Like our FB page

Like our website
Tweet @bowlingball
Follow @bowlingball
+1 bowlingball.com
Manufacturer Ebonite Drilling Layouts
Return to Manufacturer Listing
What Line Do You Own
Platinum Series Gold Series Silver Series
Bronze Series Element Series Tornado Series

Tornado Warning Series
Premier Series Maxim Series

Tornado Series

Tornado Turqoise/Navy/Silver
Symmetrical Core Drilling Layouts
Tornado Black Sparkle
Symmetrical Core Drilling Layouts
Tornado Black/Red/Orange
Symmetrical Core Drilling Layouts
Tornado Navy/Red/Gold
Symmetrical Core Drilling Layouts
Tornado Navy/Green/Silver
Symmetrical Core Drilling Layouts
Tornado Navy/Silver/Gold
Symmetrical Core Drilling Layouts
Tornado Green/Purple/Navy
Symmetrical Core Drilling Layouts
Tornado Purple/Red/Gold
Symmetrical Core Drilling Layouts
Tornado Raspberry/Green
Symmetrical Core Drilling Layouts
Tornado Red/White/Blue
Symmetrical Core Drilling Layouts

Tornado Warning Series

Tornado Warning Burgandy/Purple/Gold
Symmetrical Core Drilling Layouts
Tornado Warning Navy/Orange Sanded
Symmetrical Core Drilling Layouts
Tornado Warning Red/White/Blue Pearl
Symmetrical Core Drilling Layouts

Premier Series


Maxim Series



Centrex Symmetrical Series Drilling Layouts

Layout 1

Drilling Layout 2
This is the recommended layout for most players.
If you do not have a positive axis, use this layout.
Ball Reaction:
Long and Strong
Suitable for:
Most Styles and Lines
Flare Potential:
Medium
Center of Gravity:
The center of gravity placement may or may not fall inside the CG Area. If it doesn't then the balance hole location may need to be adjusted.
Mass Bias Placement:
Place Mass Bias 3 inches to the right of the thumb hole If needed place balance hole 4 inches over and 1/2 inch up and drill back to statically legal.

Layout 2

Drilling Layout 2
This is the recommended layout for most players that have known axis measurements
Ball Reaction:
Long and Strong
Suitable for:
Most Styles and Lines
Flare Potential:
Large
Pin Placement:
Place Pin 4 1/2 inches from PAP
Center of Gravity:
The center of gravity placement may or may not fall inside the CG Area. If it doesn't then the balance hole location may need to be adjusted.
Mass Bias Placement:
Place Mass Bias at a 45 degree angle to the right of the thumb hole. If needed place balance hole over on the Vertical Axis Line and 2 inches down and drill back to negative side weight. The bigger and deeper the hole is the more increased ball reaction. Remember to keep the ball statically legal.

Layout 3

Drilling Layout for Layout 3
This is the recommended layout for most players that have known axis measurements.
This layout produces the most even reaction with the highest total hook.
Ball Reaction:
Early and Strong
Suitable for:
High Ball Speed, Low RPM, Heavy oiled lanes
Flare Potential:
Very Large
Pin Placement:
Place Pin 3 1/2 inches from PAP
Center of Gravity:
The center of gravity placement may or may not fall inside the CG Area.If it doesn't then the balance hole location may need to be adjusted.
Mass Bias Placement:
Place Mass Bias in line with the Pin. If needed place balance hole over on the PAP and drill back to statically legal.

Layout 4

Drilling Layout for Layout 4
This is the recommended layout for All Full Rollers
Ball Reaction:
Strong Arc
Suitable for:
Most Styles and Lines
Flare potential:
Large
Pin Placement:
Place Pin 3 1/2 inches from bowlers center of span in an 8:00 direction
Center of Gravity:
The center of gravity placement may or may not fall inside the CG Area. If it doesn't then the balance hole location may need to be adjusted.
Mass Bias Placement:
Place Mass Bias at a 2:00 direction from the center of span. If needed place balance holes 8 inches from the center of span in a 2:00 direction to remove excess positive side weight. Place balance hole 6 inches from the center of span in a 8:00 direction to remove excess negative side weight.

Layout 5

Drilling Layout for Layout 5
This is NOT A RECOMMENDED LAYOUT.
This layout will produce a very mild ball reaction and is not recommended.
Ball Reaction:
Very mild
Suitable for:
Extremely high rev rates
Flare potential:
Very Small
Pin Placement:
Not recommended with this layout
Mass Bias Placement:
Mass Bias Placements to the left of the thumb hole are not recommended because of the severe reduction in flare potential.

