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Author Topic: Help me make sense out of this...  (Read 1275 times)

JessN16

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Help me make sense out of this...
« on: June 30, 2009, 11:23:07 AM »
First of all, pull up a picture of 900Global's Link bowling ball. Note that the core is shaped like an "L."

Now, think about this. You're righthanded. You have bought a Link, and the pin, CG and MB are all directly in a straight line. You drill the ball straight up -- pin over bridge, CG in the palm, MB below the thumb.

Assuming we're looking at the pic of that core from the pins' perspective, the top of the "L" is the pin on the ball. The bottom of the "L" points to the right, towards the bowler. Ergo, it is also pointing towards the pocket.

Now, assume you were lefthanded and drill the ball the same way. Remember that the pin, CG and MB are all in a straight line.

From the pins' perspective, though, the bottom of the "L" is now pointing AWAY from the bowler, not towards him. Ergo, it is also pointing AWAY from the pocket.

To get the core to be "equal" for both bowlers, would we not have to flip the core around and pour another ball? This has been done in the past -- the old JPF Axe was ordered from the factory in either right- or left-handed alignments. I suppose you could turn the ball around 180 degrees and drill it, but that would put the MB marker and CG on the other side of the ball and do who-knows-what to static weights for legality purposes.

Unless there's something very simple I'm not seeing here, it appears that many asymmetrical balls can't be drilled to be "equal" for right- and left-handers both. Are the lefties getting screwed over on this deal?

Jess
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TWOHAND834

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Re: Help me make sense out of this...
« Reply #1 on: June 30, 2009, 07:28:35 PM »
I think you are looking at it wrong.  My thought is that if you had the ball and looked at it, the bottom would point straight towards you.  The picture I believe is just a way to get a better look as to the shape of the core.  The bottom does not point to a certain side.  In other words, if you drilled the ball pin above bridge, cg under bridge, and the MB stacked directly below, the bottom of the core is pointing directly at you.  Hope this helps.
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JessN16

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Re: Help me make sense out of this...
« Reply #2 on: June 30, 2009, 07:43:31 PM »
quote:
I think you are looking at it wrong.  My thought is that if you had the ball and looked at it, the bottom would point straight towards you.  The picture I believe is just a way to get a better look as to the shape of the core.  The bottom does not point to a certain side.  In other words, if you drilled the ball pin above bridge, cg under bridge, and the MB stacked directly below, the bottom of the core is pointing directly at you.  Hope this helps.
--------------------
Steven Vance
Pro Shop Operator
Striking Results Pro Shop
Red Carpet Lanes
Duluth (NE Atlanta), Georgia

If anyone out there is worried about the scores being too high, try duckpin!!


Either way, that still leaves the horizontal part of the "L" either facing away from or towards the bowler.

I used the pins' perspective because it's easier,  but let's use the "holding" perspective instead.

You're a righthander, you grab the ball and get up on the approach. With this drill pattern, the top of the vertical part of the "L" will terminate under your fingers (with the ball being held, the pin is facing back towards the setee area and the core is somewhat upside-down). The bottom of the vertical part of the "L" will be aimed at the masking unit.

That still leaves the horizontal part of the "L." If you're on Lane 4, it will be pointing at Lane 3 and parallel to the foul line. It will also be pointing in the general direction the ball is going to go after being thrown (i.e., at the pocket, a right-to-left path).

Now, switch hands. Put the ball in your left hand. The pin stays in the same orientation, as does the vertical part of the "L." The horizontal part is still facing Lane 3, but is now orientated  away from where a lefthander wants the ball to go: The ball will hopefully move left-to-right, but now the core is facing in the opposite direction of that path, not the same direction.

To summarize:

Righthander: Intended ball path right-to-left, core is pointing left.
Lefthander: Inteded ball path left-to-right, core is still pointing left.

Jess

Edited on 6/30/2009 7:44 PM
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Mark T. Trgovac

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Re: Help me make sense out of this...
« Reply #3 on: June 30, 2009, 10:26:22 PM »
quote:
quote:
I think you are looking at it wrong.  My thought is that if you had the ball and looked at it, the bottom would point straight towards you.  The picture I believe is just a way to get a better look as to the shape of the core.  The bottom does not point to a certain side.  In other words, if you drilled the ball pin above bridge, cg under bridge, and the MB stacked directly below, the bottom of the core is pointing directly at you.  Hope this helps.
--------------------
Steven Vance
Pro Shop Operator
Striking Results Pro Shop
Red Carpet Lanes
Duluth (NE Atlanta), Georgia

If anyone out there is worried about the scores being too high, try duckpin!!


