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Tennis Ball Machine

Are you a beginner trying to learn the ropes of tennis, or a tennis veteran trying to improve your game? If so, then maybe you could improve with the aid of a tennis ball machine. A tennis ball machine is a device is set up on the opposing court and acts as a server, serving tennis balls for you to return. Tennis ball machines can vary price based on a number of different factors such as size, speeds, ball capacity, oscillation and many other features.

When looking at a tennis ball machine, the first thing that comes to mind is, “Wow, those things look way to expensive for me.” The truth is that a lot of tennis ball machines can be purchased on a budget of less that 0.00. If you have a budget significantly higher than 0.00, then there are more advanced machines that can be purchased, some running between ,000 and ,000.  However, some of the more expensive machines are entirely unnecessary for individual use; depending on your budget, you should look for a tennis ball machine that fits your needs but does not exceed them with all sorts of unnecessary features.

There are so many different features that are associated with tennis ball machines, varying depending on how nice the tennis ball machine is. One feature is adjustable speed settings, typically meaning that you can adjust the tennis ball machine to serve as slow as 15 miles per hour to as high as 95 miles per hour. Some tennis ball machines boast an oscillation feature which means that you can set the machine to serve each ball at a different location each time. Some machines also allow you to set different heights and change the serving intervals, while some have long lasting battery life and can even are remote controlled depending on what you get.

If you are a beginner at tennis, then you should set the machine up to serve the ball in one location because you may not be apt to handle running around and returning the ball. You may also want to set the machine to serve the balls at a slow to moderate speed, because if you are not ready for a 95 mile per hour serve then the machine could become dangerous, so try slower speeds before you advance to higher speeds. If you are already pretty good at tennis, then having the ball served in different locations and at different angles may prove to be an advantage; you may also be able to handle a faster serve. It all really just depends on you and what you can handle; you just need to know what your limits are.

A tennis ball machine can help you learn the game of tennis or help you improve your game, regardless of the reason; a tennis ball machine is always a great investment if you can afford it. Some tennis ball machines can hold a large amount of tennis balls, which can prove rather expensive when you have to buy the tennis balls; so try and see of you can make a deal with the person selling you the tennis ball machine to see if he or she will throw in the tennis balls. Now get out on the court and play a round

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An Introduction to Golf Ball Dimples

Golf Ball Dimples

 Knetgolf is the world’s largest internet retailer of premium used and recycled golf balls. Each of our golf balls are cleaned and hand sorted, selling you the top 10%. With over 200 different types of balls, Knetgolf has satisfied over 200,000 customers annually and has a 100% satisfaction guarantee. In order to help you better understand the science behind the ball, Knetgolf has written a short, in-depth article about dimples

So what is a golf ball dimple? Dimples are small indentations on the surface of the golf ball.

So, just How many Dimples are there on a Golf Ball?

Well, the number of dimples on a typical golf ball is generally 336 but, the number of dimples on a golf ball can range anywhere from 300 to 500 depending upon the golf ball, manufacturer and dimple design.

Golf Ball Dimple Shape, Alignment and the Dimple Effect

Though the swing of the golf club provides the impact, it’s the design and construction of the golf ball that makes it go. Golf balls with a harder core (high compression ratio) travel further because they deform less upon impact and produce a greater transfer of energy. And then where the dimples come into play.

The dimples on a golf ball may vary in size, shape, depth and configuration, they all share a common purpose to provide longer and higher flight to the ball. A dimpled golf ball can travel two to three times as far as the same ball with no dimples. The dimples allow air to flow over the golf ball, providing less drag. Also, hitting a golf ball results in a rapid backspin, this forces airflow downward and creates an opposite upward force that provides lift.

Why do Golf Balls have Dimples?

Golf ball dimples refer to the depressions on the surface of the golf ball, which have a significant effect on golf ball lift and how far a golf ball travels. This fact has prompted a great deal of research on golf ball dimple shape and alignment. In recent years, golf ball manufacturers have even introduced “dimple plus” alignments, in which seam lines have been eliminated.

 

Dimples on a regulation golf ball differ greatly from one golf ball manufacturer to another, as well as the impact they have, depending on dimple alignment and the depth of the dimple depressions.

Dimple Configuration shown to the left, is an Octahedral 392 dimple configuration and an Icosahedral 432 dimple configuration respectively.
 

Golf Ball Dimples Increase Lift and Reduce Air Resistance

Dimples marked onto the surface of a golf ball are not simply for decorative purposes. Golf ball dimples play a major role in determining the distance traveled by the golf ball. Two of the principal effects of golf ball dimples are to increase lift and reduce air resistance, which results in longer distances traveled and greater stability in shot trajectory. Although golf ball dimples appear to be all alike to the untrained eye, they do in fact come in a variety of dimple patterns.

