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 Post subject: Motion Hole and Asymetrical Balls
 Posted: Fri Dec 01, 2017 11:28 pm Post Number: #1 Post
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I’ve been reading and watch video about Motion Holes and most of what I’ve found seems to pertain to Symetric cores and there was at one point a few mentions of possible testing on asym but then it seems the results aren’t posted, or maybe I’m not seeing them. Am I correct in assuming that motion holes do little for Asym balls? If I’m incorrect can someone please point me in the right direction?

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 Post subject: Re: Motion Hole and Asymetrical Balls
 Posted: Sat Dec 02, 2017 12:50 am Post Number: #2 Post
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Jmc1972 wrote:
I’ve been reading and watch video about Motion Holes and most of what I’ve found seems to pertain to Symetric cores and there was at one point a few mentions of possible testing on asym but then it seems the results aren’t posted, or maybe I’m not seeing them. Am I correct in assuming that motion holes do little for Asym balls? If I’m incorrect can someone please point me in the right direction?


Its usually too difficult to get them statically legal and get the desired base reaction.
I think in the motion hole thread on here Mo mentioned what base layout he would use on an Asym.

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 Post subject: Re: Motion Hole and Asymetrical Balls
 Posted: Mon Dec 04, 2017 4:30 pm Post Number: #3 Post
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Jmc1972 wrote:
I’ve been reading and watch video about Motion Holes and most of what I’ve found seems to pertain to Symetric cores and there was at one point a few mentions of possible testing on asym but then it seems the results aren’t posted, or maybe I’m not seeing them. Am I correct in assuming that motion holes do little for Asym balls? If I’m incorrect can someone please point me in the right direction?


It can be done. I've done a few and I think elgavachon has too. For me it gave the ball way too much length and not enough backend. I had to use lots of surface to get it to read. I can usually get it done with a ball with the cg way out of line. I'm left-handed and my friend is right-handed, so if we order a second and it's out of line one way or the other, we can motion hole it if we want.

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 Post subject: Re: Motion Hole and Asymetrical Balls
 Posted: Mon Dec 04, 2017 5:05 pm Post Number: #4 Post
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If I remember correctly (not a given for me) Mo stopped recommending the Motion Hole layout for asymmetrical balls because the somewhat random location and shape of the asymmetry made it a craps shoot whether it would work well or not. -- JohnP


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 Post subject: Re: Motion Hole and Asymetrical Balls
 Posted: Mon Dec 04, 2017 5:59 pm Post Number: #5 Post
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I thought it was due to the difficulty of getting the statics legal, but I could be wrong. I guess we need to find a reference to know for sure.

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 Post subject: Re: Motion Hole and Asymetrical Balls
 Posted: Mon Dec 04, 2017 6:51 pm Post Number: #6 Post
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Some info that may help.

MO:
I don't suggest MOtion Hole drillings for asymmetrical balls. I suggest using the latest expanded Radical asymmetrical drilling instructions for ALL asyms.

I still don't recommend MOtion Holes for asyms. because it becomes very difficult to get the pin/cg/PSA alignment that will end up with the cg on the centerline of the grip with the best layout for the ball.

elgavachon wrote:
I have put Motion holes in a lot of asymmetrical balls with success. With the pins above the fingers, the 11" motion hole will usually be taking wt. out of the thumb quadrant. A long pin to CG ball will make it easier to get the ball to static wts. Most of the balls with those holes go very long. It is also easier if you can get a cg kicked to the left. The problem I have ran into is that the PSA can end up very far left of the thumb-hole when trying to get an in-line CG into position (short pin balls will accentuate the problem). If the ball has a very high I.D., you can flare funny. The ball will clip the thumb-hole very easily. I think the PSA can move towards the NAP on (with less than 6 3/4" distance). I have shortened the distance to the hole so that the opposite end of the axis (in conjunction with the thumb-hole) can pull the PSA to within 6 3/4" of the positive axis on the lower I.D. balls and they seem to work fine. For very high I.D. balls, I prefer to have the CG to the left.


Mo Pinel wrote:
You have itemized why we currently recommend MOtion Holes ONLY for syms. They work well on asyms, but are tricky to do. Need cgs left of pin to PSA line (for RH) to do them easily most of the time.

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