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-   -   Drilling a brake disc carrier? (http://forums.sv650.org/showthread.php?t=176343)

BBadger 17-03-12 04:53 PM
Drilling a brake disc carrier?
 
To those of you who know your engineering know how and what not i have a question.

If i were to take a 4 bolt break disc (probably 300-320mm) turned 45degree and the bolt holes drilled a few mm further out but still on solid metal.

Would this compromise the disc and cause it to fail on me in some way?

Or if you think this a stupid idea does any one know of anywhere that i would be able to find a "blank disc", whole but without the bolt holes drilled?
or should i bite the bullet and get custom disc makers to make me one up.

Thanks
Badger

Sid Squid 17-03-12 06:05 PM
Re: Drilling a brake disc carrier?
 
What's the diameter of the centre hole, the width of the centre circle*, what size are the existing holes and what size will your new ones be, and how far from the edge?

*By which I mean if you were to take just the bit where the bolts go, what size is that circle - inner and outer?

Specialone 17-03-12 06:15 PM
Re: Drilling a brake disc carrier?
 
That would be incredibly difficult to do accurately, needs to go on a miller really so it can be done with precision.

Take a photo and overlay where you want the new holes so we can see, I'm struggling to see exactly what you want tbh.

Sid Squid 17-03-12 06:34 PM
Re: Drilling a brake disc carrier?
 
BBadger wants to use a disc which has it's mounting holes in a smaller PCD than the bolt holes in the wheel, to do this he wants to drill four new holes equidistant between the originals but on a slightly larger circle.

Specialone 17-03-12 06:40 PM
Re: Drilling a brake disc carrier?
 
Quote:
Originally Posted by Sid Squid (Post 2679299)
BBadger wants to use a disc which has it's mounting holes in a smaller PCD than the bolt holes in the wheel, to do this he wants to drill four new holes equidistant between the originals but on a slightly larger circle.
Oh good, I had understood then :)

Does he realise that this is a precision job?

Sid Squid 17-03-12 06:48 PM
Re: Drilling a brake disc carrier?
 
Quote:
Originally Posted by specialone (Post 2679302)
Oh good, I had understood then :)
I thought so - I realised you were just making certain of the question. :D
Quote:
Originally Posted by specialone (Post 2679302)
Does he realise that this is a precision job?
I hope so.

yorkie_chris 17-03-12 06:54 PM
Re: Drilling a brake disc carrier?
 
My gut feeling is try it and keep eye out for any signs of distortion provided the holes do not end up dangerously close to the outside of the carrier or any lightening holes in the carrier.

BBadger 17-03-12 08:05 PM
Re: Drilling a brake disc carrier?
 
yes this is the general idea and i have someone who can do the cnc work for me but its just a matter of do you think im wasting my time ..... could it cause structure issues if the holes get close to an edge?

or

just a flat 320mm made up from somewhere like This Lot

Sid Squid 17-03-12 08:52 PM
Re: Drilling a brake disc carrier?
 
Don't bother answering the questions - just guess.

BBadger 17-03-12 09:23 PM
Re: Drilling a brake disc carrier?
 
is there a keithd option for this guess?


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