3. two fingers, one thumb *unless ball has a balance, or weight hole to make the ball USBC legal.
yes
There is usually 3 holes in a Ten Pin Bowling Ball. 1 large hole for your thumb and 2 smaller holes for your middle and ring finger. Some bowlers may have different numbers of holes based on their bowling style.
bowling
Start by drilling a round "pilot" hole, then shape it with an end mill.
3
3
a bowling ball
3 holes in a bowling ball
In tenpin bowling, bowlers who are having difficulty with release, usually related to the ball sticking on the thumb, will sometimes have a very small hole drilled just below the thumb hole, at angle that enters into the lower part of the thumb hole. This is to allow air into the lower region of the thumb hole and prevent a vacuum from taking hold.
u can have up to five (one for each finger) but most balls have 3-4 holes. one for thumb, one for middle finger, one for ring finger, and for higher preformance bowling balls, they usually have a counterweight hole so that it balances the ball ass it rolls down the lane.
For a tenpin bowling ball, the radius is 4.25 inches (10.8 centimeters).