Hi Everybody
I am trying to familiarize myself with the procedures of weighing a bowling ball on a Kaufman scale, such as top weight, side weight, and weight of ball.
When determining the gross weight on the bowling ball you have to rotate the ball 180 degrees in the Kaufman cradle. I have the center line marked and a quarter scale. Do most of you place hash makes on your Kaufman cradle so you can rotate the ball 180 degrees from the previous ball postion? If so how did you mark your Kaufman cradle?
Thanks
Mike
Determining Gross Weight on Bowling Ball
Position #1: Determine Gross Weight by placing the ball in the scale as in sketch “A†and Position #1, with the thumb hole towards the weigher, the holes to be centered on a line from front to back. Place the poise (sliding weight on front beam) at zero, the poise (sliding weight on rear beam) is adjusted to obtain the gross weight. The poise on the front beam must be at zero to obtain gross weight. If the right and left sides of the ball are in perfect balance the gross weight from this test is the accurate gross weight.
Position #2: Proving Weight and weighing right side of ball:
1. Rotate the ball 180 degrees as illustrated in Position 2 with the finger holes toward the weigher and centered on a line from back to front.
2. If the scale is not in balance, the poise on the front beam should be moved accordingly until the scale balances.
3. If the front beam poise is moved one/half ounce to the right, for example, this signals that the right side of the ball is one-half ounce heavier than the left side. It also signals that the ball weighs slightly more than the result obtained in test #1
4. Since there was a difference of one-half ounce between test 1 and 2, the gross weight equals the total of the weight determined in position 1 plus one-half the difference between the tests. In this example, one-fourth of an ounce more than the weight determined in position 1.
To double check the weight an accurate gross weight scale should be used.
If a gross weight is not available or if either test 1 or test 2 shows the ball to be slightly over 16 pounds, the ball may be passed, provided one-half the difference does not bring the weight over 16 pounds and it balances in conformity with ABC/WIBC specifications. Let us assume in test 1 the ball weighed 15 pounds, 15 3/4 ounces, while in test 2 it weighed 16 pounds 1/4 ounce. Taking one half of 1/2 ounce, or 1/4 ounce and adding it to 15 pounds, 15 3/4 ounces would total 16 pounds and the ball would be acceptable providing it is otherwise within balance limits. The allowable difference between the left and right side of the ball shall not exceed one ounce.
