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  1. 7.4.15: mobi`dahon`brakes
    1. summary
    2. log
      1. 7.2.8: install new brake`cable:
      2. 7.1.13: rear brakes
      3. 7.1.24:  sci"cantilever brake design
      4. 7.2.6: front brakes
      5. 7.2.24: tire`chains:
      6. 7.3.20: tires/corrected puncture-resistance
      7. 7.3.1: direct-drive
      8. 7.4.29: todo"tires/polyurethane tire fill:

7.4.15: mobi`dahon`brakes

the brakes were reused without modificationwide view

summary

7.4.15:
. dahon`braking includes everything along the braking drive train: brakes, tires, chains,
and any ideas that affect the effectiveness of braking .

log


6.10.26: 2nd brake on drive wheel

. the front brake on the tour bike is being applied as
the 2nd brake on the foldingbike`s drive wheel,
(that frame has ports for both cantilever's found on new bikes
and the caliper's found on the tourbike

. complications were that I had no spindle for a rear brake,
and the long spindle of the front caliper
was getting in the way of the cantilever cables;
but even if I did have a rear brake,
it`s brake pads would interfere with the other pads
. I used spare parts shaped like thick washers
to extend the placement of the caliper away from the other .


7.2.8: install new brake`cable:

. install new dahon` brake`cable -- now both are functioning perfectly,
and if the vehicle can be stopped with one tire`s traction,
I'm sure this setup can do the job
. the universal brake cable with sheath couldn't be used as-is
because the the feed into the brake has no slot to lay the cable into
like the feed for the brake actuator does
but the cut was easy with wire clippers
applied to the thinnest part of the cable`s unneeded anchor block
(it had to them, of 2 kinds, hence the name "universal)
. the trying to clip the remainder close to the cable,
the whole thing snapped away, leaving a perfectly cut cable end to thread through the brake feed .

7.1.13: rear brakes 2brakes on one set of forks

 there was no good way to add the 10speed brake so I nixed it;
but, there are still 2 cantilever brakes (possible with existing anchors,
since the dahon is modified to fit 2 sets of forks on one wheel)
--. re 6.10.26:
.  the 10-speed`s front caliper brake are being added to the dahon`s rear forks
(that frame has anchors for both cantilever's found on new bikes
and the caliper's found on traditional tourbike)
. complications were that I had no spindle for a rear brake,
and the long spindle of the front caliper was getting in the way of the cantilever cables;
but even if I did have a rear brake, it`s brake pads would interfere with the other pads
. I used spare parts shaped like thick washers
to extend the placement of the caliper away from the other .

7.1.24:  sci"cantilever brake design

. experiment with shims that make up for the front forks being spread for use on the backwheel:
bewildered how those brakes work and why they have those rotatable washers,
when the entire assembly doesn't appear to support rotatability
. tried adding another washer when having trouble with pad rotating as I tighten it .

7.2.6: front brakes

  . on 7.1.13, both brakes needed wider shims
since the way I arranged the forks had wideneded them both

. each brake pad comes with both a thin and thick set of shims,
the back got thick, while the front (now in the back holding up the boom)
since those forks got widened a lot, got both thin and thick shims
 . later I looked into changing that, since it seemed rather unwieldy,
and found that the reason for having a pair on either side,
is that they are both pivoting so that the angle of the brake`arm
does not have to dictate the angle of the brake .

7.2.24: tire`chains:

. one way to form a chain is finding a flexable cuttable 2..3''-wide band;
fold in half, and make partial cuts,
so it forms a sort of ladder
. if the cuts are close eno' together,
then the sides will be able to fold down around the tire
. studs can be added by adding short bolts,
but the main traction should be from starting with a tough material that is thick;
however, in places where chains are required, they are expecting thick, hard metal to be biting the ice,
and this could require a more complicated design than is practical
(needs a promotion to wide tires and non-rim brakes);
so, it's best to avoid such roads with a velocar .
... should use back brakes and put std chains on them .


7.3.20: tires/corrected puncture-resistance

. tire had the wrong type of slime (tubless vs bike slime)
difficult recycling slime from front tire meant for rimless? just mop and toss;
refill tire with bike slime .

7.3.1: direct-drive

. investigate and eventually shelve plans for braking via direct transmission .

7.4.29: todo"tires/polyurethane tire fill:

. squirt the homedepot`Great Stuff into the leftover Slime bottle,
and then fill the innertube of the dahon`s front;
if that turns out ok, then do the same thing for the mobi`s dahon`wheel .