’ll try to get the drill details.

[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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[Sesman]

My pattern is better than yours so there.🥲

How’s it hanging Roo. Any closer to a fix or taking a break?

[Laverdaroo]

Nah, can’t be…….

I used reference points drawn on a roll of masking tape to get the correct radius and be able to replicate it easily. Just strip off tape until you get the curve where you want it,  pair of compass’s a fat coffee and Planet Rock on the radio and  yer away.

Can’t physically do much this week after treatment number 1 for a full removal of my teeth which is coming up  it’s been nil by mouth as I’m in so much pain! Had to halt proceedings  a bit and hoping to get back on it at the weekend.
Still out here in the Shed of  Dreams tidying for summut to do as I can’t sit still but not feeling like concentrating on anything cos I’ll probs bugger it up or forget something!

Never had tooth, head and jaw ache this bad in my life, if I had a gun I’d have bloody shot me self

Cams in, chain on just the sprocket to bob on and then try to run with the kickstart to ascertain what’s going down with the idler gear. I want to see if it’s spinning when the motor is running. If it is then it’s surgery time, if it isn’t, the bloody thing’s off back together as I reckon the starter motor issue is sorted.

Got my dates today for impending Les Dawson impressions of the 28tj April but have to have another 5 tungsten pegs putin first to hold the other metal work they want to put I when I surgery for the removal.

God, I’m not looking forward to this!
Mine are better, so nuuuur!


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[Sesman]

Hang in there Roo. It will all be worth it in the end.

[Sesman]

And at least for short while you will be the king ‘gurner’.

[Laverdaroo]

See you next Tuesday !!!

But you get my drift? Bet you were chuckling into yer malt looking for that?

Never been so petrified of anything in my life tbh, proper sh$%ing my pants!

Knowing my luck, I’ll be able to scratch me forehead with me chin!


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