Welcome, Guest. Please Login
SLINGING.ORG
 
Home Help Search Login


Pages: 1 2 3 4 5 
Send Topic Print
Roboslinger! (Read 2057 times)
Curious Aardvark
past-administrator
*****
Offline


Taller than the average
Dwarf

Posts: 13965
Midlands England
Gender: male
Re: Roboslinger!
Reply #45 - Apr 24th, 2018 at 6:54am
 
lol was thinking that.

On the other hand it's a really neat compact throwing device.
Getting a trebuchet - of any type - to simulate a sling throw is always going to be really difficult.

This looks easier to adjust than a standard treb, and easier to build, transport and store.
Plus the windup for the actual sling is far more like a slinging windup than a standard trebuchet.

Very very interesting.
Back to top
 

Do All things with Honour and Generosity: Regret Nothing, Envy None, Apologise Seldom and Bow your head to No One  - works for me Smiley
 
IP Logged
 
NooneOfConsequence
Slinging.org Moderator
*****
Offline



Posts: 2993
Texas
Re: Roboslinger!
Reply #46 - Apr 24th, 2018 at 9:08am
 
Mersa wrote on Apr 24th, 2018 at 5:02am:
Very impressive but how do we apply this to slinging?


... you’ll see  Wink

That multi-arm cam system on the murlin allows you to tune the acceleration profile of the sling to some degree. A slinger can feel the stretchiness of the sling as it swings around and can respond in subtle ways a treb can’t, but a Murlin style treb is more tunable than a standard trebuchet.

The goal is not to exactly replicate human throwing. Instead we really want to use a simplified but consistent thrower to study slinging and improve both human throwing techniques and sling designs.

A treb lets you study the effects of sling stretch, pouch geometry, release timing, projectile spin, and so on. These are things most trebuchet builders don’t pay attention to because they are focused on maximizing distance only.
Back to top
 

“My final hour is at hand. We face an enemy more numerous and cunning than the world has yet seen. Remember your training, and do not fear the hordes of Judas. I, without sin, shall cast the first stone. That will be your sign to attack! But you shall not fight this unholy enemy with stones. No! RAZOR GLANDES!  Aim for the eyes! May the Lord have mercy, for we shall show none!“  -Jesus the Noodler
 
IP Logged
 
Sarosh
Interfector Viris Spurii
*****
Offline



Posts: 1183
Re: Roboslinger!
Reply #47 - Apr 24th, 2018 at 11:48am
 
NooneOfConsequence wrote on Apr 24th, 2018 at 9:08am:
sling stretch, pouch geometry, release timing, projectile spin, and so on.

i'm really interested in sling stretch and spin orientation! Cheesy

but with such devices we can't learn a lot about what movement to perform to impart the most energy into the projectile (move our body efficiently) and what technique is better suited to different body types. Sad
Back to top
 
 
IP Logged
 
NooneOfConsequence
Slinging.org Moderator
*****
Offline



Posts: 2993
Texas
Re: Roboslinger!
Reply #48 - Apr 24th, 2018 at 12:45pm
 
Sarosh wrote on Apr 24th, 2018 at 11:48am:
NooneOfConsequence wrote on Apr 24th, 2018 at 9:08am:
sling stretch, pouch geometry, release timing, projectile spin, and so on.

i'm really interested in sling stretch and spin orientation! Cheesy

but with such devices we can't learn a lot about what movement to perform to impart the most energy into the projecthttp://slinging.org/forum/yabbfiles/Templates/Forum/default/right.gifile (move our body efficiently) and what technique is better suited to different body types. Sad


I think there will be something for all of us to learn, but it certainly won't eliminate the need to practice.  That would take all the fun out of it anyway Smiley

There is plenty of info about optimizing energy transfer on the physics side, and while every body is different, muscles and nerves do behave in similar ways for most people.  There may still be things you can do with techniques or sling design to dial in your own throwing performance based on problems that you might observe when compared to the roboslinger's behavior under various conditions, but to get detailed information about a specific person, you'd probably have to use a motion capture system and do a lot of analysis.

