Re: rear rim seems to rub

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.



One more time: how do you propose that the Y arm with 1:1 ratio
between lever and pad supports 100N at the cable and 200N at the pad as
you propose? I've asked this several times now, but you have yet to
give an answer other than waving your hands about the floating rim. The
floating rim is not an answer - it only deals with how the 200N gets to
the pad, not how the lever is able to support it.

disk brake!!! check it out.



A 1:1 lever with 100N pushing on one side and 200N pushing on
the other will retreat away from the 200N load until something changes
to affect the imbalance. If the Y arm were to run into a fixed stop,
then what you've been claiming would hold.
However, there is no such stop on the caliper. The only other
thing available for the Y arm to support the imbalance is the centering
linkage, which communicates with the C arm.


disk brake. check it out.
.

Relevant Pages

  • 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)
  • 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: 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)
  • 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)
  • Re: rear rim seems to rub
    ... arm with a 1:1 ratio from cable to pad, ... rim, I'm asking about a 1:1 lever which you claim can have 100N on ... Let me suggest once more that measuring the cable stroke vs. the ...
    (rec.bicycles.tech)