Author Topic: Understanding Differential... (Read 2378 times)

tenpinspro · « **on:** March 04, 2007, 09:10:27 PM »

Hey Guys, another tip coming from Tag Team Coaching to help educate our fellow bowler and better understand what we "want" to look for in ball reaction. I wrote a post a while back in regards to RG's and how it affects ball motion (If someone were to be so kind to find and bump that post back up to run with this one). This is the other crucial piece in core design that dictates ball motion/reaction.

Differential: Differential is one of the main factors that help dictate the amount of flare that a ball can have, flare dictates the amount of movement of the core in a ball which (in English) helps dictates (possible) hook. The more flare we have, the more hook we (can) have. Same goes opposite, the less flare we have, the less hook we (can)have. Here's the scale for this one...(courtesy again of Danny Speranza)

Differential Estimated track flare*
.000-.009 O" Generally, the more the ball flares, the sooner the ball will want to hook, or grab the lane.

.010-.019 0 to 1-1/2"
.020-.029 2 to 3"
.030-.039 3 to 4-1/2"
.040-.049 4 to 5-1/2"
.050-.059 5 to 6-1/2"
.060-.069 6 to 8"
.070-.080 7 to 10"

Looking at this chart, we can (generically) equate the numbers (listed in differential) into inches of flare with the higher number being up to .5+ that number. For example, .040-.049 (generically) translates into approximately 4 to 5.5 inches of flare to the high end. Without having to be a physicist, we can get a guesstimate about any ball we look at. All our ball talkers (signs) that we see at our local pro shop usually have this information. I'm just trying to help translate the info to plain English.

With this being said, typically on drier lanes, we'd want less flare which means that we would want to look for a piece with a lower differential. On a generic average, plastic balls are about .010. For more hook, we'd probably want a ball with a higher differential which would offer us more overall hook potential. The two highest balls I know of in differential (please add more if I missed any) are the Super Carbide Bomb and the SD-73. However guys, please remember that "coverstock" plays a huge role in friction (just like our snow tires/chains) that also dictate movement.

Any questions, please feel free to ask and Tag Team Coaching will get back to you, thanks!

* Will vary depending on bowlers' style.
** will vary depending on cover stock

--------------------
Rick Leong - Ten Pins Pro Shop
Vise Inserts Staff
Dexter Advisory Staff

Tag Team Coaching - Co-Founder

See profile for Track Ball videos

*El Presidente of the Track Legion

Edited on 3/20/2007 4:37 PM

tenpinspro · « **Reply #16 on:** March 20, 2007, 04:46:37 PM »

quote:
Those numbers is only accurate if you drill the ball 3 3/8 pin-pap right?

To obtain maximium flare, pin would be at 3 3/8 from pap aka "leverage". Numbers and flare will vary bowler to bowler...
--------------------
Rick Leong - Ten Pins Pro Shop
Vise Inserts Staff
Dexter Advisory Staff

Tag Team Coaching - Co-Founder

See profile for Track Ball videos

*El Presidente of the Track Legion

Leftyhi-trak · « **Reply #17 on:** March 20, 2007, 05:43:07 PM »

Rick,

Reason for asking about flare rings is this. A few newer pieces have shown big flare rings with large seperation but are very iffy to quality performance when compared to other balls of the same strength, surface and drill pattern. Would you believe this failure in performance is caused from core driven issues or from cover. I've asked this as many people have asked about these two new pieces but the guys in the shop and myself feel less than fuzzy in recommending one to them. If someone has been presistent or really wants one we have been drilling about 3/4" to 1" longer in P to P to reduce flare also if they are heavy handed putting a flare reducer in. I apologize if this rambles just trying to get a better understanding of ring seperation. Also we were told if they seperate too much they flare out.

laufaye · « **Reply #18 on:** March 20, 2007, 05:52:01 PM »

quote:
Rick,

Reason for asking about flare rings is this. A few newer pieces have shown big flare rings with large seperation but are very iffy to quality performance when compared to other balls of the same strength, surface and drill pattern. Would you believe this failure in performance is caused from core driven issues or from cover. I've asked this as many people have asked about these two new pieces but the guys in the shop and myself feel less than fuzzy in recommending one to them. If someone has been presistent or really wants one we have been drilling about 3/4" to 1" longer in P to P to reduce flare also if they are heavy handed putting a flare reducer in. I apologize if this rambles just trying to get a better understanding of ring seperation. Also we were told if they seperate too much they flare out.

Actually with most low RG/high diff ball, any where from 3-5 or even 5.5 pin -pap are still consider high flare potential, and flare-out or over-flaring not neccesary a bad thing, its just another way to find out what was happening to the ball, then adjust accordingly, too much seperation and seeing the ball burn up too much, put a reducing hole or get the surface to higher grit/polish. But some time burn up some in the front can help some heavy hand player to tame down a bit on the backend reaction.
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Laufaye

Amleto · « **Reply #19 on:** March 20, 2007, 05:59:29 PM »

I would say that differential totally determines the maximum possible flare. Sure friction may reduce from the maximum, but the potential is still there.

In other words, many things affect the flare on the lane, only one thing determines the maximum possible flare (given oily lanes).
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Am-1337-o

Author Topic: Understanding Differential... (Read 2378 times)

tenpinspro

Understanding Differential...

tenpinspro

Re: Understanding Differential...

Leftyhi-trak

Re: Understanding Differential...

laufaye

Re: Understanding Differential...

Amleto

Re: Understanding Differential...