Disc material??

[latheboy]

I made a rear disc for my slingshot out of 304 S/S and its done about 800k ... i do use the rear brake a bit but im not always on it .. also i got sintered pads .. the short of the story is that the disc is fucked :(, already under size .. so my question is ,what is the best material to make disc from ??? i know theres guys out there that make disc can you help me out [?]

[Gix11]

Ben will tell you, he makes the buzz saw discs. Email Exben or wait for him to get to this topic.

[TurboKat]

Bizalloy is what most aftermarket disc manufacturers use.

[crazymofo]

spot on TK ive made some nascar discs from bizally, at work.

not cheap tho, try checking with dave from aussiedisc's he is in the links/parts directory on this site methinks.


cheers.joe.

[megareg]

We use shitloads of the stuff here at work, used for wear plates in feed chutes etc. also good for brake discs too! live and learn... I think I will check out our workshop tomorrow!!

[latheboy]

Bizalloy it is then ... thanks everyone

[crazymofo]

reg... plz tell me you have some er.. offcuts laying round.. 6mm thick, and min of 330x390 (2 off) and one thats 250x320

if so.. how much?

cheers.joe.

[Zed14]

yours arent round like everybody elses then joe?

[crazymofo]

haha nah rexie, i need the extra 70 mm on one side so i can clamp the material in the laser's bed clamps :P

acutall rotor size is 310mm.. the rest is scrap tho i'll make use of the rest ;)

cheers.joe.

[megareg]

Joe, the stuff we use is about 20mm or so thick, BUT, I will ask the Mechanical Supervisor (Gary) about thinner stuff... Gary and I get on rather well!.... I wonder if Qantas will bitch about my "heavy" hand luggage... lol...
Cheers
Reg.

[megareg]

More info Joe, we have some 12.7mm stuff here (1/2" in fred flintstone measurement system), what grade do you need, 200 or 500? also, be aware that it work hardens... even with machining.

Cheers
Reg.

[crazymofo]

12.7mm.. fark! thats way to thick for me unfortunatley :( id need to machine down at least 6mm of it in order for them to work as disc's :(

and yep am fully aware of its hardness after work.. had to attempt to drill a hole into a plate once we had already cut it.. didnt happen lol.

thanks for the efforts anyways reg, much appreciated

cheers.joe.

[megareg]

No worries Joe. Oh, did you use those fancy cobalt drills???
Cheers
Reg.

quote:Originally posted by Gix11

Ben will tell you, he makes the buzz saw discs. Email Exben or wait for him to get to this topic.


Yeah, he's damned good at it too

I've only been waiting 4-5 months for a response to my 2nd query about some buzz saws (hint hint Ben)

(must admit that he did a good job on my handle bar extensions and even delivered them to me personally, on the fool's run, and the welder didn't even have to try and keep them straight while welding, they fitted that snugly)

[suxukifreak]

I can get Bis 80, 360 and 500 in offcuts in 6mm if you want to pick up from my place. We have plazma cutters i can use to cut out a disk but the cut isnt as clean as lazer.

[RussVC]

G'day,
This is my first post, I work in a iron foundry and years ago made a pair of front discs for a friends 0W01 superbike out of compacted graphite iron to replace his worn out ISR rotors, we have a spectrometer at work and tested some yamaha rd discs and found they were nade out of 420 grade stainless steel, hope this helps.
Cheers

[Gix11]

Hi Russ. Welcome aboard mate.

[latheboy]

Hey russ how goes it ....
id love some 360 SUX but its abit fair for me to travel .. EXBEN got back to me the next day with the info .. he must not like you CHALKY ... haha ...

[crazymofo]

des, you have mail.

cheers.joe.

[suxukifreak]

Crazy, you have mail.

quote:Originally posted by latheboy

Hey russ how goes it ....
id love some 360 SUX but its abit fair for me to travel .. EXBEN got back to me the next day with the info .. he must not like you CHALKY ... haha ...


That's only because he's met me.

[8D]

[latheboy]

http://www.streetfighters.com.au/forum/upload/80580599671411.jpg
I just took this baby off the surface grinder .. Its 360 Bizalloy .. took me about 1/2 an hour to draw on the puter got it from the laser cutters yesterday then grind it flat ... just need to counter bore the mount holes and BAMM i got a new disc ..

[latheboy]

Oh Yeah ... And thanks for the help with material guys .. :):)

[Gix11]

Farkin' 'ell. Nice work Latheboy!

[suxukifreak]

Doesn't Bis 360 rust easy?

[latheboy]

Thanks Gix ... Its the same material as the front and they are a year old with no rust .. and it has got wet .. and to be honest it cost me $40 so i dont care ill just make another [8]:D

Is that a fixed or floating disc Latherboy?

[crazymofo]

biz 360.. has a lower heat rating , it changes its chemical composition under heat, at around 350 deg i think. dont really think it'll be that much of an issue on the rear, but the fronts when at the track id be less trusting.

biz80 has 550ish deg rating, prolly a better bet, its what i'm going to use, and is acutually recomended by the aviation board to be used as a replacement steel for brakes on aircraft (thinking about it.. planes have a lot of weight, and speed, trying to pull up,,, high heat)

cheers.joe.

[latheboy]

Crazymofo ... Couldnt you have told me that 3 days ago !!! nah its all good ... ive never done a track day so im not too worried about it for now ... the disc is fixed Chalk once i get around to getting a new swingarm ill go all out with a cool floater disc ..
I got the front disc's from Awesome Disc in ringwood and im pretty sure he said they were 360 ..
TITS

[crazymofo]

mate, i dont think it would matter all that much on the road anyways... disc's never heat up enough, even when punting hard on the road, as the braking force varies a lot.. slight dab here, there, big grab here. another dab there...etc....

however on the track.. constant and repetitive hard late braking, the disc's will have a lot more abuse thrown at em.

cheers.joe.