Either way, that still leaves the horizontal part of the "L" either facing away from or towards the bowler.

I used the pins' perspective because it's easier,  but let's use the "holding" perspective instead.

You're a righthander, you grab the ball and get up on the approach. With this drill pattern, the top of the vertical part of the "L" will terminate under your fingers (with the ball being held, the pin is facing back towards the setee area and the core is somewhat upside-down). The bottom of the vertical part of the "L" will be aimed at the masking unit.

That still leaves the horizontal part of the "L." If you're on Lane 4, it will be pointing at Lane 3 and parallel to the foul line. It will also be pointing in the general direction the ball is going to go after being thrown (i.e., at the pocket, a right-to-left path).

Now, switch hands. Put the ball in your left hand. The pin stays in the same orientation, as does the vertical part of the "L." The horizontal part is still facing Lane 3, but is now orientated  away from where a lefthander wants the ball to go: The ball will hopefully move left-to-right, but now the core is facing in the opposite direction of that path, not the same direction.

To summarize:

Righthander: Intended ball path right-to-left, core is pointing left.
Lefthander: Inteded ball path left-to-right, core is still pointing left.

Jess

Edited on 6/30/2009 7:44 PM


The horizontal part that you are speaking of, I think is the MB. This would mean that with your thoughts, the peace you feel would point wrong for a lefty is wrong. Yes it would point in the same direction as it does for a right hander if it was drilled straight up and down on the center line. Yet nothing would point to the left or right. It would be straight up and down.
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J_Mac

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Re: Help me make sense out of this...
« Reply #4 on: June 30, 2009, 11:20:32 PM »
This ball, like the MoRich Pioneer, is probably a Z spinning asymmetric ball.

From the DeTerminator manual -
quote:
Y-Spinning Versus Z-Spinning Balls

This manual mentions that a ball with a mass bias has either a Y-Spinning core or a Z-spinning core. The difference between the two is where the ball’s preferred spin axis is on the ball. The ball can be imagined to have three axes (see Figure 7). The X-axis goes directly through the pin and the center of the ball. The Y-axis runs perpendicular to the X-axis, and goes directly through the mass bias mark on the surface of the ball and through the center of the ball. Hence a ball that spins around its mass bias has a Y-Spinning core.
The Z-axis also goes through the center of the ball, and runs perpendicular to both the X and Y-axes. A Z-Spinning core spins 90° from both the mass bias and the pin.


What this means is the arm of the core not on the X-axis isn't what the ball spins up to.  Picture a framing square and take into consideration how it would best fly through the air when thrown.

IMHO, That arm is there to produce pin out as much as it's there to create mass bias strength.  This is similar to a Tropical Storm as well, but the Tropicals  seem to have more MB differential than the Links.
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DP3

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Re: Help me make sense out of this...
« Reply #5 on: June 30, 2009, 11:33:28 PM »
The offset of the L shape is pointed towards the "thumb" persay of the bowler if the MB was drilled near the thumb.  TO put it in terms we all can understand.
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dizzyfugu

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Re: Help me make sense out of this...
« Reply #6 on: July 01, 2009, 02:24:11 AM »
quote:

What this means is the arm of the core not on the X-axis isn't what the ball spins up to.  Picture a framing square and take into consideration how it would best fly through the air when thrown.


Yup. I would not expect too much reaction effect from this "arm". Its main purpose is IMO to create some significant pin-out that allows more drilling options than just the 1-2" you would get with just a pancake weight block. The Tropicals work by the same principle, as well as the Power Grooves. I think the L-shaped core was just chosen because it is easy to produce, since it is just one piece, but I'd expect the ball the behave like any low MB ball, nothing fancy.
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JessN16

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Re: Help me make sense out of this...
« Reply #7 on: July 01, 2009, 04:00:03 AM »
quote:
This ball, like the MoRich Pioneer, is probably a Z spinning asymmetric ball.


What this means is the arm of the core not on the X-axis isn't what the ball spins up to.  Picture a framing square and take into consideration how it would best fly through the air when thrown.

IMHO, That arm is there to produce pin out as much as it's there to create mass bias strength.  This is similar to a Tropical Storm as well, but the Tropicals  seem to have more MB differential than the Links.


I can see what you're talking about with the framing square being thrown through the air.

I just picked the Link for my example because its core is very plain and easy to visualize in motion. My question is does this translate to some of the more complicated cores, like the MoRich cores or the other "blockier"-type cores where there's more going on.

I guess what I'd really need to see is a core suspended in midair, out of the ball, with markers sticking out of it showing where they would be if there was a shell and filler around the core. The ball cutaways that accompany marketing photos in the reviews section cause an optical illusion.

Jess
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