Their impacts differ depending on dimple alignment and the depth of depressions. The number of dimples on a ball is also a consequence of alignment and depth. The number of dimples generally range between 350 and 500 dimples per golf ball, their numbers do not significantly affect distance.

Ideally, dimples should be spread evenly across the surface of the ball in recurring combinations of one shallow and one deep dimple. If this cannot be done with precision, golfers will lose distance on their shots, or find them veering to the left or right – even on shots where the ball has been hit squarely on center.
 

Effect of Dimples on Golf Ball Distance and Trajectory

The discovery of the effect of dimples on golf ball distance and trajectory was almost by accident back in the mid 1800’s. It was discovered that golf balls with improperly smoothed surfaces often flew straighter and further than their smooth counterpart. Thus the “Hand Hammered Gutta- Ball” was formed. These golf balls were hammered by hand with a consistent pattern using a sharp edged hammer.

Dimples and the Boundary Layer

We have known since the mid 1800’s that dimpled golf balls fly much further than smooth golf balls. The boundary layer is the thin layer of air surrounding a golf ball as it flies through the air. In the boundary layer, the speed of the air varies from where it contacts the air on the surface of the ball (which is not moving relative to the ball), to where it contacts the mainstream airflow, at the outer edge of the boundary layer.
 

 

Golf Ball Dimples Increases Lift

On a golf ball hit with back spin, dimples will cause currents of air moving above the ball to move faster, thus lowering air pressure and promoting lift.

Golf Ball Dimples Reduce Air Pressure

Dimples facilitate the movement of air to the back of the ball, preventing the reduction of air pressure behind the ball. This lessens the amount of air pressure pulling toward the rear of the golf ball.

Golf balls without dimples produce no lift, and fail to travel for any significant distance because they are unable to rise to any significant height in their shot trajectories. As dimples are made shallower, trajectories tend to rise, while the deeper the dimple the less the trajectory.

In order to make a typical golf ball travel up to three times the distance with dimples than without, there is an ideally appropriate dimple depth that must be provided.
 

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Golf Ball Technology by Knetgolf

Golf Ball Technology

Knetgolf.com is the world’s largest internet retailer of premium used and recycled golf balls. With over 200 different types to choose from in different grades, Knetgolf offers a rich variety when choosing your recycled ball. But what about the science behind the golf ball? The application of hi-tech science and technology has lead to the high-performance golf ball and the game of golf we play today.

Golf Ball Design

The business of golf balls is not open ended,  as the characteristics of golf balls are strictly governed by rules. These rules determine such things as:
• Golf ball weight
• Golf ball size
• Maximum initial velocity
• Spherical integrity and symmetry
• Combined carry and roll of the ball

These and other characteristics make up the framework that today’s golf ball manufacturers work within as they vie technologically for sales and market share. The expression “a golf ball is a golf ball is a golf ball”, simply does not apply. What appears to be just a small round object is in fact the product of many current leading-edge technologies.

Golf Ball Structure

Golf ball structures break down broadly into two basic categories: wound golf balls, which are the all too familiar conventional golf ball structure we all grew up with, and the solid golf ball which made its appearance in the 1980s. Ever since Bridgestone introduced the popular two-piece Altus golf ball back in Japan back in 1982, solid balls have achieved rapid penetration. Solid golf ball structure is now at the peak of its popularity, accounting for 95 percent of all golf balls sold in the Japanese market.

Wound golf ball structure is a direct descendant of the Hasket ball, invented in 1898. Solid golf ball structure on the other hand, has evolved from the one-piece golf ball that was first invented in 1966. Until recently, the general opinion among golfers has been that solid balls produced a hard feel upon impact, and that they offered poor spin control and over all performance. However, with the development of golf balls made of urethane resins, the ratio of professionals using solid balls at the 2000 US Open reached a striking 30 percent.

As such examples indicate, golf balls have evolved and are being improved in ways that increasingly meet golfers’ needs. Learn more about the Evolution of Golf Ball Construction.

Golf Balls, Golf Balls and more Golf Balls

There are more than 1,500 different kinds of golf balls that have been approved by the R&A and USGA. In addition, there are a large number of unproved golf balls available on the market as well. A typical golfer today can easily find a golf ball that has made the kind of progress expressed above.

The real message is that golfers should take the intuitive to try new golf balls, rather than staying with the same old golf ball experience. Today’s golf balls are different, no doubt about it, so take advantage of the technologies that are available to improve your golf game. By this — is meant simply that by experimenting with some of the many different golf balls available today, one may discover golf balls that more closely fit the style of your golf play.

The R&A and the USGA…

The R&A is golf’s world rules and development body and organizer of The Open Championship. It operates with the consent of more than 125 national and international, amateur and professional organizations, from over 110 countries and on behalf of an estimated 28 million golfers in Europe, Africa, Asia Pacific and The Americas (outside the USA and Mexico).

