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Author Topic: weight hole in mb  (Read 2127 times)

J_w73

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weight hole in mb
« on: December 02, 2008, 02:49:55 PM »
Ok.. I have read putting a weight hole on the MB enhances the dynamics of the ball.. I think that means increases flare.. ok .. makes sense. weight directly out of the side of the core (at 6 3/4inches) increases the diff.. more diff.. more flare..ok

but why directly on the mb... why not 6 3/4 from the pin to the side of the mb..
why would you want to drill out the mass bias... Isn't that defeating the purpose of having an assymetrical ball mb ball??
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bluerrpilot

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Re: weight hole in mb
« Reply #1 on: December 02, 2008, 11:14:30 PM »
quote:

why would you want to drill out the mass bias... Isn't that defeating the purpose of having an assymetrical ball mb ball??


First ask yourself, what is the purpose of the MB. The answer would be to create more imbalance because the "mass" is more "biased" in the direction of the core shift. Adding a void there only increase this imbalance further.
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Edited on 12/3/2008 0:14 AM
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J_w73

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Re: weight hole in mb
« Reply #2 on: December 03, 2008, 01:06:02 AM »
Maybe I am wrong .. but isn't the mass bias usually protruding out from the core toward the outer surface of the ball..
so if the mass bias is protruding why would you eliminate it by drilling it out..
why not put a void next to the protrusion.. that would create a larger imbalance wouldn't it ???
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bluerrpilot

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Re: weight hole in mb
« Reply #3 on: December 03, 2008, 02:02:42 AM »
The mass bias in a bowling ball occurs when the mass of the core or portion of the core is biased in one direction inside the ball.


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J_w73

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Re: weight hole in mb
« Reply #4 on: December 03, 2008, 02:25:00 AM »
quote:
The mass bias in a bowling ball occurs when the mass of the core or portion of the core is biased in one direction inside the ball.


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"USBC is concerned that technology has overtaken player skill in determining success in the sport of bowling"


exactly.. the mb mark is usually the point were the core is biased.. so drilling on the mb is drilling out the bias...
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J_w73

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Re: weight hole in mb
« Reply #5 on: December 03, 2008, 09:28:35 AM »
quote:
quote:
Maybe I am wrong .. but isn't the mass bias usually protruding out from the core toward the outer surface of the ball..
so if the mass bias is protruding why would you eliminate it by drilling it out..
why not put a void next to the protrusion.. that would create a larger imbalance wouldn't it ???


Mb is a misused term for PSA (high Rg axis) on an asymmetric cored ball. Your impression that additional mass is located at this point is incorrect, there is less mass this is why drilling a hole and removing additional mass in this area increases dynamics.

you may be 100% correct but this isn't the case in some balls.. I will state the AMB cores from visionary.. They have a super light cap opposite where you find the mass bias.. (they call it the anti mass bias).. 13.5 from this point is the mass bias..therefore making that area denser.

do you have an article explaining your version of the mb??

anyone else support this


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Edited on 12/3/2008 10:29 AM
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Dan Belcher

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Re: weight hole in mb
« Reply #6 on: December 03, 2008, 09:31:14 AM »
According to Storm's website, the mass bias is "The position in a bowling ball, other than the pin, where the mass is closest to the outside circumference of a bowling ball. Mass Bias appears only in "pin out" balls or high perfomance balls designed with a specific Mass Bias. This is typically the highest RG location of the ball and also have a great effect on the PSA of a ball."
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srlunatic

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Re: weight hole in mb
« Reply #7 on: December 03, 2008, 09:38:33 AM »
Check out MoRich's Gradient Line Balance Hole Drill...

https://www.morichbowling.com/MosCorner/GradientLineBalanceHole/GradientLineBalanceHole.htm

Should answer your question...
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J_w73

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Re: weight hole in mb
« Reply #8 on: December 03, 2008, 09:49:17 AM »
quote:
Check out MoRich's Gradient Line Balance Hole Drill...

