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Your Axis tilt and axis rotation


Many  bowlers confuse  axis tilt with axis rotation. Axis rotation is determined  by the amount of side roll that your turn applies to the bali. Axis tilt is the  spin that you put on the ball. Tilt increases as the circumference  of the ball track lessensthere's  more tilt with a spimerand  less rilt with a high track.
To determine  the tilt of your  axis,  you must find the axis of the ball's rotation. Throw a few balls on the oiliest part of the lane so you have an oil track all the way around the ball. Thke a grease pencil and trace that oil track all the way around the ball. You want to use the track  that is the closest  to the finger and thumb  holes. That's  your track for the initial  rotation  of the ball on the lane (most  of today's  ball flare finds the ffack and axis  changing  as the ball rolls  down the lane).
Once you have marked  the initial rotation/track  of the ball, place  the ball in a small  ashtray  on a table. Rotate the ball until the track  is horizontal  to the table. Now take a flexible measuring  tape  and measure  the distance from the track on one side of the ball over the top to the
track on the other side of the ball. Use  a grease pencil  to mark  the point on the top of the ball that is half the distance  from the two sides of the track. Now rotate the ball a qualter-tum  while keeping the track horizorial, and repeat  the measuring process. Mark the point that these two lines intersect with a piece of tape or a round dot. This is the axis point of your  ball's rotation.
The tilt of the axis is determined by the track of the ball. If the track of the ball covers 27 inches,  which is the full circumference of the ball, there would be no tilt. This type of roll is normally a complete straight  ball that rolls right over the middle of the finger  holes and thumb hole. A semi-roller  track covers  less of the circumference  of the ball and will have some tilt. The  spinner  frack will have the most tilt.

If the track  covers the full circumference of the ball and has zero degrees tilt, how do we determine  how much tilt the other tracks have? The easiest way to measure the tilt of the axis is by, again, marking the first track around the ball. Find your  axis point  and mark it. Next, put
the ball in a small ashtray on a table  and rotate  the ball so the bottom  ofthe track is in the middle of the bottom of the ball on the table.  Then rotate  the ball until the track is facing  you, so you can see the bottom and top of the track in front of you. Then mark a line around  the ball that is right in the middle of the ball. From rhis line, you can measure the distance  from the line to the axis to see how far the axis is from the center of the ball. Every  1 1/8 inches the axis tracer is above the center line represents  15 degrees of tilt.
By Bill Spigner - Bowling clinic - Bowling Digest


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