Bowling ball thumb hole tool

Shammies Towels See-Saws. Bowling Pins. No reviews yet Write a Review. Current Stock:. Quantity: Decrease Quantity: Increase Quantity:. Adding to cart… category. Facebook Email Print Twitter Pinterest. Product Description Master's Perfect Fit tool combines 3 tools into 1 device. The workout tool gives you the ability to open the hole from bottom to top with consistency.

For a right-handed bowler, the area on the right half of the mid-plane MP is called the positive side of the ball b, while the area on the left side of the mid-plane MP is called the negative side of the ball B. In the case where a consistent bowler uses the same bowling ball for a length of time, a distinguishing wear pattern called a ball track 20 will begin to appear. Because the ball B is spinning as it leaves the bowler's hand, and because lanes are generally oiled, the ball B tends to slide along the lane for a length of time before friction between the ball B and the.

The sliding of the ball B relative to the lane, causes the weave marks known as the ball track The width of the ball track 20 can vary due to factors such as the consistency of the bowler and the dynamic stability of the bowling ball B. For discussion purposes, the ball track 20 can be considered as being in a plane which is centered in the middle of the ball track Perpendicular to the plane containing the ball track 20 is a line called the spin axis SA.

When the ball B is spinning and sliding down the lane, it revolves around the spin axis SA. The dynamics of the motion of a bowling ball B as it travels down the bowling alley lane is described in FIGS.

When the ball B is delivered from the bowler's hand, the ball is spinning about the spin axis SA and sliding down the lane Just after the ball B leaves the bowler's hand, it is usually not yet rolling. At some point down the lane 22, the ball's motion begins to change from spinning and sliding to rolling. During-this time of transition, the bowling ball is revolving about two axes simultaneously and is subject to the physical phenomenon of precession.

With continuing reference to FIGS. The first axis, denoted SA, is the spin axis of the bowling ball B. The second axis, denoted R, passes through the center of the bowling ball and is parallel to the lane surface. This is the axis about which the bowling ball revolves as it rolls.

The third axis, denoted V, is a vertical axis passing through the center of the bowling ball which is perpendicular to the rolling axis R. Weighing a Bowling Ball. The American Bowling Congress has published general instructions for weighing and balancing bowling balls on a beam scale. In summary, the American Bowling Congress requires that a static beam balance scale be used for weighing and measuring the center of gravity CG shift in bowling balls.

A non-uniform distribution of weight can cause a bowling ball to have a different apparent weight when weighed in different positions. With reference to FIG. The beam scale 38 features a spherical cradle 40 for holding the bowling ball B in a fixed position relative to the pivot axis 42 of the scale The ball B is placed in the spherical cradle 40 and weighed. Next, the ball B is turned within the spherical cradle 40 and a second weight reading is observed. If the exterior of the ball is reasonably spherical in shape, the difference between the first weighing and the second is the shift in the center of gravity CG for the two weighing positions.

With reference to FIGS. In FIG. By using an air bearing or by floating the ball B in a liquid, a heavy side of the ball B can be determined if the center of gravity CG of the ball is offset from its geometric center C.

In such case, the ball can be placed on the scale with the center of gravity CG in the top position. The scale is then balanced using the weight poise 46 and the balance poise 48 set to zero. The balance poise 48 is moved to the right, as seen in FIG. This step called "weighing the top of the ball," gives an estimate of the shift of the ball's center of gravity CG in terms of an artificial weight, which depends on the physical dimension of the scale.

L B equals the distance between the geometric center of the ball and the pivot axis L P equals a distance between the centroid of the weight poise 46 and the pivot axis L F equals the distance between the centroid of the balance poise 48 and the pivot axis This process is known as weighing the "bottom of the ball" and requires that the balance poise 48 be shifted to the left from the initial zero position Bowling balls are typically described as having six sides.

The positive side of the ball B is the side which hits the head pin first. This process is much better than the bevel sander as it removes much less material.

It's far too easy to remove too much material. You got that right! I used to tell my driller that the hole needed to be opened up, that it was rubbing on the inside of my thumb and he'd give it back to me so big that I'd need to use about 4 pieces of tape to adjust! I found it was easier to just buy the tools and do it myself - rasp, workout tool, bevel knife, and sander.

Of course I also bought a drill and everything else! It also makes a huge difference on whether the sander has a new disc or not. I've hit a thumb hole with a new disc and in just a few seconds opened it up too much where I had to just remove the slug and start over.

Fit in thumb is good. Combination of a move to an area with higher humidity and bare minimum AC in all of the centers around here. Weaser Hero Member Posts: My driller ships my equipment with the oval thumb a half size too small as far as length goes.

I use grit dry wall sanding screen cut in 1" x 3" long strips to work out the urethane slug without vent holes. I bought a workout tool, but sold it because it left ridges in the slug if substantial material was to be removed.

I've never tried either one. I guess since they are adding additional size to your thumb, they would probably require you to open your thumb hole anyway. Or you could always try rubbing some chapstick on the parts that are sticking - have read that it can help.