Tennis ball machine DIY - part 1
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- Опубликовано: 10 ноя 2013
- To watch Part 2 (multiple features added) go here: • Tennis ball machine DI...
Proof of concept prototype of my tennis ball machine. Works pretty well, but wheels have to be better balanced, there's too much vibration currently. Expect more videos - this is a build log!
Music:
"Slow Burn" Kevin MacLeod (incompetech.com)
Licensed under Creative Commons: By Attribution 3.0
creativecommons.org/licenses/b... 
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Hello. congratulations for the great work you have done. I'm making my tennis ball machine, and I wanted to ask you if you're kind enough to give me some little advice. what distance is there between the wheels? what engines did you use? thank you very much and congratulations
Hello, could anyone tell me what sized wheels he used in this build? What batterys were used to power it? Thanks.
Deciding on ball feed mechanism. Thinking feeding balls down a twirly tube and a simple latch actuator to let one ball fall to the wheels every 2 sec. Rather than a tub with rotating discs .
Hi, Buddy
First of all. congrats your project is really nice.
I've trying a similar one. Cheap and fit also but my prototype I put a DC motor not a brushed one. So I would like to no how many RPM you set for a topspin backcourt?
Thanks
what type of wheels are you using and how did you get them? Also how did you connect the wheel to the motor ?
hello friend! Waiting for part 3! Could you please inform the specs for the motor used on the ball feeder carrousel ? Tks!,!
hi!, what kind of dc motors did you used? there are equal? could you specify the rpm, operating voltage and kind of source?(it looks like DC)
hello, can you tell me where did you buy your wheels please? Nice work! Thank you
Great project. I'm training myself. Would you kindly share the project then I can make one for me?
Thank you
Hey,
Can you tell me which software you used to design the machine?
0bo0 this is awesome! Do you have a list of the components you have used? (Motors, arduino? and more)
Do you have the schematics and the parts list available?
Hi!!! Great project and I’m to follow yours between others I had watched on tube.
can I ask you if you have decided to share the project? I’m in trouble with the structure and the motor shaft. can you help me?
NİCE. Is there a site where you can get the engine you are using?
How did you connect your motor shaft to the motor? Can you please provide part no for the shaft adapter? Thank you.
hello, could u tell me what material did u use for ur project.
One more question: What kind of wheels are used for this?
hello, i am on a similar project and working on the sizing of a tennis ball launcher could you inform me on which motor you are using for this project or how to design the pucks please?
What materials did you use to connect the motor to the wheels??
what is the rpm of the wheels, how big is the wheel like the diameter and the thickness, what type of batteries are you using and can you please give more info? please answer my questions this will help a lot thanks
by the way, I would like to buy the engines you used to create the tennis paddle. Thank you
Hi BO,
Could you please provide exact motor name and specification so that we can search for it? or if you can provide link that would be awesome.
Hi friend, can I ask something a lit bit technical? The DC Motor used is a high tork, I belive it´s 2.42N.M . My question is, what´s preferable here, Tork or High RPM?
very well done!
Great work mate, what motor is it though?
Hey could u tell me the rated current of this motor(first cim 5280)?So I could estimate the time it lasts.
Hi, nice prototipe, i'm spanish, can you give to me the cad file and the type or reference and specs of the motors and wheels?? I'm interested in that. Thanks.
what program did you use for the animation demonstration?
How did you bind wooden discs and motor shaft ?
What software are you using for the 3D modelling?
Magnificent! What engine is used?
what motor you use in this project
Nice creation
Fajna maszynka. Potrzebuje silnik do takiej maszyny. Czy możesz podać dane silnika?
Hi, are you able to tell me the sizes of this? I am having to build one similar
Can you have specification of motors?
which kind of motor do you use give the price of it
how did you mount the motors to the frame
Did you share the inventor files at any point? please let me know. thanks
Wondering if washing machine motor with gears will work?
good way to lose fingers
Yes. To feed with hand is extremely dangerous.
I attached a tube to the mills so i don't feed it directly with my hands
Yes bro
ahahah can't stop laughing... you gotta be a commedian
Qual a rotação deste motor?
Hi is the mounting plate self made?
What type of motors did u use?
is the motors both called the 63ZYT01B ?
bro I don't have this type of motor can I use do motor plz tell me what voltage of dc motor
what material are the wheels made out of?
good evening, at how many rpm should the engine run at maximum?
Motor specifications bro like cost speed hp etc??? Plzz
How many RPM and which DC motor you have used?
Can you tell me what brand wheels those are?
sir how much rpm did you use and what is the wheel diameter?
Dear, please...what is motor Electric specifications?
Thank you for your great work.
I have an inquiry about the motor shaft.
Did you replaced a motor shaft to a longer one or used a coupling to extend it?
Furthermore, how did you fasten the wheel and the shaft?
Thank you for reading it.