Ultimately, we'll just have to build the darn thing and start slinging to see what we can really learn Cheesy

To that end, it seems that a rough design is beginning to emerge.  Maybe Curious Ardvark or someone else with some mad CAD skills could draw up a prototype small-scale murlin treb for the 3D printer as a starting point???

Back to top
 

“My final hour is at hand. We face an enemy more numerous and cunning than the world has yet seen. Remember your training, and do not fear the hordes of Judas. I, without sin, shall cast the first stone. That will be your sign to attack! But you shall not fight this unholy enemy with stones. No! RAZOR GLANDES!  Aim for the eyes! May the Lord have mercy, for we shall show none!“  -Jesus the Noodler
 
IP Logged
 
NooneOfConsequence
Slinging.org Moderator
*****
Offline



Posts: 2993
Texas
Re: Roboslinger!
Reply #49 - Apr 24th, 2018 at 12:48pm
 
I meant to put this up a while ago... here's an over-simplified structural concept that supports the treb arm only from one side.  Add in a modified murlin pulley and cam system instead of a standard arm, then add a trigger, and it might start to look like a design instead of a cheesy MS Paint sketch, but for now you'll have to use some imagination.

The whole point of this sketch is that we could add a lateral degree of freedom (i.e. elbow) later on if we only support the trebuchet arm from one side.
Back to top
 

“My final hour is at hand. We face an enemy more numerous and cunning than the world has yet seen. Remember your training, and do not fear the hordes of Judas. I, without sin, shall cast the first stone. That will be your sign to attack! But you shall not fight this unholy enemy with stones. No! RAZOR GLANDES!  Aim for the eyes! May the Lord have mercy, for we shall show none!“  -Jesus the Noodler
 
IP Logged
 
Timothy Potter
Senior Member
****
Offline



Posts: 340
Idaho
Gender: male
Re: Roboslinger!
Reply #50 - Apr 25th, 2018 at 3:51pm
 
Very interesting thread; I haven't been on the forum for a while so I've been catching up. One idea that just occurred to me would be to attach a sling to a clay pigeon thrower (trap). It probably would have to be a small sling but it would be an inexpensive way to get a mechanical "arm". I've got one around somewhere, so maybe I'll try it out, but this time of year farm work takes priority over any sling experiments.

-Timothy Potter
Back to top
 

"And whatsoever ye do in word or deed, do all in the name of the Lord Jesus, giving thanks to God and the Father by Him." Colossians 3:17
WWW  
IP Logged
 
NooneOfConsequence
Slinging.org Moderator
*****
Offline



Posts: 2993
Texas
Re: Roboslinger!
Reply #51 - Apr 27th, 2018 at 2:20pm
 
Timothy Potter wrote on Apr 25th, 2018 at 3:51pm:
Very interesting thread; I haven't been on the forum for a while so I've been catching up. One idea that just occurred to me would be to attach a sling to a clay pigeon thrower (trap). It probably would have to be a small sling but it would be an inexpensive way to get a mechanical "arm". I've got one around somewhere, so maybe I'll try it out, but this time of year farm work takes priority over any sling experiments.

-Timothy Potter


If you do, please post a video. I’d love to see it in action. Even if it doesn’t work perfectly, I might need a good excuse to buy a skeet thrower anyway Cheesy
Back to top
 

“My final hour is at hand. We face an enemy more numerous and cunning than the world has yet seen. Remember your training, and do not fear the hordes of Judas. I, without sin, shall cast the first stone. That will be your sign to attack! But you shall not fight this unholy enemy with stones. No! RAZOR GLANDES!  Aim for the eyes! May the Lord have mercy, for we shall show none!“  -Jesus the Noodler
 
IP Logged
 
NooneOfConsequence
Slinging.org Moderator
*****
Offline



Posts: 2993
Texas
Re: Roboslinger!
Reply #52 - Apr 27th, 2018 at 5:58pm
 
Well, it was a little more complicated than I expected to make these animations, but after processing the mocap data through 3 different programs (one of which I had to write myself), here are the results...

