The frequency measurement instructions/methods on the original Brunswick
shafts were very precise, and to my understanding factory measurements
were always done with a 2.5" clamp on ungripped shafts and at a specific
clamping pressure. The commercially available Brunswick machine that
used to be sold was really just for demonstration purposes, and thus was
designed to measure clubs with the grips on. That unit measured clubs
with grips, and at a 4.5" clamping length (and preferably with a GP Tour
Wrap grip). The measured frequency at 4.5" with a grip should
correspond to the factory unit that used the 2.5" clamp length with no
grip. In fact, the commercially available unit came with a calibration
shaft, that was essentially a Rifle shaft with a drill chuck on the tip,
and that was calibrated at the factory (i.e. measured in their unit at
2.5" ungripped). You would place that calibration shaft in your unit
using a slit Tour Wrap grip at 4.5" to verify that your unit was reading
the proper frequency. The calibration shaft that I used had the
frequency stated down to tenths of a CPM. I didn't have a Brunswick FM
(my buddy did), but I used his calibration shaft to "calibrate" my GS
unit to the Brunswick scale (which required a 3.25" ungripped clamp
length and ~5" gripped clamp length, likely due to a slightly lower
clamp pressure on my GS unit).
Tedd
________________________________
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Robert Devino
Sent: Wednesday, December 10, 2008 3:15 PM
To: ShopTalk@mail.msen.com
Subject: Re: ShopTalk: 7-iron at 353 cpm - how?
Hi Harry
Why not a 5" inch clamp. The BTR shaft is designed by the same
guy that designed the rifle shafts. It is basically his next generation
of rifle shaft but improved in the fact that with the new machinery he
has now he doesn't need to reinforce the tip, so the BTR doesn't swing
weight quite as heavy as a rifle shaft would. All shafts that Kim Braly
designs are designed to be frequencied with a 2.5" clamp not a 5" clamp.
I do use a 5" clamp on other manufacturers shafts. If you do any work
with a Rifle , KB Steel , or a BTR and you don't use a 2.5" clamp you
will not get a shaft to play the way Kim designed them too. If your
using a 5" clamp to build rifles or KB steels to a rifle chart then your
actually building about 20 - 25 cycles to soft. example if you build a
rifle shaft to a 6.0 with a 5" clamp your really building something more
in the range of a 4.0 .
Grip or grip off is a good question. I did mine with grip off.
Personally I always frequency with grip off becuase for one thing you
can change a clubs frequency by changing what grip they use and to just
have some kind of shop standard I went with grip off for our builds.
Loyd the guy that wrote the program for the FitChip said he does grip
on. But what if the fitting club doesn't have the same grip as the grip
he wants to use ?? This is a personal thing that varies from builder to
builder or fitter to fitter. Like I said we are experimenting with this
thing right now to see if we want to actually use it or not.
I don't know how a 334 cpm gives you a stiffer flex than a 343
cpm I am hoping you just have your numbers crossed. But your absolutely
right I had to used a DG X 100 to get there, no way I could get there
with any BTR or Rifle shaft.
Sincerely,
Robert Devino
14252 Delano St.
Van Nuys, Ca. 91401
(818) 770-0475
________________________________
From: Harry F. Schiestel <[EMAIL PROTECTED]>
To: ShopTalk@mail.msen.com
Sent: Tuesday, December 9, 2008 10:54:22 PM
Subject: ShopTalk: 7-iron at 353 cpm - how?
Hi Robert,
Why do you not use a 5" clamp like most other clubmakers so cpm
numbers can be compared easily? Just curious!
When you specify ""FitChip" fitting it recommend that I be
using a 7-iron cycling at 353 cycles using a 5" clamp."
I have a question ... does this stated number assume a grip on
or a grip off?
My son plays a 7-iron at length 36.75. Using 5 inch clamp, it
is 343 cpm or 7.9 flex with grip off and 334 cpm or 8.1 flex with grip
on. So basically he is playing the equivalent of a Rifle Flex 8.0 =
XX-Stiff.
What steel shaft would you have to buy to get it to be a
XXX-Stiff flex, which would be close to your stated 353 cpm? I do not
think a DG X-100 tipped will give you this kind of number unless you
have an extremely low swingweight, and many Rifle shafts are sold up to
6.5 flex. Just curious how you build a demo 7-iron with steel shaft at
XXX flex?
Thanks Harry S
www.myGolfDNA.com <http://www.mygolfdna.com/>
________________________________
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Robert Devino
Sent: Tuesday, December 09, 2008 9:18 PM
To: ShopTalk@mail.msen.com
Subject: Re: ShopTalk: Performance benefits of long drivers
You can put any club in a 1 handicapers hand and they will hit
it just fine in just a few swings. They might not hit it as well as a
well fitted club but they will adjust their swing and hit it pretty
good. Put that long driver in the average golfers hand and they will
loose accuracy for sure. It's just plain harder for them to get the
club around and hit the center of the face. If you doubt this gt some
of your buddys together and some imact tape and go test it out.
Now Dave your gonna love this. Recently we have started testing
the "FitChip" . Well it's been giving us some pretty interesting
numbers to build for people. First off i personaly play a BTR shaft
designed and manufactured by Kim Braly. It's pretty much his next
version of a rifle shaft. On a rifle scale I hit a 6.0 so my 7 iron's
CPM is 310 cycles (thats with a 2.5" clamp that would be about 335 with
a 5" clamp). This being determined by a swing speed calculation table
that we use (commonly used by a lot of fitters). Any way, after going
through a "FitChip" fitting it recomenede that I be using a 7 iron
cycling at 353 cycles using a 5" clamp. Well we look at the numbers
and said your kidding right!!! That's a board! But because I could I
built it and got on launch monitor to see what numbers came out.
Low and behold, my swing speed, ball speed and distance all went
up. Even when I lived in Colorado I only hit my seven iron about 175
max. Well the flight scope usually shows numbers a little shorter than
reality when used indoors because you only have a short distance to read
the ball with the radar. But it showed me hittng that club an average
of 183 and a number of shots went over 190. Now conventional thinking
would tell you that shouldn't happen but it did! I have not been the
only one that we did this with. But we have had several people that we
tried this with get what would seem to be really stiff shafts recomended
when you comapree it to what their swing speed would seem to indicate
they should be hitting and they just creem the ball. Doesn't make sense
to us yet but you can't see the results we are getting and not just
scartch your head a bit.
Maybe stiffer is better ????????
Sincerely,
Robert Devino
14252 Delano St .
Van Nuys, Ca. 91401
(818) 770-0475
________________________________
