What is a CPM in golf clubs?
CPM literally stands for "Cycles Per Minute" and is the most practical measurement unit to describe the resonant frequency of a club after assembly. Why is this important to golf?
What is the CPM of a golf shaft?
A True Spec Golf fitter measures the CPM of a golf shaft. Simply put, CPM stands for “cycles per minute,” which measures the frequency of a golf shaft.
How important is CPM when matching shafts?
That means if your 7-iron measures 304 cpm, then your 8-iron should be 308 cpm. In conclusion, CPM can be a very effective way to match shafts, but not as effective in determining true flex.
What does 255 CPM mean on a golf club?
A12: A golf club at 43" would oscillate in a frequency analyzer at 255 CPM to be a 5.5 flex designation. A 43" club oscillating 265 CPM would be a 6.5 flex designation. If you drop the "2" in "255" and "265", the relationship becomes apparent.
What CPM is stiff shaft?
A shaft with a higher frequency (more CPMs) is stiffer than one with a lower frequency (fewer CPMs). A shaft with a frequency of 7.0 is very stiff and a shaft with 2.0 frequency is very soft.
How is shaft CPM measured?
0:522:24Measuring Shaft Frequency - YouTubeYouTubeStart of suggested clipEnd of suggested clipOver the edge of the shaft. That way everything fits perfectly. And from here. It's just a flick. SoMoreOver the edge of the shaft. That way everything fits perfectly. And from here. It's just a flick. So as this one reads through our first go around it came in at 281 CPM. You want to try to get a view.
What swing speed requires a stiff shaft?
between 97 and 104 mphStiff – This range is still considered fast, but you most likely won't be out on Tour anytime soon. If you're between 97 and 104 mph with the driver, you need a stiff flex. Regular – Now we are getting into the range where a majority of recreational golfers fall, and also where many LPGA pros fall.
Does s stand for stiff shaft?
"S" denotes "stiff flex" (might also be designated "Firm") "X" denotes "extra stiff flex" (might also be designated "Tour")
What do we mean when we say CPM?
Cost per thousandCost per thousand (CPM), also called cost per mille, is a marketing term used to denote the price of 1,000 advertisement impressions on one web page. If a website publisher charges $2.00 CPM, that means an advertiser must pay $2.00 for every 1,000 impressions of its ad.
What does FCM mean in golf?
5.5 is just the flex, the same system is used today. FCM stands for frequency coefficient matched.
What flex do I need for my irons?
Should You Use Regular or Stiff Flex Shafts?6-iron Carry Distance6-iron Swing SpeedShaft flex (all clubs)< 130 yards60 – 70 mphSenior Flex131 – 155 yards71 – 80 mphRegular Flex156 – 175 yards81 – 90 mphStiff Flex> 176 yards91 + mphX-Stiff FlexApr 13, 2021
How fast should you swing a 7 iron?
An average golfer will swing a seven iron about 75 mph. This number can change based on the weight of the club and if it is steel or graphite. The faster you swing a seven iron, the further it will go. If you can swing at about 85 mph, you will see distances closer to 165 yards.
How can I tell my swing speed?
Divide the ball speed by 1.5 to get the estimated swing speed for your drive. Alternatively, you can divide the carry distance by 2.3 to estimate the swing speed at impact, but the result will not be as accurate.
What does S stand for on a golf club?
Drivers are available in a variety of lofts. Wedges typically don't have numbers. Instead that have letters such as P or PW for pitching wedge and S for sand wedge.
Is the S on a shaft senior or stiff?
The typical range of shaft flexes available on the market range as follows: TX (most stiff), X (extra stiff), S (stiff), R (regular), A (senior) and L (ladies, least stiff). Some companies use different denominations such as numbers or colors to denote flex, but golfers are most familiar with the letters listed above.
What is an S flex shaft?
Firm Shaft More commonly known as the stiff shaft (S), this flex is favored by golfers who have a fairly fast swing and drive the ball 250 yards on a consistent basis. Golfers who play a firm or stiff shaft have club speeds between 90-105 mph.
