Cross Drilled Rotors Poll

[xschop]

I am thinking about programming my CNC machine to cross-drill XS Rotors . I figure I gan get them done for about $40-45 each (I break/fry a tool on these tough rotors) with the standard pattern I used on my last set that took a long time to do on the incremental drill press. This lightens the rotors and increases stopping power and decreases heat/ brake fade....Let me know here if interested....chop

[webbcraft2150]

I be up for getting mine done!!! While your at it, figure out how to blanch grind em smooth again to.

[Da-Bubble]

I might be interested. Could it slot them too?

[fredintoon]

"I might be interested. Could it slot them too?"
A CNC mill should be able to slot rotors as well as drill them. I have seen vulgar pictures milled in rotors offered on e-bay, come to that.
Thing is, my XS11 has factory slotted disks and I have drilled my own XS650 disks tears ago. The Yamaha disk material is tougher than old boots BTW. Slow cutter speed & flood coolant works best for drilling & presumably for slotting as well.
And they are a bitch to re-surface, the rotor resurfacing lathes in brake shops make them look like a ploughed field.

[planedick]

Make 'wm smooth

I have had good luck grinding them in a lathe with a toolpost grinder setup.

[xschop]

Drill Pattern

This will be the Pattern and .25" hole sizes. On the rear rotor I added two opposing .5" holes for a wheel lock....

[ScottsXS]

i would be game!! keep an up date

[madmax-im]

Originally posted by fredintoon
"I might be interested. Could it slot them too?"
A CNC mill should be able to slot rotors as well as drill them. I have seen vulgar pictures milled in rotors offered on e-bay, come to that.
Thing is, my XS11 has factory slotted disks and I have drilled my own XS650 disks tears ago. The Yamaha disk material is tougher than old boots BTW. Slow cutter speed & flood coolant works best for drilling & presumably for slotting as well.
And they are a bitch to re-surface, the rotor resurfacing lathes in brake shops make them look like a ploughed field.

My '81 XS1100SH has extra slots on the rotors look closely

[Pat Kelly]

I drilled my own rotors with a bench-top Craftsman drillpress. Used one small bit for pilot holes and larger bit for final holes. Used plenty of cutting oil and good quality bits and had no problems. All 3 rotors took about an hour to drill.



You can see the holes get progressively larger from inner to outter. All holes are chamfered and all holes overlap around the diameter.

[mro]

Sorry chop...could not resist

Holey Rotors Pat....
Na...Na...Na.Na..Na
Mine be Holeyer than tho's Pat



mro

[81xsproject]

Personally, I would want more or bigger holes. However, I decided that I would just suck it up and hold out to spend the big bones for the EBC floaters.

[Dennyz]

A show your drilled rotors thread!

They really improve braking in the rain.

[Ken Talbot]

I got my inspiration for drilled rotors from Denny when I saw his bike at one of the PNW rallies at Sid's place. If you don't already have a cheap drill press and an expensive drill bit sharpener, this would be a pretty fair price for getting your rotors drilled. My only regret is I did not think of drilling graduated hole sizes when I did mine.