Basically the balls were revoked because the Differential was over the limit by 4 thousandths of a inch (about the thickness of a razor blade)Originally Posted by fordman1
Thanks 1820 . I still don't understand but I am sure aslan will explain.
Basically the balls were revoked because the Differential was over the limit by 4 thousandths of a inch (about the thickness of a razor blade)
Right handed Stroker, high track ,about 13 degree axis tilt. PAP is located 5 9/16” over 1 3/4” up.Speed ave. about 14 mph at the pins. Medium rev’s.High Game 300, High series 798
"Talent without training is nothing." Luke Skywalker
Conceptually think of a bowling ball made of many small BB sized pieces of ball material.
The BB's that represent the core would be the most dense, then the coverstock, and finally the filler.
Now one by one pick each of these BB's, weight it to determine the density, and calculate how far from the axis it is located.
Kind of like how far the tire is from the axle, except since the ball is solid, you will have all distances from 0 to 4.277"
If you repositioned all the BBs at the same distance, to achieve the same sum as the solid ball, that distance from the axis is the RG.
The measuring process doesn't cut the ball into BB's obviously so they work the math in reverse.
The ball twisting much like if you sit in a swing and twist clockwise, when you pick for feet up, you swing counter clockwise.
How long it takes to swing one way, then back is directly related to the RG of the object being swung.
So by timing the swing, they can calculate what the RG must be to achieve that rate.
Thanks gentlemen now I am positive it is silly. Actually that is about the same amount of room I have on the lanes this year.
4 thousandths of a inch.
That was just the average on the orginal Jackal. Jackal Carnage was average .016(or .012 I forget) width of 4 razorblades.
Regardless if someone thinks this is silly, there are guidelines the ball manufacturers agreed to go by when the USBC came up with them.
High Sanctioned Scratch Game - 300(12) Hi Sanctioned Scratch Series - 822(3)
2016/17 Book Average=221, 2017/18 Composite Average=223
Equipment in the bag - Storm Crux Prime, Storm Physix, Roto Grip Idol, Roto Grip Idol Pearl, Roto Grip Hyper Cell Fused, Storm Sure Lock, Storm Drive, Roto Grip Winner Solid, Roto Grip Haywire, Storm Fever Pitch, Roto Grip Red ball spare.
Rev Rate 400. Speed 18 at heads, 16.5-17 at pins. Axis tilt 10, Axis Rotation 55. PAP 5 5/8 x 5/8 up
The other way aroundThat was just the average on the orginal Jackal. Jackal Carnage was average .016(or .012 I forget) width of 4 razorblades.
Of the purchased samples the average diff. for the Jackal Carnage was .0604 (4 Ten thousandths over the .060 limit).
And for the org. Jackal the average diff. was .0616, so .0016 over.
Last edited by bowl1820; 04-01-2016 at 12:02 PM. Reason: update to ten thousandths
Right handed Stroker, high track ,about 13 degree axis tilt. PAP is located 5 9/16” over 1 3/4” up.Speed ave. about 14 mph at the pins. Medium rev’s.High Game 300, High series 798
"Talent without training is nothing." Luke Skywalker
Maybe I am confused but isn't .0604 over four / ten-thousandth? Tenths - hundredths - thousandths - ten thousandth.
Yep your right! Everyones had it wrong in all the posts. Good catch
Right handed Stroker, high track ,about 13 degree axis tilt. PAP is located 5 9/16” over 1 3/4” up.Speed ave. about 14 mph at the pins. Medium rev’s.High Game 300, High series 798
"Talent without training is nothing." Luke Skywalker
Go back and check your facts.
I "attack" the arguments.
His responses are "You're a stalker", "You really have it out for me", and my favorite, "Well that's what someone else told me".
1820 Ya even a blind squirrel finds a nut sometimes.
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