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 Post subject: Re: Gradient Line Balance Hole revision as of March 2011
PostPosted: Sat Mar 26, 2011 3:33 am 

Joined: Wed Feb 23, 2011 4:00 pm
Posts: 44
Location: Portland, OR
Interesting Justin, thank you for bringing this to our attention. I will have to keep this in mind and now find out what p hole my sr2 has now lol from the looks its a p3 according to your example.


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 Post subject: Re: Gradient Line Balance Hole revision as of March 2011
PostPosted: Sat Mar 26, 2011 8:56 pm 

Joined: Thu Aug 27, 2009 10:43 pm
Posts: 1701
Location: Rochester NY
catinthehat300 wrote:
ok... for clarification then....if the P1 is a 18% decrease in drilled differential (Justin quote) and P1 drill created very angular movement (plamormick quote) then do the P3 and P4 holes create a more early/arching roll?

If so.... in laymans terms - why?


A P1 hole decreases differential which reduces flare and dynamic instability, which promotes energy retention. If a ball expends less energy flaring, it will have more to release when it sees friction.

A P3 hole increases the differential which increases flare and dynamic instability, which promotes an earlier release of energy. If a ball is flaring more, it bleeds energy sooner and has a slower response to friction.


A couple of those terms may be a blurring of the actual physics, but I believe it to be an appropriate description. My opinion is that there is a relationship of rotational and translational energy, triggered by friction, that is controlled by the mass properties and surface texture of the drilled ball.


catinthehat300 wrote:
I tend to use P3 or P4 holes when needed, thinking "stronger is better", but I am completely wrong. Maybe "less is more" - as a decrease in the differential the P1 causes.

Please help me with your thoughts....


In practice with the equipment of today, you have to get your initial layout close, and then fine tune with a balance hole. A balance hole can help, but not always fix, a bad initial layout. I have seen that a P1 increases backend when a ball checks early, and a P3/P4 placement promotes earlier and smoother, which can end up hooking more overall in some situations.



I also have an alternate position that I use in certain cases. 2" down the VAL from PAP, but only on symmetrics. Sometimes when I want a Sym to roll sooner, I place this hole. The drilled PSA shifts towards the hole and decreases the final drilling angle. P3 and P4 holes in syms give them more of an asymmetric type of roll. Which can be desirable at times... an SR2 with a bit of intermediate :)


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