Wheel Truing Tutorial

[datakoll]

On Feb 29, 3:48 am, datakoll <[email protected]> wrote:
> JB's style is of teaching methods.
>
> illustration for graphic use a teaching tool.
>
> nipple tighten nipple loosen...
>
> rim shown in hand external circumference, zoom in, see nipple head
> inside rim, say nipple tighten turned right , clockwise.
>
> clockwise arrow appears around nipple.
>
> turn rim viewing from hub position to inside rim circumference, zoom
> toward nipple/spoke junction,
>
> clockwise other side arrow duplicates self, you're now seeing two
> arrows either side rim, second 200 degree arrow around nipple spoke
> junction.
>
> view changes to bent rim, of 6 nipple section centered. comment.
> arrows appear, arrows turn, rim unbends (as a center turnout in a
> later segment). flip rim over and show both sides arrows turning with
> rim unbending.....
>
> go on to do the same with Quad retruing, hub centering of the egg
> shaped rim...

 

[M-gineering]

IK wrote:
> BicycleTutor <[email protected]> wrote in news:f4f7f692-4543-46ad-
> [email protected]:
>
>> http://bicycletutor.com/wheel-truing/
>
> Inaccurate and illiterate.
>
>> Pre-stressing spokes<
>
> Whow? Pre-stressing? Not stress-relieving?
>
>> Remember that on the rear wheel, the right side spokes have a lesser
> angle and effect lateral movement less than the left. The left side spokes
> have greater angle and effect radial alignment less than right. To
> compensate for this difference, the right side spokes should be adjusted
> two turns for every turn on left. <
>
> Really? Two turns? Not a turn and a half? Or one and one-quarter?
>
> Hopeless.....

Really? I think it covers the basics pretty well, and should meet the
needs of a novice who wants to fix a wheel

Ofcourse if you want to discuss the finer points of 'the correct
nomenclature in scientific wheelbuilding' the lack of footnotes in
footnotes should make it clear this isn't for you
--
/Marten

info(apestaartje)m-gineering(punt)nl

 

[datakoll]

On Feb 29, 3:50 am, datakoll <[email protected]> wrote:
> On Feb 29, 3:48 am, datakoll <[email protected]> wrote:
>
>
>
> > JB's style is of teaching methods.
>
> > illustration for graphic use a teaching tool.
>
> > nipple tighten nipple loosen...
>
> > rim shown in hand external circumference, zoom in, see nipple head
> > inside rim, say nipple tighten turned right , clockwise.
>
> > clockwise arrow appears around nipple.
>
> > turn rim viewing from hub position to inside rim circumference, zoom
> > toward nipple/spoke junction,
>
> > clockwise other side arrow duplicates self, you're now seeing two
> > arrows either side rim, second 200 degree arrow around nipple spoke
> > junction.
>
> > view changes to bent rim, of 6 nipple section centered. comment.
> > arrows appear, arrows turn, rim unbends (as a center turnout in a
> > later segment). flip rim over and show both sides arrows turning with
> > rim unbending.....
>
> > go on to do the same with Quad retruing, hub centering of the egg
> > shaped rim...- Hide quoted text -
>
> - Show quoted text -

off course, a true line appears outboard bent rim section, and a close
up of rim squeezing over to true line.

if drawn then thought about, more examples and procedures surface,

 

[Ozark Bicycle]

On Feb 28, 8:13 pm, "Skip" <[email protected]> wrote:
> > Because JB is snotty and pedantic.
>
> Yes, but Jobst also knows his stuff cold and is a true expert on the bicycle
> wheel.
> You won't find a better "expert".


The above proves that, indeed, "you can fool some of the people all of
the time".

 

[Tosspot]

Ozark Bicycle wrote:
> On Feb 28, 8:13 pm, "Skip" <[email protected]> wrote:
>>> Because JB is snotty and pedantic.
>> Yes, but Jobst also knows his stuff cold and is a true expert on the bicycle
>> wheel.
>> You won't find a better "expert".
>
>
> The above proves that, indeed, "you can fool some of the people all of
> the time".

And looking in the mirror I'd agree with you.

 

[Ozark Bicycle]

On Feb 29, 2:32 pm, Tosspot <[email protected]> wrote:
> Ozark Bicycle wrote:
> > On Feb 28, 8:13 pm, "Skip" <[email protected]> wrote:
> >>> Because JB is snotty and pedantic.
> >> Yes, but Jobst also knows his stuff cold and is a true expert on the bicycle
> >> wheel.
> >> You won't find a better "expert".
>
> > The above proves that, indeed, "you can fool some of the people all of
> > the time".
>
> And looking in the mirror I'd agree with you.

