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#17355 - 04/07/03 07:16 PM Re: axis rotation & axis tilt *****
Anakin Skywalker Offline
League Bowler

Registered: 02/09/01
Posts: 86
A/S/L: Jedi have no need for this inf...
I still think the best way to describe the differences between axis tilt and axis rotation is the Dukes of Hazzard model.

When Bo and Luke Duke drive the car and do a side wheelie on the two left tires, the tires are still pointed straight ahead, but they're on their side a bit. About 20-30 degrees maybe? That is axis tilt.

When Bo and Luke Duke make a U-turn at about 45 miles an hour, they turn the steering wheel as far to the side as the wheels can go - that is axis rotation. Going straight is zero degrees axis rotation - turning left is about 45-50 degrees axis rotation.

Now imagine them turning left while doing the side wheelie - that tire has 45 degree axis rotation and about 25 degree axis tilt.....

...THAT is what a bowling ball does wink

(I loved that TV show) laugh
"One day I am going to be the most powerful Jedi ever!"

Algebra for Prebowlers:
15X + 21EX = 900

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#17356 - 04/15/03 08:06 AM Re: axis rotation & axis tilt
Coachrich Offline
Regional Pro Contender

Registered: 04/03/01
Posts: 569
A/S/L: Chesterland, Ohio
The key to teaching is being able to relate the theory to something the learners are familiar with. EVERYBODY knows about them Duke boys and their antics with the General Lee.

Nice Job Anakin.

#17357 - 05/23/03 01:27 PM Re: axis rotation & axis tilt
Tblues Offline

Registered: 07/08/02
Posts: 15
A/S/L: M/South Texas
Can you do that analogy again, but somehow work some Daisy Dukes into it?

South Texas

#17358 - 03/01/04 06:03 PM Re: axis rotation & axis tilt
PDUK1 Offline
Bumper Bowler

Registered: 02/03/04
Posts: 7
A/S/L: 36/M/UK
Hi All & Coach Rich

This is all very interesting and I often check my ball for oil from the ball return. I often find that there are often four to five rings of oil on my ball, running realtivly close to the thumb hole. What does this indicate, what should I be looking for, what is it that I am looking to acheive? Sorry if this is a basic question to a complex science!

Are there any good books that I can get. I did attend a [censored] Ritger camp many years ago when he came to the UK.

Kind Regards

Kind Regards


#17359 - 07/19/04 09:50 AM Re: axis rotation & axis tilt
Badger Offline
Bumper Bowler

Registered: 06/19/04
Posts: 3
A/S/L: 52 Male Cyprus
I would also like to know more about the oil ring on the ball. I have been told that if the ring is too near the thumb hole I should adjust my release. The person said that I should imagine a clock and place my thumb at about 11 o clock. I have questioned them again but I still cannot work out what they are trying to tell me. If this is not anything to do with axis of tilt and rotation I am sorry.


#17360 - 10/29/04 11:36 PM Re: axis rotation & axis tilt
JurseyJim Offline
Bumper Bowler

Registered: 09/30/04
Posts: 8
A/S/L: 49/M/NJ
I copied this from the ebonite site.

Axis tilt and axis rotation deal with the angle at which the ball is revolving. The ball revolves on two planes: 1) horizontal, and 2) vertical. The angle of the ball's revolutions dictates the resistance to forward roll. Resistance to forward roll is synonymous with skid, delaying the breakpoint of the ball. The breakpoint is the point on the lane where the ball starts to make its move to the pocket.

Axis tilt is the vertical angle at which the ball rotates. Axis tilt is what is commonly known as spin. Axis tilt is determined by the position of the thumb during the release. If the hand turns too early, the thumb exits on top of the ball. Bowlers with a high degree of axis tilt will be able to see the top of their hand during the release and follow through. Being able to have the thumb exit at the bottom of the down swing minimizes axis tilt.

Axis tilt will induce skid and reduce the amount of backend hook potential. With the core rotating in a more vertical fashion, oily lanes will be the enemy, drier lanes its friend.

Axis rotation is the horizontal measure of the angle of the ball's revolutions. It is also determined by the release. It is the release position of the fingers that dictates the amount of axis rotation. Axis rotation is commonly known as side roll. When the fingers exit the ball in a 6:00 position, the ball is sent into an end-over-end roll. This is known as 0 degrees of axis rotation, the absolute minimum. This ball will have no chance of hooking, regardless of the amount of revolutions, ball speed, and lane conditions. The ball will have immediate forward roll. Think of it as being behind the wheel of a car with the steering wheel straight. The tires will face in a north-south direction. The car will go straight, not being able to negotiate a curve in the road.