How to tell if your CPM is too low?
If you saw that the shaft was bent backward at impact, that would tell you that the CPM was too low for this club. You must either use a stiffer shaft, or reduce clubhead mass (ie, reduce "swingweight").
Why is the shaft important in golf?
Because the purpose of the shaft is to store energy during the backswing and the beginning of the downswing with the intention that it release energy during the middle and end of the downswing... all with the objective of maximizing the clubhead speed at the moment of ball impact.
Why change the flex of your shaft?
You'd probably elect to change the flex of your shaft rather than the swingweight, because changing the swingweight might also change your degree of comfort with the clubs.
Why does a straight shaft have no energy?
A straight shaft has no stored energy because it has released any stored energy it previously had. Let's apply these concepts to the golf swing. To propel the golf ball as far as possible, you want to deliver as much energy as possible to the ball at the moment of impact.
Why does my 5 iron shaft stick out?
That's because there is no energy stored within it .
How does the club head work on a downswing?
During your downswing, the rotational energy of your body is transferred to the club through your hands and then through the grip and through the shaft, ultimately causing the clubhead itself to begin orbiting your shoulders on its way towards the ball.
What happens if you let go of the clubhead?
That's energy storage! Sure enough, if you let go of the clubhead, it will release that energy and will straighten, albeit after a few wiggles up and down.
What is a cpm?
cpm (cycles per minute) is one way to measure the stiffness of a shaft. 10 cpm equals one full flex, let's say from s to x. With 280 cpm (depending on shaft length and swingweight) your driver seems to be extra (X, probably more) stiff. Going to 275 would make it half a flex softer.
What is the FCM number for a rifle?
5.5, 6.5, etc are Rifle FCM numbers but they've come to be equated with shaft flex as it is more intuitive. They do use a 2.5" clamp so the freq numbers you get from your local clubmaker will probably differ by approx 17cpm as most use a 5" clamp. Fuji and Aldila use something in the 7" range.
What does 5.5 mean on a golf club?
What do numbers like "5.5" and "6.5" mean? A12: A golf club at 43" would oscillate in a frequency analyzer at 255 CPM to be a 5.5 flex designation. A 43" club oscillating 265 CPM would be a 6.5 flex designation. If you drop the "2" in "255" and "265", the relationship becomes apparent. These numbers of 5.5 and 6.5, etc. are all based on a club at 43" and every shorter club of the same flex designation will have a CPM increase of 4.3 CPM per 1/2". Every longer club will have a decrease of 4.3 CPM per 1/2". For example, if a club at 43" were 265 CPM, a club of the same flex designation at 42-1/2" would be 269.3 CPM (265 + 4.3). A club at 44" of the same flex would be 256.4 CPM (265 - 8.6). All three clubs are 6.5
How much bore-thru for titleist drivers?
Correct. Titleist drivers have a bore-thru of about 3.5". (TM blind bore's are only 1.5" to 1.75 inches!!!) 3.5 inches is so much it not only changes the flex drastically, it also changes the characteristics of a shaft. Fuji for instance has a 3 inch long protective sleeve build into the tipps of all their shafts. This alone gives you an idea how much the Titleist bore-thru can change a shaft. (and the reason why Fuji built that Titleist Speeder shaft.) Because of this most Pro's (Titleist does it too) turn it into a blind bore, by leaving a false tipp (cut-off tipp from an old shaft) at the bottom of the bore-thru. Makes it so much easier to keep the flex under control.
Does swingweight make a shaft play weaker?
Yes, increasing the swingweight makes a shaft play weaker.
Is a CPM machine good?
The way i see it, CPM machine is good if you know what you got from that machine and they are only good to build a consistent set . After that is the knowledge of the Clubmaker about every each one of shafts carracter they carry.
How much CPM does a wood shaft gain?