Your mirror, your eyes, your visage.

 

[Tom Sherman]

datakoll aka gene daniels wrote:
>
> no seriously, what Jay wants to do is teach wheel trueing and he's
> succeeding.
> I try it here. I could just as well walk in front of a bus.

Perfectly harmless as long as the bus is stationary.

--
Tom Sherman - Holstein-Friesland Bovinia
The weather is here, wish you were beautiful

 

[Tom Sherman]

[email protected] aka Jobst Brandt wrote:
> Tom Sherman wrote:
>
>>> ... I think the concept of pre-stressing has been here often, as
>>> in pre-stressed concrete that has much in common with pre-stressed
>>> spokes, except that concrete cannot support tension and spokes
>>> cannot support compression without being pre-stressed.
>
>> That is not entirely true. When a compressive load is applied to
>> the top of a slab over a limited area, does it not result in tensile
>> stresses in the bottom portion of the slab below the "neutral axis"?
>
> Bridges and other structural beams have tensile preload rods internally
> to insure that the entire beam is in compression even though most of
> the tensile elements are in the foot of the cross section.
>
Actually, post-tensioning is more common on larger structures, since
pre-stressing outside of items that can be made in a plant is not very
practical.

> The
> condition you cite would cause cracking (failure) but structures are
> not designed or loaded that way if they follow prudent procedures and
> of course the building code.
>
Specifically, ACI 318 "Building Code and Commentary".

>> And do concrete pavement slabs generally fail from fracture due to
>> tension in the bottom of the slab from a single load, or from
>> fatigue from many load cycles? The answer should be obvious to
>> anyone who know about pavement engineering.
>
> They fail for insufficient reinforcement (steel) but they are not
> pre-stressed in roads I have seen built other than bridges, and they
> were pre-stressed.
>
All plain reinforcement does for slabs is to hold the pieces together
AFTER the slab cracks. Portland cement concrete will fracture at a
strain where the reinforcing steel is far below yield, and the
reinforcement does little to reduce fatigue stress.

There are some post-tensioned on-grade pavements, but they are rare.
Post-tensioned bridge decks (and floor slabs in mid-rise and high-rise
buildings are common).

>> Fiber reinforced concrete is not pre-stressed, and the fibers do
>> increase tensile strength (as evidenced by the fibers increasing the
>> rupture modulus for a given mix).
>
> That's a composite and I am not familiar with that use. It seems
> highly difficult, considering the elastic modulus of stone and fibers
> one might use. I suppose asbestos might be a candidate. I don't know.
>
Fiber reinforced concrete floor slabs (in industrial applications) and
pavements are quite common. The fibers can be polymers or deformed
steel. The fibers make quite a difference in rupture modulus, which is
typically determined by breaking beam specimens in either third-point or
half-point loading.

--
Tom Sherman - Holstein-Friesland Bovinia
The weather is here, wish you were beautiful

 

[Tosspot]

Ozark Bicycle wrote:
> On Feb 29, 2:32 pm, Tosspot <[email protected]> wrote:
>> Ozark Bicycle wrote:
>>> On Feb 28, 8:13 pm, "Skip" <[email protected]> wrote:
>>>>> Because JB is snotty and pedantic.
>>>> Yes, but Jobst also knows his stuff cold and is a true expert on the bicycle
>>>> wheel.
>>>> You won't find a better "expert".
>>> The above proves that, indeed, "you can fool some of the people all of
>>> the time".
>> And looking in the mirror I'd agree with you.
>
> Your mirror, your eyes, your visage.

'Twas my point, fooling some of the people all of the time seems to be
trotted out by people trying to fool all of the people some of time,
which leads to suspect very little is believable in this world. Apart
from the fact that GWB was piloting the WTC planes by remote control
with Elvis acting as copilot. This is fact.

On a related note, I've had two driveside spokes fail in around 6,000
miles commuting. One failed at the knee, which I took to be an
undertensioned wheel (I built it), the second went a few millimetre
further up, shearing across the spoke around 3,000 miles after the
first. No signs of rubbing, or other defect, it looks like it just
broke. I'm sure these are up to full tension, but I don't have a
calibrated tensiometer to check.

Any ideas that could be checked without too much complexity? Wish I'd
kept it and photographed it now

 

[datakoll]

> I think that is generous criterion.
>
> Jobst Brandt

Jobst,

add an essentail visual action scene for a hypothetical spoke graphic
tutorial?

g.daniels

 

[datakoll]

sure. after insertion then after tensioning, lube and fill spoke holes
and cover 4 flange sides with Finish Line dry lube