The United States Golf Association (USGA) is the game’s governing body in the United States and Mexico.

Golf Ball Rules

Yes, when it comes to the game of golf, the golf ball rules! However, that’s not quite what we mean when we say Golf Balls Rules.

With the rapid advancement of golf ball technology, there must be a limit to how technologically advanced one can make a golf ball. The USGA has set several guidelines regulating the construction and design of golf balls. To be recognized and approved by the USGA, a golf ball must meet the following standards:

Golf Ball Weight:
According to the USGA Rules of Golf, the weight of the golf ball shall not be greater than 1.620 ounces avoirdupois (45.93 gm).
The heavier the ball (to a point) the less it can be slowed downs by air resistance and therefore the further it would tend to fly. Hence the majority of the manufacturers produce golf balls with the maximum allowed weight of 1.620 oz./ 45.93 g.

 Golf Ball Size:
According to the USGA Rules of Golf, the diameter of the ball shall not be less than 1.680 inches (42.67 mm).
A smaller golf ball will generally fly further than a larger one given the weight is equal. The reason for this is: having a smaller diameter ball means less air resistance. Moreover, the majority of the manufacturers produce golf balls with the minimal diameter of 1.680 inches / 42.67 mm.

 Spherical Symmetry of the Golf Ball:
Golf balls must not be designed, manufactured or intentionally modified to have properties which differ from those of a spherically symmetrical ball.

 Golf Ball Initial Velocity:
The initial velocity of the ball must not exceed the limit specified when measured by the USGA.

 Golf Ball Overall Distance Standard:
Overall Distance Standard for golf balls is on file with USGA.
For the most part, all balls sold in the United States meet the above criteria and earn a place on a document known as the United States Golf Association (USGA) Conforming List — which includes many hundreds of models of golf balls.

 As you can see, the technology and process behind the seemingly-simple golf ball is complex.

 That tiny ball you hold in the palm of your hand is the product of centuries of experimentation and testing. Makes you appreciate it a little more, doesn’t it?

 

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Related Golf Articles

A History of the Golf Ball, by Knetgolf

Knetgolf.com is the world’s largest internet retailer of premium used and recycled golf balls, carrying over 200 different types of balls. But how did these balls come to be? What is their history?

The common golf ball has undergone many upgrades and enhancements throughout its long life. With the first recognizable form of the game of golf being played in Scotland in the early 1400’s, the golf ball has had nearly 600 years to evolve.

The evolution of the golf ball highlights the major changes in the game of golf and depicts important golf landmarks during the long evolution of the game. The development of the golf club, the golf course, and the rules of the game were affected by the evolution of the golf ball itself. The balance (and debate) between technology and tradition is as old as the game of golf itself. One can even argue that when it comes to golf, yesterday’s technologies are today’s traditions.

Today, 50 million golfers worldwide play 900 million rounds on some 25,000 golf courses each and every year. Clearly, the game of golf has become incredibly popular, and the resulting industry is big business.

Four Stages in the Evolution of the Golf Ball

Although it is likely that the very first golf balls were nothing more than round rocks or pebbles, there are four distinctly recognizable stages in the evolution of the golf ball:
 
 
Wooden Golf Balls

There is no question that the first games of golf, as we know it today, were played using wooden golf balls. Wooden golf balls were the first man made golf balls, and although information is scant, it would be a pretty safe bet to assume that a wooden golf ball had some rather interesting playing characteristics.
 
 
Harboring their roots in the early 1400’s on the Eastern Coast of Scotland, these original wooden golf balls were inefficient at best and likely made of hardwoods such as Beech or Boxroot. Wooden clubs were the golf club of choice, which in conjunction with the wood balls would have made your friendly game of golf a rather jarring experience.

Wooden golf balls were used up until the seventeenth century, when the feathery ball was invented.
 
 
Feathery Golf Balls (Feather Stuffed Leather Covered Golf Balls)

The first “real” golf ball was known as a “feathery”golf ball. Basically, the feathery was a leather sack filled with boiled goose feathers, then stitched up and painted. Feathery golf balls were expensive to make easily damaged and only the privileged few could afford to use them.
 
 
Although the era of the feathery golf ball may have started in the early 1400’s and run until the late 1840’s, it is believed that it was in 1618 that a new type of golf ball was created by handcrafting a cowhide sphere stuffed with goose feathers. The feathery golf balls were manufactured while the leather and feathers were still wet, and as the leather shrunk while drying, the feathers expanded to create a hardened, compact ball. The Feathery was then painted and sold, often for more than the price of a golf club.

The time-consuming processes involved in creating a Feathery golf ball ensured that the price was out of reach of the masses. Though expensive, this type of ball had great flight characteristics and made the wooden ball virtually obsolete. For some three centuries the Feathery was the standard, only to be replaced with the advent of the Gutta Percha ball.