I can reprocess the same info from any perspective to produce new animations, and I have data on the speed and acceleration of the sling throughout the throws. Unfortunately we could not put a marker on the ball I was throwing.

The projectile was a 23g plastic wiffle ball, which was too light, but it was all I could throw around all the expensive equipment  Smiley
Back to top
 

“My final hour is at hand. We face an enemy more numerous and cunning than the world has yet seen. Remember your training, and do not fear the hordes of Judas. I, without sin, shall cast the first stone. That will be your sign to attack! But you shall not fight this unholy enemy with stones. No! RAZOR GLANDES!  Aim for the eyes! May the Lord have mercy, for we shall show none!“  -Jesus the Noodler
 
IP Logged
 
Mersa
Interfector Viris Spurii
*****
Offline


Druid

Posts: 2615
Australia
Gender: male
Re: Roboslinger!
Reply #53 - Apr 27th, 2018 at 6:09pm
 
These are cool.
What were the pouch speeds like
Back to top
 

Razor glandes, Aim for the eyes!!!
 
IP Logged
 
NooneOfConsequence
Slinging.org Moderator
*****
Offline



Posts: 2993
Texas
Re: Roboslinger!
Reply #54 - Apr 27th, 2018 at 7:53pm
 
Mersa wrote on Apr 27th, 2018 at 6:09pm:
These are cool.
What were the pouch speeds like


I have only had time to process data from one of the throws so far (out of 12), and I’m not at my computer right now, but I will show some graphs of hand speed vs pouch speed and pouch speed at release, etc. over the next few days as I have time.
Back to top
 

“My final hour is at hand. We face an enemy more numerous and cunning than the world has yet seen. Remember your training, and do not fear the hordes of Judas. I, without sin, shall cast the first stone. That will be your sign to attack! But you shall not fight this unholy enemy with stones. No! RAZOR GLANDES!  Aim for the eyes! May the Lord have mercy, for we shall show none!“  -Jesus the Noodler
 
IP Logged
 
TheJackinati
Senior Member
****
Offline


Slinging Rocks!

Posts: 314
Australia
Gender: male
Re: Roboslinger!
Reply #55 - Apr 27th, 2018 at 8:28pm
 
Awesome!

Back to top
 
 
IP Logged
 
Sarosh
Interfector Viris Spurii
*****
Offline



Posts: 1183
Re: Roboslinger!
Reply #56 - Apr 28th, 2018 at 2:02am
 
wow Cheesy
who needs a roboslinger Tongue
Back to top
 
 
IP Logged
 
Kick
past-moderator
****
Offline



Posts: 4451
Finland
Re: Roboslinger!
Reply #57 - Apr 28th, 2018 at 8:05am
 
That's really cool. Man, I love technology.
Back to top
 

You are a great guy Kick but also slightly scary at times. - Morphy
"Nothing matters, but it’s perhaps more comfortable to keep calm and not interfere with other people." - H.P. Lovecraft, in a letter to Frank Belknap Long, 7 October, 1923
 
IP Logged
 
Morphy
Slinging.org Moderator
*****
Offline


Checkmate

Posts: 8239
Re: Roboslinger!
Reply #58 - Apr 28th, 2018 at 10:04am
 
I agree, that's amazing. Is it possible to be able to see the amount of tension on the cords at any given moment? I'm guessing that's a no, but that would be really interesting to know.
Back to top
 
 
IP Logged
 
JudoP
Funditor
****
Offline


Rocks away!

Posts: 997
UK
Re: Roboslinger!
Reply #59 - Apr 28th, 2018 at 11:53am
 
Morphy wrote on Apr 28th, 2018 at 10:04am:
I agree, that's amazing. Is it possible to be able to see the amount of tension on the cords at any given moment? I'm guessing that's a no, but that would be really interesting to know.


If you could get a read of the acceleration of the projectile throughout the stroke you could probably work it out.
Back to top
 
 
IP Logged
 
Pages: 1 2 3 4 5 
Send Topic Print
(Moderators: Rat Man, woodssj, joe_meadmaker)