Because of the fact that there are various kinds of tennis ball machines out there, it means that there are lots of aspects that you would need to keep an eye out for.
You should ensure that you can get enough practice time with the machine. A good battery life is usually around 4 to 8 hours before you would need to recharge the tennis ball machine.
There are some machines that have programmable oscillation allowing you to produce different shot sequences for your own drills. The higher line machines will allow you to program a change of speed and spin in the oscillation program.
The oscillation refers to the direction of where the ball will be thrown at. The machine is usually had at random, vertical, and horizontal oscillation.
In machines where there are spinning wheels, propulsion spin is made by moving one wheel faster than the other. Topspin and backspin are made this way. The pneumatic machines cannot produce a spin without an attachment.
This refers to the variety of speeds that you can set the machine to throw the balls at and the angles that the balls can get thrown at. Many machines can fire between 10 mph to 80 mph.
The Feed Rate
The feed rate of the ball machine should be about 2 to 10. It should also be accurate and reliable.
You should look at the number of tennis balls that the machine can hold, an average tennis ball machine should be able to hold about 100 balls or more and usually, tennis ball machines that have three hundred balls or more are labeled as professional machines.
The smaller machines are known to be used by younger players and at smaller schools and organizations, while the bigger machines are used in high schools, colleges, country clubs, and even at batting cages.