Drilling a brake disc carrier? - SV650.org

17-03-12, 04:53 PM

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

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?

17-03-12, 06:15 PM

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

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.

17-03-12, 06:40 PM

Quote:

Originally Posted by Sid Squid

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

Quote:

Originally Posted by specialone

Oh good, I had understood then

I thought so - I realised you were just making certain of the question.

Quote:

Originally Posted by specialone

Does he realise that this is a precision job?

I hope so.

yorkie_chris · 17-03-12, 06:54 PM

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.

17-03-12, 08:05 PM

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

Don't bother answering the questions - just guess.

17-03-12, 09:23 PM

is there a keithd option for this guess?

17-03-12, 04:53 PM	#1
BBadger Guest Posts: n/a	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

17-03-12, 06:05 PM	#2
Sid Squid No, I don't lend tools. Mega Poster Join Date: Jul 2003 Location: Skunk Works, Nth London Posts: 8,680	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? __________________ If an SV650 has a flat tyre in the forest and no-one is there to blow it up, how long will it be 'til someone posts that the reg/rec is duff and the world will end unless a CBR unit is fitted? A little bit of knowledge = a dangerous thing. "a deathless anthem of nuclear-strength romantic angst"

17-03-12, 06:15 PM	#3
Specialone Guest Posts: n/a	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.

17-03-12, 06:34 PM	#4
Sid Squid No, I don't lend tools. Mega Poster Join Date: Jul 2003 Location: Skunk Works, Nth London Posts: 8,680	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. __________________ If an SV650 has a flat tyre in the forest and no-one is there to blow it up, how long will it be 'til someone posts that the reg/rec is duff and the world will end unless a CBR unit is fitted? A little bit of knowledge = a dangerous thing. "a deathless anthem of nuclear-strength romantic angst" Last edited by Sid Squid; 17-03-12 at 06:35 PM. Reason: Spelling (bad).

17-03-12, 06:54 PM	#7
yorkie_chris Noisy Git Mega Poster Join Date: Apr 2007 Location: Halifax/Leeds Posts: 26,645	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. __________________ Currently Ex Biker Now rebuilding a 63' fishing trawler as a dive boat

17-03-12, 08:05 PM	#8
BBadger Guest Posts: n/a	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

17-03-12, 08:52 PM	#9
Sid Squid No, I don't lend tools. Mega Poster Join Date: Jul 2003 Location: Skunk Works, Nth London Posts: 8,680	Re: Drilling a brake disc carrier? Don't bother answering the questions - just guess. __________________ If an SV650 has a flat tyre in the forest and no-one is there to blow it up, how long will it be 'til someone posts that the reg/rec is duff and the world will end unless a CBR unit is fitted? A little bit of knowledge = a dangerous thing. "a deathless anthem of nuclear-strength romantic angst"

17-03-12, 09:23 PM	#10
BBadger Guest Posts: n/a	Re: Drilling a brake disc carrier? is there a keithd option for this guess?

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
rear brake disc	Gene genie	Stuff Wanted	1	04-04-10 11:12 AM
Brake disc	jack930	Stuff Wanted	2	13-10-09 10:00 AM
Disc loose on carrier	Fizzy Fish	Bikes - Talk & Issues	6	13-08-07 01:18 PM
Hammeriting the rear disc carrier?	svrash	Bikes - Talk & Issues	18	16-05-06 02:15 PM