How to: Cross Drill Rotor w/ Patterns

[Ghetto]

Looks pretty sweet. I am slackin.

 

[thelowlife]

the rear wheel is smaller racerdave you are correct

What is the diameter of the rear and I'll do the patterns for the rear as well. I have a drum rear so I can't measure it up.

 

[kvanderploeg]

I don't have the rear pulled off, so I can't measure, but here is another one I found.

http://smg.photobucket.com/albums/v...w&current=RearBrakeDiscUniversal10mm-6Deg.jpg

He has the diameter listed as 267mm and the rotor face as 46mm.

Kent

 

[thelowlife]

Wow.. sorry I've been slacking a lot heres the rear pattern.

 

[BA_Dave]

Did you do anything about deburring the edges of the holes? I'd think a leftover bur or two would wreak havoc on your pads.

 

[kvanderploeg]

I just lightly touched each hole with a countersink bit.

Kent

 

[5twins]

The holes are best left sharp edged, they clean the pads better that way, so don't countersink them much, if any. I use a little deburring tool on any that need some attention. One more thing - hole size matters. One of the benefits of drilling your disc is the ability to create more surface area (sides of the holes) and achieve better cooling. This only happens if you use holes the same size or smaller than the thickness of the disc. Go larger than the disc is thick and you actually lose surface area which means less cooling.

 

[racerdave]

5twins, that's a good tip. From that info, just off the top of my head then, I'm thinking about a 5/16 hole for a oem rear disc?

 

[5twins]

The stock 650 discs are 7mm thick so 1/4" would be better. I run a 5mm thick SR500 disc on mine and drilled the holes 3/16".

 

[I am Carbon]

thelowlife,Thanks for the templates.

 

[h3llb3nt1]

I did an aggressive hole pattern. Started with an 1/8in then went up from there. Took a little longer but, I think it turned out great

 

[I am Carbon]

h3llb3nt1 ,Thats cool a hell! I didn't understand what You ment untill now That I see Your rotor!
I would have liked to have one like it.The next one I'll do that
Have You bent those locking tabs over yet?

 

[gggGary]

h3llb3nt1 ,
Have You bent those locking tabs over yet?

Probably no big deal unless he runs a brake line..........

 

[I am Carbon]

Probably no big deal unless he runs a brake line..........

 

[5twins]

Carbon, on your next rotor, I would add one more hole on the outer edge and delete the innermost one.

 

[h3llb3nt1]

h3llb3nt1 ,Thats cool a hell! I didn't understand what You ment untill now That I see Your rotor!
I would have liked to have one like it.The next one I'll do that
Have You bent those locking tabs over yet?

No not yet. I'm gettin there. when i get all the fab work and final cleaning done ill bend em over as i reassemble. Got the case split and degreased this weekend. Will get crank and cam off to hugh this week

 

[I am Carbon]

Carbon, on your next rotor, I would add one more hole on the outer edge and delete the innermost one.

10-4 I see what You mean. Thanks

 

[Royboy]

Used pretty much the same method. I used the depth gauge on my drill press to make the dimples.....

Untitled by Matt Francosky, on Flickr





p!nK

Question born of ignorance, did you dimple the backside as well?

roy

 

[h3llb3nt1]

Roy that looks really good. By having just the dimples drilled, will those fill up with brake pad residue or any road sediment?

 

[zmaxmotorsports]

Nice work guys,problem is they all look the same if everybody uses the same pattern!