Amazing longevity when you consider that:

It took a bucket of boiled goose feathers to make a single Feathery golf ball.
A skilled Feathery golf ball maker could only produce about four of them in a day.
It was virtually impossible to make a truly round Feathery golf ball.
A player may have gotten as few as 2 rounds out of a Feathery golf ball.
If gotten wet, the Feathery golf ball would come apart.
It’s hard to imagine being able to keep any type of golf ball dry during a round of golf on the Scottish links.
 
 
Gutty Golf Balls

It wasn’t until 1848 that Rev. Dr. Robert Adams began creating golf balls out of Gutta Percha “Gutty”. The Gutty golf ball was created from the dried sap of the Sapodilla tree. It had a rubber-like feel and was formed into ball shapes by heating it up and shaping it while hot.
 
 
The arrival of the gutta percha ball or “gutty”, as it was called, revolutionized the game of golf and allowed its spread to the masses. The gutty period lasted from 1848 until the late 1890’s. A mere blink of an eye when compared to the feathery, but the Gutty had a much greater impact on the game of golf, due to its affordability, playability and durability.

The first Gutty golf balls were hand made, formed smooth and wore three coats of paint. But then it was discovered that brand new guttys had more of a tendency to duck than those gutties scuffed up from play. Hence the practice of nicking the balls with a hammer. That’s right, almost by accident, it was discovered that golf balls with improperly smoothed surfaces often flew straighter and further than their smooth counterpart.

Thus the “Hand Hammered Gutta Ball” was formed. These golf balls were hammered with a consistent pattern throughout with a sharp edged hammer. Dimples were incorporated into the iron molds that followed. Less paint was also discovered to be beneficial, and paint application was reduced from three to two coats.

Learn more about Golf Ball Dimple Shape, Alignment and the Dimple Effect.

Handmade Gutty Balls soon gave way to metal presses which in turn made golf affordable for the lower income golfer. Golf truly became the sport for the masses. “The Bramble” design, with its minute bulges resembling a Brambleberry, became the most popular design of the Gutta Percha era golf ball. The Brambleberry pattern was even carried over into a few brands of the more recent rubber core golf balls.
 
 Rubber Core Golf Balls

The advent of the rubber core golf ball changed the face of the game of golf as we knew it. This new design was invented in 1898 by Coburn Haskell in association with the BF Goodrich Company. This new and unique golf ball construction and design featured a solid rubber core, high tension rubber thread wrapped around the core, and a Gutta Percha cover.
 
 
The more modern rubber core golf ball replaced the gutty in 1899. However, the rubber core golf ball of the day did not meet with immediate success. Golfers complained that while the rubber cored golf balls were longer off of the tee they were far too lively on and around the greens. Once Walter Travis won the U.S. amateur golf championship while playing with one, the gutty ball soon became obsolete.

This new breed of golf ball also featured a much larger variety of outer designs for improved airflow. The mesh, reverse mesh and Bramble designs gave way to the dimple pattern first used in 1908.

Exhaustive golf ball design testing has been done with a multitude of different cores. At one point, a small sac of water was substituted for the rubber core. Steal, lead and glycerin were tried to no avail. Eventually, most golf ball manufacturers settled on one form of rubber or another. The composition of the rubber used is a closely guarded trade secret. Rubber thread was wound around the rubber core, as tightly as possible and a cover of Balata was applied.

Continued Evolution of Golf Ball Design

Today, two piece solid Syrlin covered balls are more popular with amateur golfers, as they tend to be more durable than Balata. Syrilin golf balls are longer and straighter as well. Many pros however, are still devoted to the soft and lively Balata balls, since they can get the distance needed and prefer the added spin for control.

Currently golf ball technology has reached new levels of design. Still closely guarded, top golf ball manufacturers such as Callaway, Titleist, Pinnacle, Nike and others compete within a multi million dollar year industry for their due market share.

There is no question that the application of hi-tech science and technology has lead to the high-performance golf ball and the game of golf we play today.

Golf Ball Design and the USGA
The business of golf balls is not open ended, the characteristics of golf balls are strictly governed by rules. These rules determine such things as:

Golf ball weight
Golf ball size
Maximum initial velocity
Spherical integrity and symmetry
Combined carry and roll of the ball

These and other characteristics make up the framework that today’s golf ball manufacturer’s work within as they vie technologically with each other. The expression “a golf ball is a golf ball is a golf ball”, simply does not apply. What appears to be just a small round object is in fact the product of many current leading-edge technologies.
 

Knetgolf carries over 200 different types of golf balls, in most brand names and in mint condition. You can get 50-80% off factory price. Check it out!

This week until Tuesday, get 25% off all your favourite golf balls at Knetgolf.com, using promo fall25.

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