Wood shafts often respond with only 1 CPM for each 2/8", so if we tipped it to the max, 1.50'" we will most likely only see a gain of 6 CPM about 1/2 a flex class, but the shaft WILL NOT feel like that, it will feel "different" and not like a softer version of 1 flex letter stiffer.
Who invented the FCM shaft?
KBS vs RIFLE. Kim Braley was one of the inventors of the FCM system together with his father, so its no surprise he uses that flex system on some of his KBS shaft models, but be aware of that KBS still used "the old system" with a 2.5" inch clamp (and by that different CPM values on the chart.
How many grams is a 42.00 shaft?
Reversed use, you find a 42.00 uncut hybrid shaft thats 80 grams....row 42.00" and 80 grams tells this shaft is 1.91 grams pr inch....and the option to that shaft might be a 41.00 long 80 grams...are they the same weight? NOPE 80 grams as 41.00" say its 1,96 grams pr inch, so if it was 42.00" long like the other, that shaft would say 82 grams.....dont let official specs fool you when you compare shafts, make sure you know GRAMS PR INCH, if you dont, then "grams and grams" can be many different measurements just like SW values, they loose meaning if we dont know the whole story and thats GRAMS PR INCH....
Why is constant weight steeper?
But make no mistake here, Constant weight gets its steeper slope because we dont loose weight when we go shorter, so if we look at the average slopes of 4.33 vs 5.87 the difference is 1.5 CPM who is LOST on the descending weight model, or added as extra wall thickness on the Constant wgt shaft.
What is the slope of a rifle?
From 2012, RIFLE is no longer making woods, and has changed from the 2.5" Clamp to using a 5.0 clamp - New CPM slope is 4.25 CPM between clubs or 8.50 CPM pr inch with the #6 iron as "point zero", since its now all about IRONS, but the actual point zero is a 45.50" long club where the CPM and FCM numbers match up again. 260 CPM at 45.50" is FCM 6.0 when we use a 5.0 clamp.
What is constant wgt?
For CONSTANT wgt (or AMT) we dont have the same "grams pr inch" for all shaft, but the same uncut weight as grams, and variable grams pr inch depending on what shaft in the set.
How long is a BBGM shaft?
If you dont know NET shaft length, its 1.5 to 2.0 inch shorter than the play length of that club (BBGM is typical 1.5 to 2.0" and maybe another 1/8" for grip cap)
What is PCS in golf?
Inspired by the research done by the Braly’s, a club makers organization, the PCS, endorsed and taught frequency based club making to its many, many members. it was a time when shaft design was not as complex as it currently is and when frequency instruments were one of the few tools available to club makers for measuring shaft stiffness.
Who owns Royal Precision shaft?
The Royal Precision shaft company was purchased by True Temper and with that purchase was the numeric stiffness rating patent. Here is a look at how that system is currently applied.
Is shaft frequency used in stiffness?
Shaft frequency is not of much use in evaluating shaft stiffness. The problem for club makers and fitters who recognized the importance of shaft profiling was that there was not an affordable EI instrument until I designed and manufactured one. They used the frequency instruments they had. As with all technologies, instruments and expertise evolves. Frequency profiling and frequency rating of shaft stiffness were an attempt by club builders to reverse engineer shaft knowledge not shared by the shaft companies. Affordable EI instruments have closed the knowledge gap between the shaft engineer and the club fitter.
Who invented the rate of oscillation of a shaft?
Dr. Joe Braly introduced club makers to using the rate of oscillation of a shaft (frequency) to understand its stiffness. In the 80’s he did research on the PGA tour. He used a frequency instrument to measure the shafts used by the tour players. From this research, he developed a formula for the stiffness of ratio of the different irons in the set. The ratio he found was 4.3 CPM (cycles per minute) per one half inch of length of club.
Do golf shaft stiffness rates work across brands?
The systems we have to rate golf shaft stiffness do not work across brands or even across models within brands. Most experienced club fitters use their experience to understand golf shaft stiffness. Many use some systematic method, most often frequency, to rate the shafts they work with.
