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Author Material for a motocross bike disc brake?
Tiger
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Registered: 12th Jun 01
Location: Nuneaton Drives:Audi A4 2.0TDi
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5th Jan 15 at 15:41   View User's Profile U2U Member Reply With Quote

I'm making a few disc brakes for my mx bike as it's cheaper than buying them and I can tailor the design slightly to suit.

What's a good characteristic of a brake disc, material, grade, surface area etc.

The discs will never get very hot as the brakes are mostly wet or the bike is never stopping from high speed. I don't want a material that will degrade the pads too quickly.

Cheers.

[Edited on 05-01-2015 by Tiger]
taylorboosh
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Registered: 3rd Apr 07
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5th Jan 15 at 15:50   View User's Profile U2U Member Reply With Quote

Copper mate
taylorboosh
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Registered: 3rd Apr 07
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5th Jan 15 at 15:50   View User's Profile U2U Member Reply With Quote

Or lead
DaveyLC
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Registered: 8th Oct 08
Location: Berkshire
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5th Jan 15 at 16:01   View User's Profile U2U Member Reply With Quote

Surely its cheaper to buy discs? Discs are cast iron so they are very hard, anything that is going to be of a comparable hardness is going to be VERY difficult to work with.
Tiger
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Registered: 12th Jun 01
Location: Nuneaton Drives:Audi A4 2.0TDi
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5th Jan 15 at 16:06   View User's Profile U2U Member Reply With Quote

The ones I've bought recently are stainless steel.

I can make them for free so that's pretty cheap.
DaveyLC
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Registered: 8th Oct 08
Location: Berkshire
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5th Jan 15 at 16:07   View User's Profile U2U Member Reply With Quote

You must have a pretty sick lathe/mill/cnc machine?
Tiger
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Registered: 12th Jun 01
Location: Nuneaton Drives:Audi A4 2.0TDi
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5th Jan 15 at 16:35   View User's Profile U2U Member Reply With Quote

0.5m laser cutter.
GB123
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Registered: 21st Nov 11
Location: Gillingham, Kent
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5th Jan 15 at 16:40   View Garage View User's Profile U2U Member Reply With Quote

Asbestos
micra_pete
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Registered: 23rd Apr 03
Location: West Yorkshire
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5th Jan 15 at 17:15   View Garage View User's Profile U2U Member Reply With Quote

quote:
Originally posted by Tiger
0.5m laser cutter.




DaveyLC
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Registered: 8th Oct 08
Location: Berkshire
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5th Jan 15 at 17:16   View User's Profile U2U Member Reply With Quote

I certainly got told..
alan-g-w
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Registered: 9th Nov 07
Location: Glasgow
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5th Jan 15 at 18:24   View User's Profile U2U Member Reply With Quote

quote:
Originally posted by DaveyLC
Surely its cheaper to buy discs? Discs are cast iron so they are very hard, anything that is going to be of a comparable hardness is going to be VERY difficult to work with.


Cast iron is actually really easy to machine Davey. If you're not taking too heavy a cut its actually self lubricating as well.

Are you going to face them after cutting them out tiger...?
Corsa_Sport21
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Registered: 13th Apr 08
Location: Leven, Fife. Drives : 205 GTi
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5th Jan 15 at 18:28   View User's Profile U2U Member Reply With Quote

Make them from wood.

Works for EBC brake products.
taylorboosh
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Registered: 3rd Apr 07
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5th Jan 15 at 18:37   View User's Profile U2U Member Reply With Quote

quote:
Originally posted by Corsa_Sport21
Make them from wood.

Works for EBC brake products.



And jeds v6 manifold flanges
Tiger
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Registered: 12th Jun 01
Location: Nuneaton Drives:Audi A4 2.0TDi
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5th Jan 15 at 18:38   View User's Profile U2U Member Reply With Quote

quote:
Originally posted by micra_pete
quote:
Originally posted by Tiger
0.5m laser cutter.







Calm down just trying to put some scale to the equipment available!
GB123
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Registered: 21st Nov 11
Location: Gillingham, Kent
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5th Jan 15 at 19:52   View Garage View User's Profile U2U Member Reply With Quote

quote:
Originally posted by taylorboosh
quote:
Originally posted by Corsa_Sport21
Make them from wood.

Works for EBC brake products.



And jeds v6 manifold flanges


Not sure MDF is technically wood
taylorboosh
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Registered: 3rd Apr 07
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5th Jan 15 at 19:54   View User's Profile U2U Member Reply With Quote

True dat
johnny86
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Registered: 15th Feb 10
Location: in a bus stop.
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5th Jan 15 at 20:18   View Garage View User's Profile U2U Member Reply With Quote

Can't you make other brake discs and sell them on.
--ToM--
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Registered: 23rd Nov 07
Location: Wirral
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5th Jan 15 at 20:28   View User's Profile U2U Member Reply With Quote

Surely there would have to be some kind of product testing it would have to pass to be sold to public with it being brakes ?
John
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Registered: 30th Jun 03
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5th Jan 15 at 20:28   View User's Profile U2U Member Reply With Quote

quote:
Originally posted by johnny86
Can't you make other brake discs and sell them on.


Like a company who makes brake discs?
taylorboosh
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Registered: 3rd Apr 07
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5th Jan 15 at 20:32   View User's Profile U2U Member Reply With Quote

This is pikey as fuck imo one thing not to fuck about with
johnny86
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5th Jan 15 at 20:40   View Garage View User's Profile U2U Member Reply With Quote

quote:
Originally posted by John
quote:
Originally posted by johnny86
Can't you make other brake discs and sell them on.


Like a company who makes brake discs?


What I mean was sell them cheaper than other companies
Russ
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Registered: 14th Mar 04
Location: Armchair
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5th Jan 15 at 21:21   View User's Profile U2U Member Reply With Quote

quote:
Originally posted by johnny86
quote:
Originally posted by John
quote:
Originally posted by johnny86
Can't you make other brake discs and sell them on.


Like a company who makes brake discs?


What I mean was sell them cheaper than other companies


i swear, this guy
Gary
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Registered: 22nd Nov 06
Location: West Yorkshire
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5th Jan 15 at 21:27   View Garage View User's Profile U2U Member Reply With Quote

Disks will be cut then heat treated then ground down flat I would have thought. Just buy some ffs.
ed
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Registered: 10th Sep 03
Location: Northampton Drives: Fiat 500/Porsche Boxster
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5th Jan 15 at 21:42   View User's Profile U2U Member Reply With Quote

What Gary said - we did it at uni and it was a pretty big job in terms of hours spent. They were a 2 axis mill job and then ground flat. The material used was some kind of cast iron plate (alloy I assume). Don't have many details on it than that.
Tiger
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Registered: 12th Jun 01
Location: Nuneaton Drives:Audi A4 2.0TDi
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5th Jan 15 at 23:13   View User's Profile U2U Member Reply With Quote

The ones I've bought I can easily replicate, I've got access to all the machinery I need to make the actual disc. But if I was going to do it, I'd want to do it better than what I can buy buck for buck.

Of course it's easier just to buy them but the challenge would be to make something is use.

The one I've bought is lasered from sheet steel, that much is obvious as I see lasered metal all day long. It's made from stainless steel, I don't know what grade though. I can spin them up to make sure they have no buckle in them.

This is more of a project, hence why I'm asking.


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