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Hey Al, just what in the hell is the "BIG DAVE trying to pull now. You know it sure is funny but since I blocked The BIG DAVE from my inbox I hear from just about most clubmakers on his latest asinine answers every time someone asks a question and I post an answer to that person's question the "BIG DAVE" has got some fool-hearted answer to try and make me look bad and that I really don't know what I talking about. Just to make myself clear BIG DAVE before I got sick I most likely built more clubs / Drivers / and Sets of Clubs in one day then you "HAVE" in your whole life. Big Dave I've had golfers come to my shop from all over the US of A because of my skills in fitting a person to his clubs. BIG DAVE, the one reason I can say that is your own E-Mail posts, you stated, I only have built just so many clubs for myself and my friends, Well BIG DAVE you can only build just so many golfclubs for yourself and DAVE from my understanding on E-Mail posts that have been sent to me is that you really don't have "THAT MANY friends and ain't it just a wee bit funny that at the end of every year I must report every dollar earned on Schedule "E" of the USA.Tax Code when was the last time you reported "ANY" profit or loss on your taxes. Tell you what BIG DAVE, I'll take that assignment on myself, I'll call the IRS and check, every member. of ShopTalk that thinks I should, send me a private E-Mail. You see BIG DAVE, I know just what I'm talking about is because of 23 years, come last April, of hands on experience not some asinine idea that runs through your head at some place in time, my Mother, god bless her soul, used to say "Well it go's in one ear and out the other". But the statement that I like best would be this one BIG DAVE, I was building golfclubs before you were allowed out after supper. David, it is because of you that I hope that this operation is successful so that when you make statement or some blackboard explanation instead of by some "HANDS ON IDEA" I will still be around to bust your you know whats, could not say balls because we now have about 6 to 10 women as members on ShopTalk. Next time some one asks for advise, like the epoxy question, if I do not know the answer I keep my mouth shut and learn al lot, because Dave you can not learn anything with your foot in your mouth.
Now as I have stated in my original post the first place I would look is inside the bore of the shaft. I say this because of the years of experience I I've had in replacing shafts that that has happened to, when you start spending money out of "YOUR" own pocket you do remember these things, it might take awhile to remember just how & why but you will remember,. I think you are all not looking at the man's swing speed, 154 mph's, that is a very high speed , I know that my equipment, almost out of date replaced in 1995, won't. If there is enough epoxy in the bore it will not allow the shaft to twist during the swing, like if you have a shaft that has a 2.5* torque but you fill up the shaft with epoxy to just less than the hosel bore you in essences are turning that shaft into a .5* of torque instead of the 2.5* shaft that the other major components were made for, not tip stuff or is tip stiff but the manufacturer figured that the most that his shafts would see is around 110 mph's so why over build. . I think that is the reason, plus the weight factor, why race car drivers and car builders use high chrome moly tubing. Its because that form of tubing gives you more bang for the buck, Remember no matter what type of material somethins made from it has it's flaws, like back in the mid 60's Ford Motor was running in all of their GT 40 cars nickle chrome forged crankshafts allof the hardness most expenseive material there is in the steel form. In their very first year of running in the LeMans race w/in a 20 mintue time span all the GT40's were out of the race, reason, all the crankshafts broke.. It just goes to show you bigger isn't always better, Ford went, or came back, the following year with a standard old castiron crankshaft and all for cars lasted through the whole race.A couple of them actually won.
RK
A small piece of trivia, do you know why they named the cars "GT40" ................ The cars were just 40" high
-------Original Message-------
Date: Sunday, July 27, 2003 2:09:56 PM
Subject: Re: ShopTalk: Question re: Epoxy in Shaft (Was: Epoxy for LDC Pro's)
Dave,
Does my theory of hitting the ball high and towards the heel, ie. at or
very near the hosel, hold any water?
Al
At 11:49 AM 7/27/2003, you wrote:
>At 11:43 PM 7/26/03 -0700, Alan Brooks wrote:
>>In principle, I agree with Dave T. A plug of epoxy on the inside of the
>>shaft will cause a stress concentration. That said, however, I find it
>>unlikely that effect is significant. The modulus of elasticity of the
>>epoxy is so much lower than that of the steel hosel and the graphite
>>reinforced composite shaft that it's effect is going to be negligible.
>
>Offhand, I'd have thought so too. An article in Golfsmith "Clubmaker" a
>few years ago claimed otherwise. They said that their observations of
>broken shafts suggested that an epoxy plug at or above the tip (1)
>increased the chance of breakage substantially, and (2) when breakage
>occurred, it was always at the top of the plug.
>
>>As I said in my other post, I think this breakage is either due to the
>>shaft tip reinforcing never being designed for this club head speed, or
>>something in the assembly process that is reducing the amount of
>>reinforcing above the hosel. And, again, if the shaft is breaking off
>>straight across (as opposed to a spiral fracture)
>
>Interesting point about the spiral fracture. If y'all don't know what Alan
>is talking about, try this experiment. Take two sticks of round chalk:
> * With one stick, bend it till it breaks. It will be a jagged but mostly
> straight-across break.
> * With the other stick, TWIST it till it breaks. Twist it about its own
> axis. The break line will spiral around the stick at a 45-degree angle.
>
>Anyway, if it were a metal shaft (or other anisotropic material) and if
>the break were not right at the hosel, I'd certainly agree. I'm not as
>sure in this case because:
> * The material definitely has strength-aligned directions. This might
> affect the spiral. But more important...
> * There is a definite discontinuity at the top of the hosel. A long,
> well-graded cone filled with epoxy will minimize its effect. But if the
> coning is too short or filled with air, there will be a decided stress
> concentration there. I could be convinced that a torsional stress
> combined with a concentration point at the top of the hosel could result
> in a straight-across break rather than a spiral.
>
>That doesn't mean that that the impact stress that causes the break is
>torsional. It certainly could be the clubhead bending backward due to the
>impact. But it could also be torsional, as originally suggested.
>
>> it is a consequence of bending or tension in the shaft and if it is
>> consistently breaking just above the hosel, it's most likely bending
>> from the centrifugal toe down forces that is initiating the failure,
>> with tension finally separating the head and shaft tip from the rest of
>> the shaft.
>
>I have a lot of trouble with this. The reason is that the forces due to
>impact with the ball are much greater than the forces due to the swing
>alone (toe down due to centrifugal force. I've never EVER heard of a shaft
>that broke at the hosel during a practice swing that didn't hit anything.
>It always involved contact, either with a ball, the ground, or something
>else (a tree?). If it were the centrifugal toe-down forces, then a
>practice swing is as likely as a real swing to cause the problem.
>
>Cheers!
>DaveT
>
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