"correct" measurement of truck angle

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Andrey Aseev
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"correct" measurement of truck angle

Post by Andrey Aseev » Fri Jun 01, 2012 11:51 am

Training material on the "correct" measurement of truck angle. For someone it not new...


Direct translation from Russian.
Kingpin angle vs ...

The text means will be in English, I will make comments in Russian. Let's roll.

The standard way of control by means of inclined pro-rates (in the people of "corners" or "wedges") is the indication of the gathered total degree measure equal to a relative inclination kingpin which actually has a degree measure relatively baseplate which and is a degree measure baseplate. Smoked? We go further. The degree measure standardly is considered positive for front trucks and negative for rear. We look.
Well and actually the question and sounds. "And so?"
"Nothing".

As an example we take pictures "control GOG`s for idiots", consisting of 3 points.

So.
Experience the 1st. GOG Foxy, Randal based.
Point 1st.
Step-step-step... We put kingpin vertically.
Point 2nd.
We put a zero mark.
Point 3rd.
We establish the RECOMMENDED corner in 60°
Cool...

Experience of the 2nd. GOG Homer, Bennette based.
Point 1st.
Step-step-step... We put kingpin vertically.
Point 2nd.
We put a zero mark.
Point 3rd.
We establish the RECOMMENDED corner in 30°.
Cool...

"And what!?" That we as a result received?

60 it is not equal 30?
Or 60° more 30°?
Or 30° less 60°?

Attentively we look at point 2.
We note a zero mark, but where this zero? Kingpin at us is PERPENDICULAR the planes of movement and be zero WELL CAN not IN ANY WAY! And perpendicular it that Corner 90°. Let's read these 90° and we look for that at us is parallel to the movement plane. There is such letter. It also passes... through pivot.

We put a zero mark.
0°?
0°!
Point 3rd.
We establish a recommended corner in 60°
60°?
60°!
Cool...

They be the academician of GOG Homer.
Search that we have parallel to the movement plane. Is? No. And how at us passes an axis pivots? And at an angle 30°.
We grade.
0°?
WRONG!!! 30°! which are own corner trucks.
Point 3rd.
We establish a recommended corner in +30°.
60°!
60° = 60°!
Cool...
We take Bennett's standard control. Shock risers Khiro's corners about 8° in quantity 2x pieces plus own corner 45° we receive the same 60°.
Cool...

At whom difficulties with calculation, I will notice that for Randal based the axis corner pivots coincides with own corner baseplate at the expense of perpendicularity to kingpin. At Bennette based the situation is slightly more difficult, but, in principle, easily calculated. Bennett has own corner of an axis pivots 45°. IndeeSZ also 45° so on foolish question "on what corner to adjust IndeeSZ" the same foolish answer "To the same, as Bennett".
"New shool". Here, as they say, as will guess. As they were born as a result of regresse from "Old shool" towards shock durability.

So. Thus we received the uniform mechanism and a control principle not the dependent... instead of from what and not the dependent. Not from kingpin, not from baseplate. Establishing pro-rates, simply add or diminish their corner from a degree measure of an axis pivots. To adjust similarly any other trucks? If know its inclination through an axis pivots, as two fingers. And any negative corners and kingpins. But! For alternative baseplates it will be necessary to know a relative increase. Serious producers give it. Tell cindrich 25° for Bennett gives an increase at once in 15° and truck further control by wedges doesn't need.

I will give the developed traditions in degree measures. Front/back. Downhill 45-50°/20-35°. Slalom 55-65°/15-35°. The carving is a separate subject for creativity. As a rule it is equal corners around 50°. Still small nuance. By the most ideal will measure a tilt angle truck concerning the movement plane, but... it isn't so simple, so and relatively decks will not so badly.

Now we change prompt.
Kingpin angle vs Pivot angle.
Who won, to solve to you.

Postscript. Strongly don't rejoice. Despite that the angle of rotation of a wheel axis separately taken truck at an equal tilt angle truck and an equal tilt angle imagined decks is absolutely identical, on collected complete absolute compliance between trucks won't be. The matter is that "an inclination of an axis of an inclination of a board", depending from "offset of a wheel axis both trucks", and also a tilt angle trucks. Well and for downhill trucks with zero offset of a wheel axis compliance always will be absolute. For specularly standing identical trucks too. Though to someone pleasure.

Pierre Hazera
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Joined: Sun Jan 28, 2007 2:29 pm
Location: France, Aquitaine, Bordeaux
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Re: "correct" measurement of truck angle

Post by Pierre Hazera » Fri Jun 01, 2012 3:25 pm

thanks this is good

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