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 Post subject: SR2 /Sigma Tour/ layout sugestion/ symmmetrical pin to pap
PostPosted: Wed Aug 31, 2011 4:39 am 

Joined: Tue May 03, 2011 6:12 pm
Posts: 98
I am a proud owner of an SR2 drilled 70x4x40 1000 matt. The ball rolls great I have shot a couple 300s with it. I am thinking of getting a Sigma Tour and putting the same layout on it. I figured if they are too similar in reaction I can change the surface or add hole. I am speed = revs, 7* tilt, 45* rotation +/- 15*. If anyone has any good suggestions I welcome them


Last edited by TOP5 on Thu Sep 01, 2011 12:23 am, edited 1 time in total.

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 Post subject: Re: SR2 owner thinking of getting Sigms Tour. layout sugestion
PostPosted: Wed Aug 31, 2011 4:42 am 

Joined: Thu Aug 27, 2009 10:43 pm
Posts: 1701
Location: Rochester NY
60x35@5.25". Have this one retain what little tilt you have to make a more pronounced backend move. If it misses the breakpoint hit the surface, hole placement can also be significant.


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 Post subject: Re: SR2 owner thinking of getting Sigms Tour. layout sugestion
PostPosted: Wed Aug 31, 2011 12:52 pm 

Joined: Tue May 03, 2011 6:12 pm
Posts: 98
question. For bowlers like me who have low axis tilt. Is it ideal to use pin distances/layouts that reduce the differential? Would to much differential make my ball roll out quicker limitting me to straiter angles?


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 Post subject: Re: SR2 owner thinking of getting Sigms Tour. layout sugestion
PostPosted: Wed Aug 31, 2011 1:28 pm 

Joined: Thu Aug 27, 2009 10:43 pm
Posts: 1701
Location: Rochester NY
Differential isn't as much the factor in pin distance decisions as tilt retention. Asymmetrical balls are much easier to deal with because the flare amount remains constant from 2.5"-6.75".

Symmetrical balls have a flare apex at 3.375", but a linear retention scale from 6.75" to 0". The chart helps illustrate this.
Image

When axis tilt and axis rotation are equal, that defines the roll stage when the ball has maximum hitting power. As a low tilt player, you want the ball to retain enough tilt to ensure transitions happen at the proper time. With high tilt players, you want to burn tilt to ensure transitions happen at the proper time.


Differential alone isn't the determining factor to playing straighter angles, it is primarily a balance of surface and differential ratio to control the timing and length of the transitions.


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 Post subject: Re: SR2 owner thinking of getting Sigms Tour. layout sugestion
PostPosted: Wed Aug 31, 2011 3:37 pm 

Joined: Tue May 03, 2011 6:12 pm
Posts: 98
the points where the red line intersect the black line. Is that showing the minimum rate of tilt burn? Also if I for some reason punched a P3 hole would that increase the rate of tilt burn?


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 Post subject: Re: SR2 owner thinking of getting Sigms Tour. layout sugestion
PostPosted: Wed Aug 31, 2011 4:18 pm 

Joined: Thu Aug 27, 2009 10:43 pm
Posts: 1701
Location: Rochester NY
A P3 hole will have a very minimal impact on the rate of tilt burn, only the diff ratio and as a result spin time. The diff ratio directly controls the length of time between the first and second transition.

There is no actual value for the tilt burn, that line only is intended to show the relationship of pin distance to tilt burn. The intersection points will vary based on the mass properties of the ball as well as the bowler's delivery.


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 Post subject: Re: SR2 owner thinking of getting Sigms Tour. layout sugestion
PostPosted: Thu Sep 01, 2011 12:07 am 

Joined: Tue May 03, 2011 6:12 pm
Posts: 98
Thanks for the great info. I will try that layout. I will post the result


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 Post subject: Re: SR2 /Sigma Tour/ layout sugestion/ symmmetrical pin to pap
PostPosted: Mon Sep 05, 2011 9:52 pm 

Joined: Tue May 03, 2011 6:12 pm
Posts: 98
JustinWi wrote:
60x35@5.25". Have this one retain what little tilt you have to make a more pronounced backend move. If it misses the breakpoint hit the surface, hole placement can also be significant.

question: My PAP is 4.5" over and .5" up. that layout puts the cg .5" right of my grip center. Would it be wise to reduce the first angle to accommodate a balance hole just in-case the ball reaction needs to be fine tuned?


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 Post subject: Re: SR2 /Sigma Tour/ layout sugestion/ symmmetrical pin to pap
PostPosted: Tue Sep 06, 2011 1:20 am 

Joined: Thu Aug 27, 2009 10:43 pm
Posts: 1701
Location: Rochester NY
TOP5 wrote:
Would it be wise to reduce the first angle to accommodate a balance hole just in-case the ball reaction needs to be fine tuned?


Wouldn't be a bad idea, the drilling angle is inconsequential to reaction in symmetrical balls.


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 Post subject: Re: SR2 /Sigma Tour/ layout sugestion/ symmmetrical pin to pap
PostPosted: Wed Sep 07, 2011 11:34 pm 

Joined: Tue May 03, 2011 6:12 pm
Posts: 98
I went 40x5.25x35 with a shallow p2 hole box surface. The layout is golden. Struck the first nine in the first game and shot 278. The backends were flying by the seconed game so I switched to the SR2 and played straight up the track coming behind the ball creating a heavy roll, 236, 245. Those two balls show no mercy when you get them rolling. I make it a habit now to check my balls for splinters :lol:


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