Author Topic: Pin Up vs Pin Down (Read 12938 times)

MK · « **on:** May 21, 2011, 09:14:32 AM »

At the recomendation of the Storm guys, I recently drilled a Rotogrip Theory with the pin above the bridge (in the gripline) and the mass bias in a strong position. I beleive it worked out to be a 5 1/2 x 4 1/4 x 3 drill. This drill pattern me gave me great control, length, with a strong back end that continues all the way to the pin deck just like the Storm guys said it would. I love the drill pattern (strong but controlled).

Now my question is, what would the effect had been if I I drilled the ball with the pin below the bridge?

Stated another way, what effect does pin above the bridge versus pin below the bridge have on a ball

MK

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cheech · « **Reply #16 on:** May 24, 2011, 07:14:41 AM »

you oculd very well be correct. while i was drawing pictures and if you leave the pap in the same location and move the pin it appears that the drill angle increases. but ive never seen anyone do that. you always base the pap location on the drill angle that you choose.

dR3w wrote on 5/23/2011 9:47 AM:I don't see from a geometry point of view how moving the pin down along the grip centerline will decrease the drilling angle. For example if you drill the pin above the fingers, on the grip centerline, and the CG straight down the centerline (for ease of explanation), with a 0" up pap, you will have a drilling angle less than 90 degrees. If you move the pin straight down to the middle of the grip centerline, you will have an angle of 90 degrees. I just don't see how the drilling angle increases?

cheech wrote on 5/21/2011 8:48 PM:assuming you dont have an extreme PAP the pin above bridge vs pin below bridge would differ in the length and response to friction. using the dual angle technique, moving the pin directly down the centerline you would decrease the drill angle resulting in less length. decrease the pin to pap distance which would most likely move it closer to the PAP promoting retainment of axis rotation and increasing the VAL angle making it less sensitive to friction. this would result in an earlier and smoother ball motion as well as more flare potential. it would most likely be stronger overall especially in heavier oil

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dR3w

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Edited by dR3w on 5/23/2011 at 9:48 AM

sacred heart university bowling, jr.
greatest accomplishment:shooting 603 and not shooting one 200 game(130,173,300)...lol
balls for sale in my profile
everyone is born right handed, only the gifted overcome it

batbowler · « **Reply #17 on:** May 24, 2011, 08:30:43 AM »

In the dual angle layout, it's not the drill angle you change by moving the pin up or down! You're changing the val angle! You can have a 45 degree drill angle pin above the fingers and a 45 degree drill angle pin below the fingers. You will change the pin to val angle. Pin below fingers are around a 75 degree val angle and pin above is in the 45 degree angle range. Lower val angles will place the pin closer to your val or in Storm lingo, pin buffer closer to the 1" to 2" range. Pin down for me reads the midlane sooner and has a more even and continuous arc at the break point. If I want the motion shape to be more even, or like a rainbow. I go with a pin down drilling. If I want a more angular shape like a hockey stick, I go with pin up with a lower val angle/shorter pin buffer. Keep in mind that the ball characteristics needs to be considered on the drilling. As JustRico stated, coverstock prep is key to the desired ball reaction and shape along with the ball selection and layout choice! Just my $.02, Bruce

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cheech · « **Reply #18 on:** May 24, 2011, 05:00:00 PM »

actually if you draw it out and stack the pin and CG on the centerline moving the pin and CG down the senterline would decrease the pin length and increase the drill angle. what you are saying makes sense if you keep the same pin length.

sacred heart university bowling, jr.
greatest accomplishment:shooting 603 and not shooting one 200 game(130,173,300)...lol
balls for sale in my profile
everyone is born right handed, only the gifted overcome it

MK · « **Reply #19 on:** May 26, 2011, 08:35:30 AM »

Brickguy -

I am intrigued by your pin down reply that you have changed all or most of your drill patterns from a pin-up to a pin-down layout. You and I sound like we have very similar speed and revs. So far, I have never made the move to go from a pin up to a pin down drill. And, I have a brand new Nano that I am ready to drill.

Tell me more about the differences you see when you moved from pin up to pin down. Did you still have alot of revs at the pin deck on agressive balls like Nano's and Theorys? Stated differently, have you ever noticed that your medium rev release on agressive balls sometimes burn up it's revs before hitting the pin deck?

Thanks,

MK

Xcessive_Evil · « **Reply #20 on:** May 26, 2011, 11:27:55 AM »

Given the same exact ball, same exact surface, and same MB or CG angle, the pin-up will give you a later, but faster response to friction with moreso end over end roll. The pin down will respond sooner, but at the same time slower, creating more backend.

For me, my high end equipment with the exception of my virtual energy are pin up with varying surfaces. everything else is pin down.

I stone 8s and 9s like its cool...

Author Topic: Pin Up vs Pin Down (Read 12938 times)

MK

Pin Up vs Pin Down

cheech

Re: Pin Up vs Pin Down

batbowler

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cheech

Re: Pin Up vs Pin Down

MK

Re: Pin Up vs Pin Down

Xcessive_Evil

Re: Pin Up vs Pin Down