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Author Topic: I got me some Kaufman Scales and I know how to weight out a ball... BUT...  (Read 2274 times)

Ric Clint

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...how do I find the CG on an UNDRILLED ball? I've read the page on LANE #1 website... but I don't understand it (or for some reason it's just not registering in my mind).

Can someone tell me in a way to help simplify things so I can figure it out?




 

Traumatize

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I had the same problem when trying to use Lane 1's method.  Just read it over ONE STEP AT A TIME, and it will click.  Take your time, and don't look ahead.
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azguy

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It's 4 am, so keep that in mind...

It took me about 25 min to do this, the one thing I had to do, looking at the printed page, was mentally throw out the "Lane 1" logo, that was throwing me off and just read...don't look at the pictures. When I did this, and looked at the picture of the label, it confused me about ...'center of label', just do one step at a time, I found the ball I used was off less than the mark width, not to bad for 4 am. maybe next time i'll use a sharper pencil, that might have throw it off a hair.

Good Luck.
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Ric Clint

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Here's the steps:


1. Start with an un-drilled ball, draw a line through the label, centering that line with the quarter scale. (fig. 1)

2. Balance scale until it reads zero.

3. Rotate ball 90 degrees. (fig. 2)

4. Shift ball left or right, until the scale balances.

5. Center quarter scale on ball and draw a perpendicular line intersecting previous line. (fig. 3)

6. Rotate ball 90 degrees. (fig. 4)

7. Shift ball left or right, until the scale balances.

8.Center quarter scale on ball and draw a perpendicular line intersecting previous line. (fig. 5)

9. Rotate ball 90 degrees. (fig. 6)

10. Shift ball left or right, until the scale balances.

11. Center quarter scale on ball and draw a perpendicular line intersecting previous line. (fig. 7)

12. Connect corners of box. (fig. 8)

13. X Marks the center of gravity.





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In #2, what does that mean? Balance the weights until it measures 0, or just try to get the "meter" (or whatever it's called) on the right side to balance it self out and be "even"?




JohnP

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Ric -- In step 1, the ball is in the scale with the line you've drawn centered and oriented perpendicular to the longer direction of the scale (see the picture in the Lane 1 instructions).  In step 2, you set the small sliding weight adjustment (the one used to get side weight, top weight, etc.) to zero.  Add or remove the hanging weights as needed and slide the large sliding weight as needed to balance the scale (just as you do when getting a gross weight on the ball).  Now from this point on, you do not adjust the hanging or sliding weights further (in fact, you need to be very careful that they do not move when you rotate and shift the ball), just draw the lines and rotate, then shift the ball per the instructions.  You always rotate the ball counterclockwise, then shift it either right or left to rebalance the scale. This is another of those things that's easier to do than to explain.  --  JohnP

Ric Clint

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Does it matter how close/far the first line is from the CG marking on the actual ball as a starting reference point?




JohnP

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Not really, but I usually make it about 1 - 2" away.  That makes a fairly good sized "rectangle" at the end.  By the way, one other thing that might help you - when you look at the Lane 1 drawings, they are oriented as if the ball is in the scale cradle and you are looking down on it.  --  JohnP