Author Topic: General Pin Position question (Read 2950 times)

Neptune66 · « **on:** March 01, 2011, 01:39:17 PM »

I know that pin position affects ball roll, and other variables (like the ball's surface) probably diminish or enhance the effect. And my understanding is that pin up usually results in a later roll, and pin down usually earlier. But am curious what the effect (or at least the INTENDED effect) is when the pin is located more to the left or right.

For example.... the vast majority of my equipment is drilled with the pin above the ring finger (most were drilled for a house where the lanes are normally lightly oiled, with strong backends). Then I have a couple of balls with the pin under and very slightly to the right of the ring finger (for an earlier roll, or at least that was the plan).

But the main reason for my post, is my curiosity about the oddballs in my collection. A couple of balls have the pin even with and to the right of ring finger. At the 3:00-4:00 position. And on one "oddball" the pin is located above and in the middle of both fingers ... at 12:00.

It's not that I'm trying to change or fix any of these balls. I am not planning to plug and redrill. But a couple....especially the one with the "12:00" pin, I've had for some time, and am interested in what the driller was trying to do for me.

Thanks for any feedback/education.

MI 2 AZ · « **Reply #1 on:** March 01, 2011, 11:01:20 PM »

The pin position is relevent to your PAP. Each bowler will have their own specific PAP due to their unique release. Please refer to the following links that will better explain the concept of PAP and pin position than I ever could. Also, check out the link to the FAQ in my sig which should also have some info.

Ball Reaction Basics

Positive Axis Point - PAP

Pin Positions

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MI 2 AZ · « **Reply #2 on:** March 01, 2011, 11:12:38 PM »

Re: the clock you were using. I am not a driller, but I thought that whenever a clock position was referred to, the center of the clock was the center of the bowler's span. 12 o'clock would thus be directly in line north of the centerline of the span, either above or below the bridge of the fingers. So, 3 o'clock would be somewhere to the right of the center of span. Is that actually where the pin is on your one ball?

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dizzyfugu · « **Reply #3 on:** March 02, 2011, 01:32:42 AM »

As a addendum to MI 2 AZ's tips, a very basic/general info: the pin marks the core's top, and its instable positioning relative to its stable roll axis' causes the flare rings you see on the ball surface. The most stable and "powerful" axis is the one that actually goes through your PAP and the ball's center, hence the PAP's relevance for the layout. You have two additional axis', each in a 90° angle.

Anyway, when you place the core in the most instable position, which is at 3 3/8" from the PAP towards the pin ("leverage"), you create most flare, earliest hook and also quickest energy depletion, since the core wants to migrate its rotational axis towards one of the stable axis'. This migration can be influenced by the pin placement, as a relative postion of the core towards the PAP. The further you move away from leverage position, the less flare you create, and you influence when and how much the ball hooks or rolls. Moving the pin closer to the PAP will make the ball "rolly" and less hooking, because you put the core in a rather stable rotational position.

Moving it away ("to the left") means you put the pin closer to the second strongest rotational axis, and this is the normal setup for a ball to make sure the ball saves energy for the back end and actually shows the slide/hook/roll reaction pattern. Once the pin is at 6 3/4" away from PAP, the core is in a stable position again and the ball will hardly hook at all, maybe just though side rotation.

Sounds complicated, but it's actually simple laws of science at work

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DON DRAPER · « **Reply #4 on:** March 02, 2011, 04:07:49 AM »

The position of the pin will determine the amount of track flare you can get. By placing the pin on your axis or in the track of your ball the ball will still hook but you will see little track flare. By placing the pin between these two extremes you can create varying degrees of track flare.

BowlingChat · « **Reply #5 on:** March 02, 2011, 05:25:16 AM »

Pin position in relation to VAL angle indicates length of transition from Hook to Roll.

The shorter the VAL angle the faster the transition.

There is no difference in length, that is controled by surface texture and Drilling Angle (Asymmetrics).

For more information on these topics, please visit BowlingChat.net

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Crash7189 · « **Reply #6 on:** March 02, 2011, 09:14:33 AM »

Legends & Lanemasters used to give a great brochure with every ball . It explained it in a very easy to understand way. check with your proshop or other Bowlers. If they don't have one, send me your E-mail and I will Scan it and e-mail it to you.

Neptune66 · « **Reply #7 on:** March 05, 2011, 03:30:20 PM »

In response to MI 2 AZ 's question about the clock positions I was referring to:

"....12 o'clock would thus be directly in line north of the centerline of the span, either above or below the bridge of the fingers. So, 3 o'clock would be somewhere to the right of the center of span...."

Yes. This is exactly what I meant in describing the pin position on the one or two unusual balls (unusual compared to my other equipment).

Author Topic: General Pin Position question (Read 2950 times)

Neptune66

General Pin Position question

MI 2 AZ

Re: General Pin Position question

MI 2 AZ

Re: General Pin Position question

dizzyfugu

Re: General Pin Position question

DON DRAPER

Re: General Pin Position question

BowlingChat

Re: General Pin Position question

Crash7189

Re: General Pin Position question

Neptune66

Re: General Pin Position question