Frequently Asked Questions

�I cannot drill Ebonite�s factory recommended layout #1 with a 0-1 or 1-2� pin�
�I need to have the CG in line with the Pin and Mass Bias�
�This X-Out that I received has the CG on the other side of the pin. This ball is un-drillable!!!!�
�My ball does not hook as much as expected!!!�

Answer: Yes, you certainly can. With short pins, you are looking to remove the amount of static finger weight in order to be compliant with USBC regulations. We suggest that you drill your finger holes deeper than normal, deep enough to be compliant with USBC guidelines. Also, balance hole placement is important to consider when trying to have a ball comply with USBC static weight guidelines. You can position a balance hole to accomplish finger weight removal as well as side weight removal. It is important to note that the Centrex Symmetric Mass Bias Core was designed to be drilled into. You will not alter ball motion drastically by executing these suggestions.

Ball Reaction:
Long and Strong
Suitable for:
Most Styles
Flare Potential:
Medium
Center of Gravity:
As the CG area will fall close to the finger area, and perhaps above the fingers, drill fingers deeper than normal to remove the appropriate finger weight.
Balance Hole:
A balance hole may be required in order to remove the necessary finger weight. Position the hole accordingly.
FAQ 1 Image

Answer: No, that is not the case. Place the Pin and Mass Bias in the desired locations for the bowler. After drilling the ball, determine if a balance hole is required, and where you might like to place it. For example, if the CG is off line to the right (for a Right Hand Bowler) you may have to place a balance hole to the right along the Center line. We generally recommend that you place this hole over 4 inches and up 1/2 inch. The depth of the hole and size of the bit will be determined by the amount of weight you desire to remove. We will show 2 illustrations. 2A will be if the CG area is off to the right of center, and 2B will show the CG area off to the left. In the case of the CG off to the left, the CG will most likely end up in the grip area, thus, no balance hole required.

Ball Reaction:
Long and Strong
Suitable for:
Most Styles
Flare Potential:
Medium
Center of Gravity:
Not in Line with the Pin and Mass Bias.
Mass Bias Placement:
Place Mass Bias 3 inches to the right of the thumb hole.MB-CG AREA Balance Hole Area
Balance Hole In illustration 2A:
Place hole in the prescribed area in order to have the ball meet USBC specifications. You may need to drill deep with a large bit if the top weight was excessive.
Balance Hole In illustration 2B:
No Balance hole would be required.
FAQ 2 Image

Answer: This ball is certainly drillable. Repeat step # 1, and place the weight hole (it may be a large one) in the location that will remove the necessary weight (Above finger for example). In this case, it is also suggested that you drill the finger holes deep as well.

Answer: The effects of sanding the One & NV Series are extreme. As stated in the One & NV Series seminar presentation, GB 10.7 is in fact, the strongest cover in bowling today. That is why we have been able to release a ball that has such a smooth surface (4000 Grit Abralon) with a High polish (Ebonite Powerhouse Factory Finish Ball Polish). By sanding the One & NV Series, you can increase the overall hook by quite a bit.

No Limit Drilling Layouts

Note: All drilling layouts are for right-handed bowlers, reverse the images for left-handed bowlers.

Layout 1

Premier Layout #1
Ball Reaction:
Long & Strong
Suitable for:
Most styles and target lanes
Flare potential:
Medium High
Center of Gravity:
The center of gravity placement may or may not fall inside the CG area. If it does not, then the balance hole location may need to be adjusted.
Mass Bias Placement:
Place Mass Bias 3 inches to the right of the thumb hole. If needed, place balance hole 4 inches over and 1/2" up and drill back to statically legal.
Mass Bias Placement for HIGH REV PLAYERS:
For players that have RPM rates of 350 and greater, you need to place the Mass Bias Location in the 70 to 90 degree location.

Layout 2

Preimier Series Layout #2
Ball Reaction:
Long & Strong
Suitable for:
Most styles
Flare potential:
High
Center of Gravity:
The center of gravity placement may or may not fall inside the CG area. If it does not, then the balance hole location may need to be adjusted.
Mass Bias Placement:
Place Mass Bias at a 45 degree angle to the right of the thumb hole. If needed, place the balance hole over on the Vertical Axis Line and 2 inches down and drill back to negative side weight. The bigger and deeper the hole is, the stronger the ball reaction will be. Remember to keep the ball statically legal.
Mass Bias Placement for HIGH REV PLAYERS:
For players that have RPM rates of 350 and greater, you need to place the Mass Bias Location in the 70 to 90 degree location.

Layout 3

Premier Series Layout #3
Ball Reaction:
Early & Strong
Suitable for:
High Ball Speed, Low RPM, Heavy Oil Patterns
Flare potential:
Very High
Center of Gravity:
The center of gravity placement may or may not fall inside the CG area. If it does not, then the balance hole location may need to be adjusted.
Mass Bias Placement:
Place Mass Bias in line with the pin. If needed, place balance hole over on the PAP and drill back to statically legal.
Mass Bias Placement for HIGH REV PLAYERS:
For players that have RPM rates of 350 and greater, you need to place the Mass Bias Location in the 70 to 90 degree location.

