wow! next level cue robot!
- Thread starter n_den
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I would describe that as a "stick actuator" rather than a robot. People have shown robots that actually move themselves around the table and look to see where the balls are.
That stroke though; thing of beauty. Gonna try copy that; at least the linear finish.
Wow, that's super impressive. It's the only one I have seen that looks like an actual pool stroke. Smooth and fluid. The machine can adjust speed, stroke acceleration, height, jack-up, squirt compensation, spin, etc, all controlled with motors.
Are English captions doable?
smiling_Hans
Well-known member
My nickname was once The Machine because I had a nice stroke.
This robot reminds me of me.
Perfect your stroke and you can shoot like that.
This robot reminds me of me.
Perfect your stroke and you can shoot like that.
That stroke takes so much "incorrect" backhand it's a risky undertaking. Trying anyway.
@Bob Jewett : Here’s the data from that throw video and some graphs. AI assisted and I didn’t double check everything. I was surprised at the limited throw from follow shots.
And the throw video:
And what ChatGPT says about the data:
Throw in billiards refers to the deflection of the object ball from its expected path when hit with spin or at an angle by the cue ball. This effect is influenced by the friction between the balls and the way the cue ball transfers spin or “english” to the object ball.
Here’s why 30 degrees is significant:
1. Optimal Friction and Spin Transfer: At angles around 30 degrees, the frictional forces between the cue ball and the object ball are often at a maximum. This is because at smaller angles, there’s less side spin imparted to cause deflection (throw), and at larger angles, the cue ball glances off more sharply, reducing the direct transfer of spin.
2. Empirical Studies: Studies and empirical observations in billiards have demonstrated that the maximum throw effect generally occurs at around 30 degrees when no sidespin is applied to the cue ball. Players often use this knowledge to their advantage when aiming for a precise shot that requires the cue ball to make a specific angle with the object ball.
3. Player Experience: Experienced billiard players recognize that shots near this angle are more likely to induce the maximum throw, which they use strategically depending on the situation in the game.
Here’s a breakdown of why lower speeds might result in higher throw:
1. Increased Contact Time: At lower speeds, the cue ball remains in contact with the object ball for a slightly longer duration. This increased contact time allows the frictional forces between the balls to have a more significant effect, transferring more spin or “english” from the cue ball to the object ball. The greater the spin imparted, the more the object ball is deflected from its original path, resulting in higher throw.
2. Frictional Effects: Throw is largely a result of friction between the cue ball and the object ball. At lower speeds, the frictional forces have more time to act effectively. This friction causes more lateral movement (deflection) of the object ball, increasing the throw. At higher speeds, the balls make contact for a shorter period, reducing the amount of frictional force exerted, and thus, the throw is less.
3. Less Momentum Overcomes Spin Effects: At lower speeds, the momentum of the cue ball is lower, meaning it doesn’t easily overcome the side spin or english applied to it. Therefore, the spin has a more pronounced effect on the object ball, increasing throw. Conversely, at higher speeds, the cue ball’s momentum is greater, and it tends to continue along its initial trajectory more forcefully, reducing the effect of spin and thereby decreasing throw.
4. Cushioning and Elasticity: Lower speeds also mean less forceful impacts, which reduces deformation of the balls and the table’s cloth. At higher speeds, the elasticity and bounce-back effects of the collision can reduce the effectiveness of frictional forces, diminishing the spin transfer.
Throw in billiards refers to the deflection of the object ball from its expected path when hit with spin or at an angle by the cue ball. This effect is influenced by the friction between the balls and the way the cue ball transfers spin or “english” to the object ball.
Here’s why 30 degrees is significant:
1. Optimal Friction and Spin Transfer: At angles around 30 degrees, the frictional forces between the cue ball and the object ball are often at a maximum. This is because at smaller angles, there’s less side spin imparted to cause deflection (throw), and at larger angles, the cue ball glances off more sharply, reducing the direct transfer of spin.
2. Empirical Studies: Studies and empirical observations in billiards have demonstrated that the maximum throw effect generally occurs at around 30 degrees when no sidespin is applied to the cue ball. Players often use this knowledge to their advantage when aiming for a precise shot that requires the cue ball to make a specific angle with the object ball.
3. Player Experience: Experienced billiard players recognize that shots near this angle are more likely to induce the maximum throw, which they use strategically depending on the situation in the game.
Here’s a breakdown of why lower speeds might result in higher throw:
1. Increased Contact Time: At lower speeds, the cue ball remains in contact with the object ball for a slightly longer duration. This increased contact time allows the frictional forces between the balls to have a more significant effect, transferring more spin or “english” from the cue ball to the object ball. The greater the spin imparted, the more the object ball is deflected from its original path, resulting in higher throw.
2. Frictional Effects: Throw is largely a result of friction between the cue ball and the object ball. At lower speeds, the frictional forces have more time to act effectively. This friction causes more lateral movement (deflection) of the object ball, increasing the throw. At higher speeds, the balls make contact for a shorter period, reducing the amount of frictional force exerted, and thus, the throw is less.
3. Less Momentum Overcomes Spin Effects: At lower speeds, the momentum of the cue ball is lower, meaning it doesn’t easily overcome the side spin or english applied to it. Therefore, the spin has a more pronounced effect on the object ball, increasing throw. Conversely, at higher speeds, the cue ball’s momentum is greater, and it tends to continue along its initial trajectory more forcefully, reducing the effect of spin and thereby decreasing throw.
4. Cushioning and Elasticity: Lower speeds also mean less forceful impacts, which reduces deformation of the balls and the table’s cloth. At higher speeds, the elasticity and bounce-back effects of the collision can reduce the effectiveness of frictional forces, diminishing the spin transfer.
Totally agree, a very well-done setup. I am surprised they have not done deflection testing already on shafts, or energy transfer tests. This device looks to have a perfect human stroke, including a good follow through.
Thanks for the graphs. I hope the guy with actuator gets up to speed on the stuff that has been done before. Also, he needs to improve his experimental technique to get more useful info from his experiments. I think the balls in the experiment above were pretty slippery because the amount of throw was remarkably small.
On a related point, here is plot I made about 30 years ago. Dr. Dave has since filled in the theory, which explains why there is a break point around 20 degrees and why speed has an effect. He also worked out why draw and follow have less throw than stun. That last fact was the subject of an article I wrote in April 2006: http://www.sfbilliards.com/articles/2006.pdf
Degrees of throw for a frozen pair versus "cut" angle with speed as a parameter:
Here is the English version of the YouTube channel:
Wowzers
No need to battle again ever
Now everyone will jump with the robots on the top of the us open and we all get 50k from crackroom
No need to battle again ever
Now everyone will jump with the robots on the top of the us open and we all get 50k from crackroom
i saw a hint of an elbow drop in shot number 46