Placement, Center of Gravity, and the weight block
When a bowling
ball is built, the core of the ball is anchored by a small rod and
is suspended in a mold when the cover stock is poured into the mold.
When the cover stock material hardens and the bowling ball is removed
from the mold, the rod that was holding the core of the ball in
the mold is removed. At this point there is a hole in the ball that
has to be filled in, it is filled with plug material. This plug
looks like a dot on the surface of the bowling ball is known as
the "pin". The pin signifies the position of the top of
the core in the bowling ball.
As the cores
of the modern-day resin urethane balls became so strong, and as
our understanding of the core's influence on the motion of the ball
advanced, it became important for bowling ball manufacturers to
color the plug so we could see what we were dealing with. Today
there is no high-performance bowling ball that doesn't identify
where the core is and how far it is from the center of gravity.
The center of gravity is marked by a small punch mark on the surface
of the bowling ball. The position of the center of gravity relative
to the pin location determines how a ball is drilled for the reaction
that the bowler is trying to get. Because of today's high tech bowling
balls and specially designed weight blocks, the ball driller needs
to know where the core is located in the bowling ball.
high-performance bowling ball labels are located near the pin and
the center of gravity. They are all located away from the drilling
area, so the ball driller can clearly see the center of gravity
and the pin. Only the plastic balls and the lower-priced resin and
urethanes still put the label over the center of gravity. Only the
plastic and urethane balls with a pancake-style weight block still
cover this area. Most of the companies build their cheap balls with
no regard to where the pin is, and they color-coordinate the plug
to the ball. But they still mark where the center of gravity is
by putting the label above it.
bowler will pick out preferred drillings based on what is felt will
work for them. It takes knowledge of the bowling ball's construction.
This also requires of how the core and cover stock influence each
other and axis coordinates to help decide the drillings.
have bowlers with equal talent that are bowling equally well, the
player with the better ball reaction will win. The professional
bowler looks at the lane condition and the type of ball reaction
they're getting. If they're not getting a good reaction they start
thinking about what piece of equipment and drilling configuration
will help them get the reaction they need to help maximize their
professional bowlers will look for is the right type of ball movement
for the condition they're playing on. If you're bowling right after
the lanes are stripped and oiled, you will have a lot of front-end
skid and strong back ends, the ball will automatically slide down
the lane and finish hard without a lot of effort from the bowling
ball or the bowler. On this condition, you need to have the ball
set up to have a controlled movement. You don't need a "skid long,
flip hard" type of drilling and surface.
late in the day after a lot of bowling, the heads will be hooking
early and the back ends will be tight because of lane oil carrydown.
The shot will have moved deep, so you'll need a ball that goes long
and finishes hard. During any day you may encounter many different
ball reactions between those two extremes.
ball companies maintain staffs of players on both pro tours, and
they also have ball reps out on the tour with the players. The bowling
ball rep's will watch the ball reaction as bowlers use his company's
balls; when a player requests assistance from the ball rep, he will
watch the player to make some recommendations about equipment to
use. The ball rep will act as a consultant and sometimes as a coach.
to fully understand what's going on, even the pros who bowl every
day need a set of knowledgeable eyes watching their execution and
how the ball is reacting to the condition, sometimes it's difficult
to determine whether you're throwing the ball properly or not. With
the combination of lane conditions and everyone's individual game,
it can get very confusing selecting the right ball and proper drilling.