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Understanding Bowling Ball Balance Holes

Understanding bowling ball balance holes is a step in learning options your ball driller has when selecting a drilling layout.
Here are a few bullet points about a balance hole:

A balance hole is an extra hole (weight hole) in a ball which ensures the ball remains within United State Bowling Congress (USBC) specifications and guidelines for imbalance (static balance).

The maximum allowable diameter is 1-1/4" for USBC sanctioned play.
Balance holes in bowling balls are non-gripping holes drilled into the ball.
Balance holes adjust the static weight of a given ball and create dynamic influence.
The effect of static weights is extremely minimal on the ball's reaction.

The key influence of a balance hole lies in the effects that it has on the ball while it is in motion.
The location of a balance hole with regard to the distance from the pin is the primary tool for altering the dynamics of the ball's core.

The USBC states that a bowling ball may have no more than one (1) ounce of side weight after the holes are drilled.
If a ball is over one (1) ounce (we recommend 3/4 ounce) then there is a guide pro shop professionals use to help determine what size drill bit you should use, and how deep a balance hole should be drilled to restore the ball to specification limits.

Use of a balance hole would be the final factor important in achieving a desired ball reaction.
The drilling technique when using a balance hole consists of the layout and the balance hole size and location of the hole.

Drilling a balance hole can help to control the degree of transition your ball makes in the mid-lane and at the break point down the lane.