SOHC.co.uk Forums > CB350/400

Cross drilled discs

(1/9) > >>

allankelly1:
Hi all

Hope you are all well

Bike is off the road while I progress the rear disc conversion but wondered if anybody has ever cross drilled their discs?

I know the golden rules like the hole pattern most cover the whole disc face etc but does it make any different or is it just a style thing

As thinking if I am bored once the rear disc project is completed I may cross drill both the rear disc and the twin disc set up before spring time



Any thoughts

Best wishes Al


Sent from my iPhone using Tapatalk

taysidedragon:
Manufactured and modified drilled discs have a lot of different hole spacings and patterns.
I don't think it matters too much as long as you don't weaken the disc.

allankelly1:
Yes there are plenty of drill patterns on the web and as the discs are stainless they are less prone to cracking

Like I said. The pattern must cover the pad swept area and the hole only slightly bigger than the the disc thickness

Think it time to cad something up

Also when I did the rear disc conversion I bought a spare disc so got something to practice on as recon I will need to get some carbide drills due to the disc being stainless


Sent from my iPhone using Tapatalk

MrDavo:
As a student I used to regularly drop in to Sports Motorcycles in Manchester to lust at the bikes there.

I've never seen it reported, and the bike certainly doesn't have them now, but I saw with my own eyes that the original NCR Ducati that Mike Hailwood rode in his TT comeback had radially drilled discs, ie the holes went from the edge to the inside of the disc. They were beautifully done, with countersunk holes and done at an angle making an airscoop effect, no doubt saving unsprung weight as well as cooling. Proper 'works' bike stuff.

I've never seen this in any article or photo of that bike, and no doubt when they wore out or warped they got replaced with ordinary discs, I've seen the bike a couple of times and there is no sign. However I know what I saw, so just recording this for the reference of google and internet could be useful to someone. I wonder if the current owner knows?

allankelly1:


Lovely


Sent from my iPhone using Tapatalk

Navigation

[0] Message Index

[#] Next page