Author Topic: disk brakes query (Read 9980 times)

orange · « **Reply #15 on:** January 15, 2008, 08:45:08 am »

I think others are better placed to answer on the aluminium front, I just know mine is made of that, but not what type etc.

Re. hose adaptors I just use the cable ties $:-\$

kiwi · « **Reply #16 on:** January 15, 2008, 01:08:25 pm »

terry(shovelon) is prolly your man for material spec...aluminium places wil often hve an "ofcuts bin"Callum may also have some input on material

shovelon · « **Reply #17 on:** January 15, 2008, 06:15:47 pm »

6 mm would work fine. 6061 is really good stuff, and most common too.

If it is me, I would opt for 2 or 3 mm 4130, and slip bewteen the dropout and hub. But 4130 is not as easy to fab as alum.

Terry

kiwi · « **Reply #18 on:** January 16, 2008, 01:41:58 am »

4130 being a stainless steel?

jeffhop · « **Reply #19 on:** January 16, 2008, 10:30:37 am »

isnt 4130 chromoly steel?

Simon · « **Reply #20 on:** January 16, 2008, 02:33:22 pm »

Okay thats my template

Aluminium is fine (well so far) I only said steel as a precaution, aim for thicker the better,
don't forget the area the skewer mounts against needs to be thinner other wise the skewer won't be long
enough to go through the nut end.
Failing that you may need to get a longer skewer (Hope use to do some)

Simon.

Simon · « **Reply #21 on:** January 16, 2008, 02:40:10 pm »

Oh and this is one of my ways I routed a hose

Simon.

Simon · « **Reply #22 on:** January 16, 2008, 02:43:38 pm »

And another one

Simon

rapiddescent · « **Reply #23 on:** January 19, 2008, 05:24:12 am »

6mm 6061 seems a little fragile to me, we always used a rather expensive steel (which won't cut with a hacksaw!) and made the HammerHead adapters 4mm on the rear and 5mm on the front.

The thing to watch out for if you are making these for carbon bikes is the heat transfer - if you use aluminium you *will* melt the epoxy glue on the swingarm and it will end in tears. This is why we used the expensive stuff because it did not transfer heat. With the old formula B4 brakes with the wee 140mm rotor we did think about attaching heatsinks to the end of the hose but in the end it was not really needed.

Obviously, Al swingarms aren't affected by heat.

we only have a few Hammerheads left now and we're not going to be making any more because we very rarely get asked for them now.

callum
rds

shovelon · « **Reply #24 on:** January 19, 2008, 10:45:32 am »

4130 is a steel alloy and will rust, but it is stronger than mild steel and conventional stainless steel.

6 mm alum should be good enough as long as you don't soften it with welding, and you have enough material around the bolt holes. But 8 mm is rock solid, and you could always reduce the thickness later for some wieght savings.

kiwi · « **Reply #25 on:** January 19, 2008, 03:57:05 pm »

wow just noticed simons disk mount allows the hose to go through the swingarm!

orange · « **Reply #26 on:** January 20, 2008, 01:05:57 am »

don't know how the *hell* he got that snaky thing through!!!!!

shovelon · « **Reply #27 on:** January 20, 2008, 06:58:35 pm »

Man, I did not catch that till you pointed it out. Very interesting.

Simon · « **Reply #28 on:** January 21, 2008, 09:57:08 am »

Quote from: orange on January 20, 2008, 01:05:57 am

don't know how the *hell* he got that snaky thing through!!!!!

Easy

Simon.

timboiow · « **Reply #29 on:** January 22, 2008, 09:25:05 am »

Wow, This forum has a great collection of material specialists (probably better than many aerospace companies). Thanks for all the info guys, Simon Pearce has made a neat adaptor which I can hopefully purchase (or else it down to the Aluminium scrap bin and see if i can identify a suitable piece of 6mm that is unwanted).
I love Simons solution for the 856 swingarm, super neat and tidy (this seems to be a common theme of Simons work!) and i must wonder why proflex never did a production version like this. It would be great to route the disc hose through the 857 swingarm, but there's nothing at the pivot end to get it out of (and without knowing whether there was reinforcement for the gear side cable exit i wouldn't like to drill the swingarm).
Hopefully with all this info i can egt the rear disc brake sorted andthe 857 back on (or with this rain "In") the trails.
Cheers all
Timbo

News:

Menu

Picture Bit

Author Topic: disk brakes query (Read 9980 times)