Layout 4

Premier Series Layout #4
Ball Reaction:
Strong Arc
Suitable for:
Full Rollers
Flare potential:
Large
Center of Gravity:
The center of gravity placement may or may not fall inside the CG area. If it does not, then the balance hole location may need to be adjusted.
Mass Bias Placement:
Place Mass Bias at a 2:00 direction from the center of span. If needed, place balance hole 8 inches from the center of span in a 2:00 direction to remove excess positive side weight. Place balance hole 6 inches from the center of span in a 8:00 direction to remove excess negative side weight.

Symmetrical Drilling Layouts & Instructions.

Note: All drilling layouts are for right-handed bowlers, reverse images for left-handed bowlers.
The heavy spot of the ball (center of gravity) is signified by the letters CG in the drilling instructions. The center of the core is identified by the PIN. The PAP in the layouts is the bowler's positive axis point. If the bowler's PAP is not known, we suggest Layout 1, placing the CG in the center of span.

Label Leverage

Symmetrical Layout 1
Hook Style:
medium hook, arc backend
Lane Condition:
Medium to heavy oil with a hooking track, fresher backends, great for slower ball speeds and minimal axis rotation.

12:00 LEVERAGE

Symmetrical Layout 2
Hook Style:
maximum hook, sharp breakpoint
Lane Condition:
Medium to heavy oil blend, open up the lane.

REV LEVERAGE

Symmetrical Layout 3
Hook Style:
large hook, controlled backend
Lane Condition:
Medium to heavy oil with carrydown, good for players with low tracks, maximum axis rotation, and faster ball speeds.

AXIS LEVERAGE

Symmetrical Layout 4
Hook Style:
medium hook, controlled backend
Lane Condition:
Medium to heavy oil with fresher backends or spotty backends where predictable hook is most important.

MEDIUM RG - STRONG

Symmetrical Layout 5
Hook Style:
large hook, sharp backend
Lane Condition:
Medium oil with carrydown, plays well inside of a defined oil line, great for medium to maximum axis rotation and above average ball speed.

MEDIUM RG - ARC

Symmetrical Layout 6
Hook Style:
small to medium hook, arc
Lane Condition:
Light to medium oil with hooking ball track, wet/dry conditions, great for players with slower ball speed, minimal axis rotation, or stronger revs.

HIGH RG - ARC

Symmetrical Layout 1
Hook Style:
small to medium hook, late revs, arc
Lane Condition:
Light oil with hooking ball track, dry conditions, great for players with slower ball speed, minimal axis rotation, or stronger revs.

HIGH RG - STRONG

Symmetrical Layout 8
Hook Style:
small to medium hook, late revs, sharp backend
Lane Condition:
Lighter oil with carrydown, great for players with slower ball speed, medium axis rotation, or stronger revs.

LOW RG - ARC

Symmetrical Layout 9
Hook Style:
small to medium hook, early revs, arc backend
Lane Condition:
Lighter oil, wet/dry conditions.

LOW RG - STRONG

Symmetrical Layout 10
Hook Style:
small to medium hook, early revs, strong arc backend
Lane Condition:
Light to medium oil, wet/dry conditions, lower track players, faster speed, medium to maximum axis rotation.

Full Roller

Symmetrical Layout 11
Reaction:
3 3/8" from grip center
Lane Condition:
Medium to heavy oil, maximum hook
Reaction:
1 1/2" from grip center
Lane Condition:
Medium oil with carrydown.

Three Peice Core Layouts & Information

Factoring the PAP

Depending on your PAP measurements, the CG may be further away or closer to the center of span than is illustrated. The important factor is its distance from the PAP, not the relationship of the CG to the center of the span.

This drilling layout is for right-handed bowlers, reverse image for left-handed bowler.

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.

<div class="leftCol3">

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.

CG Locations

Optyx Polyester Balls
Between the lower legs of the X
Maxims
Center of bullseye
Gyro Series
Center of bullseye
Bud Ball
Center of bullseye
Yankee Doodle
Center of "swish" above the Ebonite
Hustler Balls
Center of bullseye
Quasar
Center of bullseye located 90 degrees from Ebonite "swish" on the colored stripe
Shamrock
Center of bullseye
Tornado Warning
Center of bullseye
Garfield & Odie Balls
Center of bullseye

3-Piece Core Layout

Three Piece Core Layout 1
Ball Choice:
All top weight
Reaction:
Delayed breakpoint, moderate backend on light to medium oil Suitable for.