Large Pin-Out Information

Balls with large pin-outs [4 Ã?Æ?�Ã?¯Ã?¿Ã?½Ã?Æ?�Ã?â??Ã?½ - 5 Ã?Æ?�Ã?¯Ã?¿Ã?½Ã?Æ?�Ã?â??Ã?½] are sometimes a cause of concern. Included are three drillings for large pin-out bowling balls. The first two layouts place the pin well above the finger holes. This position will provide slightly more length than the more common lower pin layouts. The third layout produces an earlier roll giving the ball driller a full range of ball reaction options when drilling large pin-outs.

Tame Layout - Delayed Roll

Pin close to the span line above the fingers.

Aggressive Layout - Delayed Roll

Pin close to the leverage position above the fingers.

Aggressive Layout - Earlier Roll

Pin under the fingers

CG (Center of Gravity) in the 4:30 direction
X-hole to bring the ball back to statically legal.

Layout 1 - Tame Layout (Delayed Roll)

Description:

Pin above the finger 5 Ã?Æ?�Ã?¯Ã?¿Ã?½Ã?Æ?�Ã?â??Ã?½" from axis - Typical semi-roller
CG (Center Gravity)/Heavy Spot below the grip center for approx. Ã?Æ?�Ã?¯Ã?¿Ã?½Ã?Æ?�Ã?â??Ã?¾ oz. positive side weight.

Layout 2 - Aggressive Layout (Delayed Roll)

Description:

Pin above the finger 3 3/8" from axis - Typical semi-roller
CG (Center Gravity)/Heavy Spot below the grip center for approx. Ã?Æ?�Ã?¯Ã?¿Ã?½Ã?Æ?�Ã?â??Ã?¾" positive side weight.

Layout 3 - Aggressive Layout (Earlier Roll)

Description:

Place the pin near the span line, 5 Ã?Æ?�Ã?¯Ã?¿Ã?½Ã?Æ?�Ã?â??Ã?½" from axis and at least 1 Ã?Æ?�Ã?¯Ã?¿Ã?½Ã?Æ?�Ã?â??Ã?½" below the fingers.
Place the CG (Center Gravity)/Heavy Spot in the positive/thumb quadrant at a 4:30 orientation from the grip center.
Drill X-hole in the positive/thumb quadrant approx. 6 Ã?Æ?�Ã?¯Ã?¿Ã?½Ã?Æ?�Ã?â??Ã?½" out in the 4:30 direction, brining the ball back to statically legal amount of side weight.
This X-hole position will increase track flare and raise the bow-tie position making this layout usable for high to low track semi-roller players.

Basic Asymmetric Layout 1

Basic Asymmetric Layout 3

Basic Asymmetric Layout 4

Basic Asymmetric Layout 5

Basic Asymmetric Layout 6

Basic Asymmetric Layout 7

Basic Symmetric Layout 1

Basic Symmetric Layout 3

Basic Symmetric Layout 4

Basic Symmetric Layout 5

Basic Symmetric Layout 6

Basic Symmetric Layout 7

1-Leverage Pin with 9" Hole

2- Leverage Pin-Heavy Spot Toward Grip Center

3-Leverage Pin with Axis Hole

4-Positive Label Shift

5-Pin Between Axis and Leverage

6-Axis Pin with 9 Ã?Æ?�Ã?¯Ã?¿Ã?½Ã?Æ?�Ã?â??Ã?½" Hole

7-Negative Label Shift

Information on the 3 Piece Core

    The 3-piece, full-size core has been an industry staple throughout bowling's history. The original core construction of a bowling ball was a single density sphere. Technology evolved and a weight mass was placed inside the upper edge of the core to counterbalance the weight that is removed from the top half of the ball during the drilling process, creating top weight. Although there is not a limit on top weight in an un-drilled ball, the USBC restricts the amount of top or bottom weight in a drilled ball to 3 ounces. Ebonite's upper limit on top weight in an un-drilled ball is five ounces and lower limit is one and one-half ounces. The upper limit on lighter weight balls is on a descending sliding scale to reflect the density differences on the core weight. This ensures that the drilled ball will be within USBC specifications for top/bottom weight.

    A higher density polyester compound is poured into the core mold and is allowed to harden before the lower density material, which makes up the rest of the core, is added. This high density weight mass has the same round contour as the core on one side and is flat on the other side. Appropriately, the name "pancake" has been assigned to this weight mass. Bowlers found a stronger hook potential when the pancake was introduced to the core construction. The amount of top weight in an un-drilled ball can be altered by varying the density of the pancake material or by increasing its thickness. Higher top weight creates a ball reaction that goes further down the lane and has a stronger backend hook. Lower top weight causes an earlier breakpoint and a smoother hook pattern. The center of the top weight is signified by a mark called the center of gravity. It is called "CG" for short.

    Moving the CG above the center of span, towards the fingers, creates finger weight. This increases the skid characteristics of the ball. Moving the CG below the center of span, towards the thumb, creates thumb weight. This causes an earlier breakpoint. Moving the CG to the right of the center of span (to the left of the span for left-handers) creates positive side weight. This increases the overall hook. And moving the CG to the left of the span (to the right of the span for left-handers) creates negative side weight. This reduces the amount of hook. The USBC limit on finger, thumb, positive, or negative weights is 1 ounce.

    The 3-piece, full size core is higher in RG and low in RG Differential. The higher RG creates a delayed breakpoint. The low RG differential results in an easy to control, lower hook potential. The 3-piece core is best for drier lanes, slow ball speeds, and those who like to play a straighter line to the pocket.

    Choosing the proper ball construction and surface texture for your bowling style and lane condition will be the most important decision you and your pro shop operator will make. Choosing a drilling layout will alter the ball's characteristics within its performance parameters to fine-tune the overall reaction. Drilling layouts will not produce ball reaction without proper mechanics from the bowler and proper surface texture.

Layout 1 & Only! Label

Ball Choice:

All top weight

Reaction:

Delayed breakpoint, moderate backend on light to medium oil Suitable for.