Ping Pong's arm Robot

[arthura]

Hello everybody,

My team and I are starting to build an arm to play ping pong.

We will need 4 displacements :

• displacement x, on the width of the table, by a rail system

• for the height, by a rail system on a tower

• for the rotation ( in orange on the picture) at the base of the tower

• inclinasion of the raquet ( little servomotor)

  https://lh5.googleusercontent.com/pk9nQKWmGL0HkZAZ49WZSTLpe1-vFnXjNLGyy8jiFFDYhQtebjLynEB9a7rvwjr3wuIHj0NoP1uupeRypX2tB5Gkmtt7RB4NXsZWfb0Jyki6yPLpmCkCzDAInBeh9SYrtcczCOL-"%20width=“602”%20height=“264”%20style="color:%20rgb(74,%20134,%20232);%20font-family:%20Arial;%20font-size:%2014.6667px;%20white-space:%20pre-wrap;%20border:%20none;%20transform:%20rotate(0rad);

The load of the tower would be approximately 3kg and would be 70cm height

The goal is that the arm can go everywhere needed in ~0.8sec. For exemple the width of the table is 1,5m, the robot should travel all of this in max 1sec.

Same thing for the rotation, and for the displacement over the height

A lot of questions growth in my mind :

For the displacement in z, what’s the best ? We are thinking about a gear rack or a belt system
Same for the displacement in x

For the pivot, the axle of the motor can not support the load of 3kg i think, so we need a cool systems with ball bearings, do you have any recommandations ?

I am afraid of problem about stability with this kind of tower, quite thin & tall (70 cm) with the fast displacement over x, any idea ?

Thanks guys to support a newbie in robotics, i know theorical things etc but time to practical !

[arthura]

Here are the axes

[cbenson]

You’ll need something fairly fast with a good reach.
Hobby robot arms are all too slow and short: robotshop.com/en/robotic-arms.html
Professional arms also tend to be based on DC gear motors: robotshop.com/en/advanced-ro … ators.html
We have seen some industrial arms used, but not a lot by the hobby community.

For the displacement in z, what’s the best ? We are thinking about a gear rack or a belt system. Same for the displacement in x

Very good start - it allows for high speed.

For the pivot, the axle of the motor can not support the load of 3kg i think, so we need a cool systems with ball bearings, do you have any recommandations ?

Gear box pan sytems: robotshop.com/en/pan-tilt-se … boxes.html

I am afraid of problem about stability with this kind of tower, quite thin & tall (70 cm) with the fast displacement over x, any idea ?

You’d need to sketch your ideas for us.