https://www.morichbowling.com/MosCorner/GradientLineBalanceHole/GradientLineBalanceHole.htm

Should answer your question...
--------------------
“Every now and then when your life gets complicated and the weasels start closing in, the only cure is to load up on heinous chemicals and then drive like a b@$tard from Hollywood to Las Vegas ... with the music at top volume and at least a pint of ether.”


read it.. I don't believe it entirely.. I believe it is the distance from the pin that effects how much diff and flare is created.. that is why on the mb does increase the diff and the flare.. it is 6 3/4 from the pin.. right in the side of the core..
notice on mo's article.. on the shorter pin to pap balls that p1 to p4 is a big difference.. cause you are putting a hole at 2 to 3 inches on p1 and 6 3/4 at p4.. look at the 5 inch pin to pap... not as big of spread on the diff changes.. cause you are putting a hole at 5 inches on p1 and at 6 3/4 on p4..

check out this article from Ebonite.. sounds logical to me..

http://ebonite.com/resources/bowling_tip_detail/balance_holes



Edited on 12/3/2008 11:19 AM
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J_w73

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Re: weight hole in mb
« Reply #9 on: December 03, 2008, 09:51:18 AM »
quote:
According to Storm's website, the mass bias is "The position in a bowling ball, other than the pin, where the mass is closest to the outside circumference of a bowling ball. Mass Bias appears only in "pin out" balls or high perfomance balls designed with a specific Mass Bias. This is typically the highest RG location of the ball and also have a great effect on the PSA of a ball."


ok.. that sounds like it is protruding and there is more mass at that point.
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J_w73

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Re: weight hole in mb
« Reply #10 on: December 03, 2008, 10:01:41 AM »
quote:
quote:
Maybe I am wrong .. but isn't the mass bias usually protruding out from the core toward the outer surface of the ball..
so if the mass bias is protruding why would you eliminate it by drilling it out..
why not put a void next to the protrusion.. that would create a larger imbalance wouldn't it ???


Mb is a misused term for PSA (high Rg axis) on an asymmetric cored ball. Your impression that additional mass is located at this point is incorrect, there is less mass this is why drilling a hole and removing additional mass in this area increases dynamics.


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Precision


I understand that it is the PSA .. but usually there is increased mass to make the high rg in that position
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J_w73

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Re: weight hole in mb
« Reply #11 on: December 03, 2008, 02:19:35 PM »
quote:
quote:
Maybe I am wrong .. but isn't the mass bias usually protruding out from the core toward the outer surface of the ball..
so if the mass bias is protruding why would you eliminate it by drilling it out..
why not put a void next to the protrusion.. that would create a larger imbalance wouldn't it ???


Mb is a misused term for PSA (high Rg axis) on an asymmetric cored ball. Your impression that additional mass is located at this point is incorrect, there is less mass this is why drilling a hole and removing additional mass in this area increases dynamics.


--------------------
Precision


Talking with a Rotogrip technical guy via email and he is confirming what you are saying.. it isn't making sense to me though..especially when alot of ball companies explain it the opposite way..
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J_w73

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Re: weight hole in mb
« Reply #12 on: December 04, 2008, 11:57:05 AM »
quote:
quote:
quote:
According to Storm's website, the mass bias is "The position in a bowling ball, other than the pin, where the mass is closest to the outside circumference of a bowling ball. Mass Bias appears only in "pin out" balls or high performance balls designed with a specific Mass Bias. This is typically the highest RG location of the ball and also have a great effect on the PSA of a ball."


ok.. that sounds like it is protruding and there is more mass at that point.


Storm's statement is accurate. You're just not thinking 3 dimensionally, if additional mass in located along one side of the core the axis it rotates about is 90 degrees from that point. This 90 degree point is the PSA (high Rg axis).

If you still can't visualize this, message me your E-Mail and I'll send you a diagram which might help.
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makes sense.. so the MB or PSA mark on the balls is the axis.. and the "actual" mass is 90 deg from that ??

I'll leave it at that.. but depending on your answer I will have more questions
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