Waiting for your reply.
Heejin Kim thank you. I used this custom adapter imgur.com/POTDarx
so glad that guy told him to get the angle of the other side of the net
which other motor can I use
Where can i find similar spinning wheels?
what motors did you use?
I search on net about the batteries that you mentioned but they are very big in size as compared to tou
GRACIAS champion felicidades EXCELENTE
Can u tell how to make the tennis ball launcher?
What was the width of the wheels?
Hello, impressive work!
How do you control the speed or the rpm of each wheel? Need help ASAP :S
Thanks!
Speed controller connected to the motor.
Which battery did you use
sir can you give the RPM details used in each wheel..
hi, can you tell me motor's rpm?
Are your selling?
Fantastic creation....Can you please advice what is distance between wheels in mm and what are specification for Motor ?...Thank you very much
Thank you. 38 mm on the outside and about 42 in the middle, but I'd recommend making the distance adjustable. Search for "First CIM motor" to find the spec
Hello,
Fantastic work getting the machine rolling. I have started building one for the school. I have a 12v 6000 rpm , shaft length 15mm, shaft width 6mm. would this motor be sufficient?
+Arjun S I built one pretty similar with 12v 6500 rpm motors and it works great, so I'd imagine yours would too. If you want to see mine, here's the link: ruclips.net/video/NclLwH7eyns/видео.html
Hi, I am an engineering student and if there is any way I could contact you about your design please let me know
Wheel barrel tires are good, and small trailer tires also, I would recommend a feeding tube so hands don't get so close to them spinning tires, could be a ugly accident if your hand was to get sucked in 👍🤝✌️
looks dangerous ^^
Wow....part three may be on a gore site when his hand gets caught in the machine.
Hello, I wanted to know what kind of motors do you use in your machine(the specifications) and also the material of your weels
12v 2.5" body CIM motors, available from andymark.com
When I was making mine I couldn't find the material he used for his wheels so I ended up getting some bench grinder wheels that were rated for use up to 9000 rpm. Worked pretty well! If you want to see it, here's the link: ruclips.net/video/NclLwH7eyns/видео.html
@@Hyratel I knew those were frc motors !
complimenti ottima idea ....ma non riesco a trovare i motori ...
What kind of motors are you using?
Is it possible to get their catalog number?
They are CIM motors
buen dia queria saber si hicieron el video 3 para ver como coloca la torre de pelotitas
Hi 0bo0,I'm working on an automation project for a machining class I'm taking. I was planning on making a tennis ball launcher for dogs, and came across this video. This is an awesome/ reasonably simple design concept! I didn't know what the possibility of me getting some dimensions from you was? I have to use AC motors and have to have three pneumatic moves. So there will be design differences I will figure out, but I have no clue where to start :). I'd appreciate any help! Thank you!
What motor?
What is the name and the price of the motors?
Where did you buy them from?
1000
Motor specifications:
Speed: 10.000 rpm
Torq 0.4~4kgf.cm a 5
HP 0,13
Voltage 12V
Power 97W
Current 8 Amps
CIM motors
Where to buy
Mes gustaria saber características de los motores dc,gracias
Loved this! How much space have you left between the two wheels?
+Esas Khan I did one pretty similar to this and I left 34mm (half the diameter of the tennis ball). If you want to see it, here's the link: ruclips.net/video/NclLwH7eyns/видео.html
Bro can you tell what material you choose for the rotating friction wheels ?
check out my Tennis Guru machine ruclips.net/video/KmExDzfhoc8/видео.html
Hi, great job first of all...
Could you please tell me how much is the diameter of the wheels and the axle spacing?
Hi, thx. Diameter is 195mm. I can't measure spacing right now, but it's between 35-45mm. Ball has to be squeezed to achieve high velocity.
0bo0 Thank you, that's what I thought too... So the ejection speed of the ball is given both by the wheels rotation speed and by the squeeze energy right? What's approximatively the range of rotation speed for the wheels? I'm doing a research on tennis machines for my University :)
lk533 I think that the greatest benefit from squeeze is increased friction and contact time between ball and wheels. If a ball doesn't slide during the contact, the speed it gets more closely matches linear velocity of the surface of the wheel.
Maximum rotation speed this machine can achieve is over 5k rpms (depends on battery voltage). Such speed require perfectly balanced wheels. Mine are usable up to 3-3.5k currently.
0bo0
ok thank you very much! I'll be maybe back for further informations if you don't mind :)
Wheel name is what
Hello BO.
First of all, congratulations for your project. It's really cool and well made. So, I'm building a machine too. I don't have the same skills in eletronic and mechanic as you, but, i'm trying really hard with some help of a friend. Maybe we can share some knowledge? I have some questions for you:
1) I'm thinking of using EVA wheels (ethylene-vynil acetate). Its very light and very strong. Maybe it makes the autonomy of batteries longer, cause the motor uses much less force... I'm trinking in MDF only as the axis for the wheels. What you think? This really can influence the autonomy of batteries?
