Bowling ball angulator and methods of use

A method for marking a thumb aperture angle on an undrilled bowling ball, said method comprising the following steps:

• (a) providing a bowling ball having an exterior surface with a thumb aperture center and a grip centerline marked thereon;
• (b) rotating about said thumb aperture center a given thumb aperture angle degrees from said grip centerline;
• (c) creating a mark on said exterior surface of said bowling ball to indicate said given thumb aperture angle degrees from said grip centerline;
• (d) placing a straight edge on said exterior surface of said bowling ball from said thumb aperture center to said mark in step (c);
• (e) drawing a line on said exterior surface of said bowling ball from said thumb aperture center to said mark in step (c);
• and
• (f) extending said line on said exterior surface in an opposite direction than that drawn in step (e).

A method for locating a positive axis point of a drilled,bowling ball, said method comprising the following steps:

• (a) providing a bowling ball;
• (b) rolling said bowling ball down an oiled lane;
• (c) marking a track defined by oil from said oiled lane on said bowling ball;
• (d) placing said bowling ball on a surface such that a plane defined by said track is parallel to said surface and said track is as close to said surface as possible;
• and
• (e) locating said positive axis point by finding a spot on a portion of the bowling ball farthest away from said surface that is equidistant to at least three points on said track.

A method for measuring a bowling bowl positive axis point vertical coordinate, said method comprising the following steps:

• (a) providing a bowling ball including an exterior surface having a grip center, a centerline of a grip, and a positive axis point marked thereon;
• (b) drawing a first line perpendicular to said centerline on said bowling ball starting from the grip center and extending toward and beyond said positive axis point;
• (c) drawing a second line perpendicular to said first line in step (b) starting at said positive axis point and extending to said first line in step (b);
• (d) marking an intersection of said first line and said second line from steps (b) and (c);
• (e) measuring a distance of said second line from step (c) starting from said positive axis point to said intersection in step (d).

A method for measuring a bowling bowl positive axis point horizontal coordinate, said method comprising the following steps:

• (a) providing a bowling ball including an exterior surface having a grip center, a centerline of a grip, and a positive axis point marked thereon;
• (b) drawing a first line perpendicular to said centerline on said bowling ball starting from the grip center and extending toward and beyond said positive axis point;
• (c) drawing a second line perpendicular to said first line in step (b) starting at said positive axis point and extending to said first line in step (b);
• (d) marking an intersection of said first line and said second line from steps (b) and (c);
• and
• (e) measuring the distance of said first line in step (b) starting at said intersection in step (d) to said grip center.

A method for measuring a block angle of a drilled bowling ball, said method comprising the following steps:

• (a) providing a bowling ball including an exterior surface having a center of gravity, a pin, and a positive axis point marked thereon;
• (b) drawing a first line on said exterior surface from said pin to said center of gravity;
• (c) drawing a second line on said exterior surface from said pin to said positive axis point;
• and
• (d) measuring an angle between said first line in step (b) and said second line in step (c).

A method for placing a positive axis point of an undrilled bowling ball, said method comprising the following steps:

• (a) providing an undrilled bowling ball having an exterior surface with a pin and a center of gravity marked thereon;
• (b) providing a block angle and a desired pin distance from the pin to the positive axis point;
• (c) drawing a first line on said exterior surface from said pin to said center of gravity;
• (d) rotating about said pin from said center of gravity a distance equal to a number of degrees in said block angle;
• (e) creating a mark on said exterior surface of said bowling ball where said distance in step (d) is equal to the number of degrees in said block angle;
• (f) drawing a second line on said bowling ball from said mark in step (e) to said pin;
• (g) measuring from said pin to a point along said second line in step (f) that is a distance equal to said desired pin distance from said pin;
• and
• (h) marking a location of said point in step (g) on said exterior surface of said bowling ball.

A method of placing a positive axis point intersection point of an undrilled bowling ball, said method comprising the following steps:

• (a) providing an undrilled bowling ball having an exterior surface with a center of gravity and a positive axis point marked thereon;
• (b) providing a positive axis point vertical coordinate;
• (c) locating a point at a distance equal to said vertical coordinate from said positive axis point;
• (d) marking said point in step (c) as the positive axis point intersection point;
• (e) drawing a first line from said point in step (c) to said positive axis point;
• and
• (f) drawing a second line from said point in step (c) to an area of said bowling ball that will become a grip center;
• wherein said second line in step (f) is perpendicular to said first line in step (e).

A method of locating a center of a grip of an undrilled bowling ball, said method comprising the following steps:

• (a) providing an undrilled bowling ball having an exterior surface with a center of gravity, a positive axis point intersection point, and a positive axis point marked thereon;
• (b) providing a positive axis point horizontal coordinate;
• (c) locating a point on said bowling ball a distance equal to said horizontal coordinate from said positive axis point intersection point;
• and
• (d) marking said point in step (c) as the center of said grip.

A method for locating a grip centerline on an undrilled bowling ball, said method comprising the following steps:

• (a) providing an undrilled bowling ball having an exterior surface with a center of a grip and a positive axis point intersection point marked thereon;
• (b) drawing a first line from said positive axis point intersection point to said center of said grip;
• and
• (c) drawing a second line perpendicular to said first line in step (b) and through said center of said grip.