lockdown 2020/2021 project

Show us what you're working on (MT or very very closelyy related subjects only please).
Gbo
Posts: 52
Joined: Mon Oct 19, 2020 7:45 pm
Location: Uk

Re: lockdown 2020/2021 project

Post by Gbo » Wed Jan 13, 2021 8:17 pm

What about not having the clamp too tight and using an engineering adhesive. I know some people will scoff but some very safety critical items are glued on.
0 x

deadgrass.
Posts: 1178
Joined: Sun Jun 21, 2015 5:32 pm
Location: sheffield

Re: lockdown 2020/2021 project

Post by deadgrass. » Wed Jan 13, 2021 9:19 pm

Gbo wrote:
Wed Jan 13, 2021 8:17 pm
What about not having the clamp too tight and using an engineering adhesive. I know some people will scoff but some very safety critical items are glued on.
nice one dint think of glue,
i guess i need to field test but that will be a while with whats goin on at the moment,
i have pull the brake lever probably harder than i would riding to see if it would twist or deflect the long bracket to the caliper but i can only see the disc bending as pressure is applied,

dave
0 x
born to be waserk
thank god for atheism.
sometimes your front legs need to be stiff and the fur on your arse vertical.

Gbo
Posts: 52
Joined: Mon Oct 19, 2020 7:45 pm
Location: Uk

Re: lockdown 2020/2021 project

Post by Gbo » Thu Jan 14, 2021 6:25 am

I think if you use adhesive, put some stops on the clamp so that the bolts can be fully tightened without crushing fork.
1 x

Vtrsp1da
Posts: 622
Joined: Thu Jun 18, 2015 10:48 am
Location: Bisley
Location: Bisley

Re: lockdown 2020/2021 project

Post by Vtrsp1da » Thu Jan 14, 2021 6:53 pm

Dave

You have a email
0 x

CJ-MT
Posts: 14
Joined: Tue Feb 07, 2017 6:55 pm
Location: Devon UK

Re: lockdown 2020/2021 project

Post by CJ-MT » Thu Jan 14, 2021 6:56 pm

Hi, I made a similar clamp around 10 years ago. Having a machine shop I made it out of aluminium and used the torque arm lug as a means to stop it swivling around. I used M12 bolts in the clamp, I found that more than the lightest pinch of the fork leg will jam the fork slider. I used some lock tight (blue) and lightly nipped up the bolts to hold it on the fork leg.

Caliper used was a twin pot "Nisin"? and is quite capable to lock the front under heavy braking.
I've had many good years riding with this arrangement, 100 times better than the original drum.
The only problem I had was corrosion of the aluminium, should have got it anodised.
1 x

Vtrsp1da
Posts: 622
Joined: Thu Jun 18, 2015 10:48 am
Location: Bisley
Location: Bisley

Re: lockdown 2020/2021 project

Post by Vtrsp1da » Thu Jan 14, 2021 8:30 pm

Pm sent
1 x

geoffbarnett
Posts: 186
Joined: Sat Jun 20, 2015 8:01 am
Location: Keyham Leicestershire

Re: lockdown 2020/2021 project

Post by geoffbarnett » Fri Jan 15, 2021 1:38 pm

As I understand it, according to Newton's third law (equal and opposite reaction), applying the brake wiil attempt to move the caliper in the direction of rotation of the disc...not up and down.
0 x

geoffbarnett
Posts: 186
Joined: Sat Jun 20, 2015 8:01 am
Location: Keyham Leicestershire

Re: lockdown 2020/2021 project

Post by geoffbarnett » Fri Jan 15, 2021 1:41 pm

Correction - opposite to the direction of the disc - but still, not up and down.
0 x

User avatar
Laurence
Posts: 416
Joined: Thu Jun 18, 2015 1:43 pm
Location: Tunbridge Wells

Re: lockdown 2020/2021 project

Post by Laurence » Fri Jan 15, 2021 6:54 pm

geoffbarnett wrote:
Fri Jan 15, 2021 1:38 pm
Newton's third law
I think there’s more at play here than just the 3rd law.
The rotation of the brake disc causes a centripetal force towards the centre of the disc and a centrifugal force outwards. When the centripetal force is broken/interrupted the resulting force is linear and perpendicular to the direction of rotation. This might result in the calliper trying to move up the leg?
0 x
..VFR 400..
..MT 350..
..Enfield Explorer..

Wirralman
Posts: 6261
Joined: Fri Jan 16, 2009 9:45 am
Location: Wirral, Merseyside

Re: lockdown 2020/2021 project

Post by Wirralman » Fri Jan 15, 2021 7:06 pm

Laurence wrote:
Fri Jan 15, 2021 6:54 pm
geoffbarnett wrote:
Fri Jan 15, 2021 1:38 pm
Newton's third law
I think there’s more at play here than just the 3rd law.
The rotation of the brake disc causes a centripetal force towards the centre of the disc and a centrifugal force outwards. When the centripetal force is broken/interrupted the resulting force is linear and perpendicular to the direction of rotation. This might result in the calliper trying to move up the leg?
I think that the effect of the light disc will be literally out-weighed by the weight of the rim and tyre at greater radius :?:
0 x

Post Reply

Who is online

Users browsing this forum: No registered users and 3 guests