2) How you imagine the mechanism to feed the machine with the balls? I'm thinking in a microwave motor (low RPM) vertically disposed in a PVC pipe. It slowly rotates and liberates the ball. What you think? (sorry for bad english... i'm from Brazil). Thanks man!
Hi vexguine,
1) I don't have experience with EVA, but if the wheels have required shape or can be modified then why not to try. I also wanted to use wheels but couldn't find any that would be good for this (wrong size, expensive, heavy, unavailable at my location etc).
2) ruclips.net/video/ETSEuE0CJl8/видео.html check this video for inspiration. I think that good feed mechanism is the most difficult part of the machine.
0bo0 Thanks for the answer. Very inspiring video too. Lobster machines are great but in my country it is very expensive. I could say that the prices of a "chinese" machine is barely a robbery. American machines can cost $ 4.000!
That situation gave me the idea to project a machine for personal use. Now my friend is thinking in commercial purposes for the local market. I dont know..
So, I tried with EVA and the result is very good! Very solid and strong wheel.
Thats it. As soon as I have a good machine to show I will post a video. Bye
0bo0 So, please, one more info:
It is difficult to find a good torque/rpm ratio... wWhat we look in the motors here? A 300 rpm/2 kg.cm motor can handle the work? Thanks a lot. Its the high RPM absolutely needed?
hello sir, can you give me the mechanism of this. i am doing a project with it :D it is so nice if you can do me a favor:D
can i know the voltage and model of the motor and size of the wheels
Motor: FIRST CIM (?) 12V 5280RPM, diameter of the wheels ~190mm
What kind of material did you use for the wheels?
great
Hi could you please tell me what motors you use for this? It would really help for my uni project. Thanks
Hi. Sure, search for "cim motor".
@@0bo0 can you plz make a new and detailed video of this project
send me one please! great work.
Que motores son?
what motors did you use ? Thanks
775 motor
Hello, were you able to compute the speed of the ball in the CAD software ?
Hi,
max speed can be easily calculated from rpm and wheel diameter, but actual speed is much lower due to low friction between wheels and ball, ball squeeze, etc. Maybe someone who uses such software regularly would be able to simulate this, but I wasn't.
@@0bo0 Hi,
first of all congrats for your amazing project and thank you very much for sharing your 2 videos.
Technically delightful : closed loop speed control, bluetooth bidir communication, slope control,...
I’m working on a similar DIY project, and would like to share with you some considerations on the *ball speed* leaving the ball machine, compared with *engine RPM*,
In video n° 1 (1:20) , ball is flying from the baseline to first quarter of the field (approx 18m), taking off with a slope of about 15°.
Considering usual kinematic laws, the ball speed should be something 18 ~ 19 m/s.
IF( !) the ball and the wheels WOULD have perfect friction, they would have the same linear speed at shooting time…. with a diameter of 190mm, this lead us “just” to ~1900 rpm….
BUT you are using an engine of 5300 rpm ( much more than 1900 rpm!)
My *questions* are:
-WHAT is the “normal” rpm speed are you using for the “flat shot” from the baseline ?
-Have you considered a different wheel material to increase friction ?
BR
@@Giuliano1969 Hi Giuliano, thanks for the comment. I haven't used the machine since long time ago and cant answer your question about rpms (3-4k?). Definitely had to be much higher than what I was getting from a simple calculation. My plan was to put an continuous closed band cut out of an inner tube from an old car wheel onto machine wheels to increase friction. Having a closed rubber loop would make it more safe in comparison to a strip glued onto the surface. Another improvent that can be done with the stuff easily available today would be replacing attitude control dc motor with a stepper, use a screw with a trapezoid thread, and absolute rotation sensor (hall effect) instead of a potentiometer (or just add an endstop and perform homing procedure each time the machine is switched on, then count steps).
We need to know the motors and its specifications. Please!!! TA!
How long will your batteries last before they run out and need to be charged? Thanks
Depends on many factors, in my case with fresh batteries it should theoretically work for almost an hour. Currently I use old batteries from UPS (see 2nd video) which have only one third of original capacity and that gives 15-20 minutes.
hi, are you still working on this project? What is the diameter of the wheels? Are they made of wood?
Hi, I have a progress but not enough to upload a new video (there's part two, don't know if you saw it). Diameter is ~195mm. They're made of MDF (medium density fibreboard).
0bo0 Do you know to say what is the optimal distance between the wheel?
Is it the Ball diameter or Less?
OboO can you plz tell wich type of motor you have used in this
Sure, search for "FIRST CIM motor"
Where did you buy the motors and batteries
Check this link out. This solves a lot of problems with the machine. ruclips.net/video/KmExDzfhoc8/видео.html