If the fingers exit the ball in a 3:00 position, caused by a rotation of the hand in a counter-clockwise direction, 90 degrees of axis rotation will result. This will give the ball a tremendous hook angle when it encounters friction. This is similar to being in that same car. However the steering wheel is now turned so that the tires are angled to the left. When the accelerator is engaged, the car will **** violently to the left. (For lefthanders, the fingers will exit the ball at a 9:00 position, the hand rotates in a clockwise direction, and the car wheels would be pointed to the right).

Most players have a finger exit somewhere in between 0 and 90 degrees. The halfway point, 45 degrees, will see the fingers exit the ball at 4:30 at the release point (7:30 for lefthanders). This is the most versatile release position. Please consult the Surface Friction Guide, True Grit, for pictures of axis rotation and axis tilt.

Axis rotation also will cause the ball to skid further but, unlike axis tilt, will cause a dramatic hook angle at the breakpoint. 90-degree axis rotation is often quite uncontrollable at the breakpoint. High degree of axis rotation players will also tend to like drier lanes; minimal axis rotation will tend to like more oil.

The ball, as it is rolling down the lane, will lose axis rotation due to encountering friction. The rate at which the ball loses axis rotation (side revolutions turning into end-over-end revolutions) will be determined by the initial axis rotation, the amount of ball speed, the amount of axis tilt, and the amount of oil on the lane. For the best carry percentage, we want the ball to lose axis rotation (enter into an end-over-end roll) just as it enters the pocket. This will give a strong angle of entry into the pocket and the proper amount of deflection.

Your Pro Shop technician will be able to assist you in determining your axis tilt and axis rotation. While it is not necessary to know the exact angle, knowing whether you have low, medium, or high amounts of each will make understanding your ball's reaction easier.

#17361 - 02/09/05 07:09 PM Re: axis rotation & axis tilt
cheetah Offline
Action Bowler

Registered: 02/04/05
Posts: 239
A/S/L: 29/M/Seattle, WA/Right-handed
A few years ago, someone pointed out that on my release, I was coming around the side too much, and the ball was spinning more than it was rolling. They told me that the more the ball spins, the less the rotation of the ball translates it's momentum to the pins.

Is it safe to say that a ball that rolls and has a tight rotation about its axis will have a higher angular momentum, and therefore will drive through the pins more? Or is a level of deflection a good thing?

#17362 - 02/10/05 12:51 PM Re: axis rotation & axis tilt
802dave Offline
Action Bowler

Registered: 11/01/04
Posts: 201
A/S/L: 52/male/Fort Worth, TX
I think it was Marshall Holman that stated in his book that it is mainly a forward rolling ball that creates pin-clearing power; in other words minimal rotation and tilt.

According to Marshall, you want mainly forward revs; with a cupped wrist, release through the ball, not around it.

I do come around the ball somewhat, but I try to release through the ball at the target.

A little deflection is desirable or you end up with what I did a few weeks ago; I had the 1st nine and hung a 9-pin on the 1st ball in the 10th.

Hope this helps!
Visualize your Target Line!

#17363 - 02/10/05 06:34 PM Re: axis rotation & axis tilt
Coach04 Offline

Registered: 04/21/04
Posts: 1000
A/S/L: Male/Texas
Forward roll begins after pin migration, release determines the migration point in the ball path. You do not want minimal tilt and rotation. You want the amount it takes to cause the ball to migrate just before heading into the pocket. With some lane conditions that may be a minimal amount, others it may be a major amount.

It all depends on if the ball is going long, or going short. Learning to control axis tilt and rotation can make you a heck of a versatile bowler.

#17364 - 03/11/05 11:32 AM Re: axis rotation & axis tilt
cheetah Offline
Action Bowler

Registered: 02/04/05
Posts: 239
A/S/L: 29/M/Seattle, WA/Right-handed

The other night in league I was really frustrated because my ball was over-hooking, and someone pointed out that I was releasing with a 90 degree axis tilt. I had thought that I was releasing more end over end. How wrong could you be...?! So now I'm working on controlling my axit tilt.

So my question is, is 90 degrees too much for any lane condition, or are there times when it is appropriate?

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