Hey everyone !

after reading several articles about ball motion from the forums wiki, i stuck at this sentence from the "Not quite so simple" article by Mo:

Ball reaction is the accumulated effect of......

•The position of the pin to spin line in relation to the migrating axis of rotation of the ball.

What is the "pin to spin line" ?

Thanks for explanation.

A line drawn from the Pin to PSA is known as the pin to spin line.

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ahh, ok, thank you.

Why doesnt call it the "base line" like in his Dual Angle Guide ? Its the same, isnt it ?

May i ask how the "pin to spin line " and "the axis migration path" work together for ball motion ?

the axis migration path will tend to stay in direction of the same RG value ( of the PAP ) migrating to the low rg axis while runnig down the lane, right ?

So its about the angle of the pts-line to the migration path or the distance or when they perhaps intersect ?

Hard to get it for me...

The migration direction seems to by affect by differential ratio of the drilled ball.

Page 45 - 50

http://wiki.bowlingchat.net/wiki/images ... eminar.pdf

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Adrian
Right handed
PAP: 5 1/8 up 3/4
Speed: 15.5 mph (Kegel Specto)
Rev: 350 RPM
Axis tilt: 18-20*
Axis rotation: 60*

Because it's being used in a different context for what's being discussed.

In the Dual Angle guide it's just called the "Base line" because it's talking about laying out balls and that line is what the layout is "based" off of.

(Also if you look at the Guide the baseline is located/drawn differently depending on if the ball is a Asym. or a Sym. so you couldn't really call it the pin to spin line in both cases.)

It's like the starting line on a racetrack, at the start of the race it's called the "starting line" at the end of the race it's called the "finish line". It's the same line it's just being referred to differently because it's being used in a different context.

_________________
Click my green + rep button if this helps!
"REMEMBER, it isn't how much the ball hooks, it's where."