Re: rear rim seems to rub

Luns Tee wrote:
In article <vaidncGliJ07zKHanZ2dnUVZ_tyknZ2d@xxxxxxxxxxxxx>,
jim beam <spamvortex@xxxxxxxxxxxxxxx> wrote:
Luns Tee wrote:
In article <GOCdnY7kbLrAMaTanZ2dnUVZ_jmdnZ2d@xxxxxxxxxxxxx>,
jim beam <spamvortex@xxxxxxxxxxxxxxx> wrote:
Luns Tee wrote:
In article <oZWdnS6ivZi-fKranZ2dnUVZ_jCdnZ2d@xxxxxxxxxxxxx>,
jim beam <spamvortex@xxxxxxxxxxxxxxx> wrote:
If the ratio of the caliper as a whole is 2:1 as you say, the
force being transmitted across the rim is 200N. How is 100N on the cable
side of the Y arm, vs. 200N on the pad side of the Y arm an equilibrium?
"floating" of the rim. just like in the avid mechanical disk brake caliper.
Floating only means that the supposed 200N from the C arm pad
is carried through to the Y arm pad, but the question is of how the Y
arm is able to press 200N against this - this is implicit in the
question I pose. Repeating part of the question is not an answer to
the question. You still have not addressed the question of how a 1:1
lever can have forces on it in a 2:1 ratio yet be in equilbrium.
no, reconsider the avid disk caliper i mention. one pad is completely fixed, but braking force is applied equally from both pads because the disk floats. rims do the same.
The one-side-fixed caliper is not a valid analogy: a 1:1 lever
between the pad and cable clamp is not a fixed stop. If the Y arm were a
fixed stop, then it would not rotate on its pivot, and we're left with a
single-pivot brake. What is under discussion is dual-pivot brakes.
but luns, with respect, if the y-arm is fixed, you have exactly the same
braking as with the avid disk brake.
IF the y-arm is fixed, then I agree with the avid brake as a
model. However, you yourself have claimed that the Y arm is free to
pivot, independently of the C arm at that.
it can be compressed independently of the c-arm.


What makes the Y arm, that
is otherwise free to pivot, into a fixed stop?
application of pressure from the brake cable.

That is NOT a fixed stop. A freely pivoting 1:1 lever transmits
force from the pad through to force at the cable in a 1:1 ratio. So I
ask you one more time, with 100N of cable tension, if things are as
you say, how does 200N at the pads constitute an equilibrium?

Things work differently in the "beamian" world?

--
Tom Sherman - Holstein-Friesland Bovinia
"the grinning buddy bear carries a fork." - g.d.
.

Relevant Pages

  • Re: rear rim seems to rub
    ... balance, and a 20kg weight on the other, the two are ... asking you how you think the Y arm can be in equilibrium. ... after the cable and pad have been accounted for. ... dual-pivot brake does not move the rim when it is applied. ...
    (rec.bicycles.tech)
  • Re: rear rim seems to rub
    ... jim beam wrote: ... force being transmitted across the rim is 200N. ... side of the Y arm, vs. 200N on the pad side of the Y arm an equilibrium? ...
    (rec.bicycles.tech)
  • Re: brakes locked?
    ... the brake pedal, you start out lightly and gradually and smoothly ... solid right now at the bike rack have to lift up front tire to move bike. ... Mongoose) diving under the rim. ... the pad dives under the rim. ...
    (rec.bicycles.tech)
  • Re: rear rim seems to rub
    ... jim beam wrote: ... side of the Y arm, vs. 200N on the pad side of the Y arm an equilibrium? ... braking as with the avid disk brake. ...
    (rec.bicycles.tech)
  • Re: rear rim seems to rub
    ... force being transmitted across the rim is 200N. ... side of the Y arm, vs. 200N on the pad side of the Y arm an equilibrium? ... just like in the avid mechanical disk brake caliper. ...
    (rec.bicycles.tech)