Robotic arm throwing a ball for a game of pétanqueBlind

in CAD Design held by swoday07
TIME REMAINING: 2 days, 8 hours
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Description:
Hi,
I'm an educational content creator, and I'm currently authoring a course on mechanical engineering / control / robotics. For the course example, I'd like to build a simple robot on a rail with a few degrees of freedom that throws a ball. I'm not so well versed with Onshape, so would need help to make it look better, especially the gripping mechanism, the rail, and the other parts.

The robot is supposed to replicate a player in a game of pétanque:
www.youtube.com/watch

cad.onshape.com/documents/e6373cddd9e11ef3ed3c63e1/w/c5c2be2a5a79af89f98ffb69/e/dbf77a433ed8a91b737b253a
Wants:
You're free to modify the shapes as you see fit, but the overall dimensions need to remain the same (eg: length of the rail must be 4m). The gripper mechanism needs to be improved but it needs to be able to grip a ball of the same radius as what I supplied.
Don't Wants:
The design cannot have too many complex parts, as it will be imported into Simscape Multibody.
Software:
  1. Onshape

Entries

= Buyer's Rating
#15 Robotic Arm Model by rockyksr
Sep 23, 2022 10:08
#14 Robot Arm throwing ball by taposray_rt
Sep 23, 2022 7:05
#13 Robotic Arm with 5 Degree of freedeom by Mandar Salunkhe
Sep 22, 2022 18:45
#11 Robotic arm by banuk
Hidden design
Sep 21, 2022 15:15
#9 Robotic arm throwing a ball3 by Johnney_7
Sep 20, 2022 7:51
#8 Robotic arm by banuk
Sep 19, 2022 17:44
#7 game robotic arm by jammy27
Sep 19, 2022 16:06
#5 Robotic arm by banuk
Sep 18, 2022 17:53
#4 Robotic arm throwing a ball1 by Johnney_7
Sep 17, 2022 4:52
#3 Robot Arm Pitcher R1 by Routhians
Hidden design
Sep 16, 2022 18:25
#2 Robotic arm by banuk
Sep 16, 2022 17:19
#1 Robot Arm Pitcher by Routhians
Hidden design
Sep 15, 2022 19:32

Discussion

swoday07

Buyer

Sun, 18 Sep 2022 20:43:50 +0000
Hi @Yugendhiran, it doesn't necessarily need to be the same dimensions, as long as it's able to grab the ball adequately.

swoday07

Buyer

Sun, 18 Sep 2022 20:43:16 +0000
Hi Chinmayk, yes, as long as they're importable in Onshape. Parasolid / STEP files are preferred.
Sun, 18 Sep 2022 09:10:47 +0000
Hi @swoday07, and also you need the other dimensions for example thickness of arm in the given design is 12cm, so you need the design like nearly to be 12cm
Sun, 18 Sep 2022 05:25:53 +0000
Hello swoday07, can we make your model on different software.

swoday07

Buyer

Thu, 15 Sep 2022 19:25:29 +0000
Hi Yugendhiran, no, no need to show the internals :)
Thu, 15 Sep 2022 17:15:08 +0000
Do you need the internal drives and mechanisms to be shown like motors and stuffs?

swoday07

Buyer

Thu, 15 Sep 2022 07:35:10 +0000
Good morning, yes:
1) the ball radius will be max 72 mm (a ball of petanque is actually roughly between 70.5-80 mm in *diameter* according to Google, but it was a bit too small so I increased it by a factor of 2 in Onshape, see the variable "scaling" in the Variable Studio panel on the right)
2) the other dimensions should roughly be the same, the only constraint is the overall length of the rail, as it needs to fit within the court width (4 m), you can make the rail thinner or thicker, that is not a problem.
3) the idea of this project is to show how CAD can increase the visual fidelity of the robot arm without affecting its main purpose.

And finally, just to confirm the deliverable:
- Robotic arm assembly (rail, robot arm with assembled joints) as CAD files (eg: link to Onshape assembly, or if using Solidworks: STEP, SLDPRT) - ideally should be created in Onshape as the students are familiar with the tool, but Solidworks works too, as long as it's importable into Onshape without too many issues.

abhi007

Designer

Thu, 15 Sep 2022 05:22:26 +0000
Hi @swoday07, can we go with the onshape cad model dimensions which you have attached. For example, the ball radius is 72 mm. Are these dimensions exact to refer for the final model.
Thu, 15 Sep 2022 04:13:06 +0000
you want the design or complete equipment along with the design ? Can be done

swoday07

Buyer

Wed, 14 Sep 2022 21:03:10 +0000
Hi, the idea is that students will first build the robot as it is on the screenshot (Picture 1) using fundamental shapes (bricks, spheres, cylinders, extrusions, revolutions), then once they get the mechanism working right (joints/mates), they'll implement simple control laws to make it throw a ball. Once it's working, we can substitute it with the more aesthetically pleasing CAD version that provides the same functionality.
Wed, 14 Sep 2022 20:52:28 +0000
hello
i can make it for you,
you want a model that looks like a robot arm and has a hand like gripper in front how many free moving axes do you want ?
should it be more parametric that you could build it or rather nice to look at?
Wed, 14 Sep 2022 20:49:09 +0000
Excellent thank you!

swoday07

Buyer

Wed, 14 Sep 2022 20:45:32 +0000
No, it will be used just in robotic simulations. I just need to make it look a bit more sophisticated / more realistic, as currently it was created using simple extrusions and revolutions. The number of degrees of freedom and their locations should remain the same, and the gripper, if possible, should be able to open and close. The goal is just for it to be able to throw a ball: https://ibb.co/VHZLW8V
Wed, 14 Sep 2022 20:43:42 +0000
Another question, are you actually going to build this robot?
If so I will submit a design using hardware (nuts, bolts, bearings, etc) from a local vendors’ parts that you prefer to work with. Otherwise I will design it using McMaster Carr hardware.
Wed, 14 Sep 2022 20:36:19 +0000
Perfect, I’ll start working on this then. I will submit as parasolid and if there are any issues importing that into onshape we can figure something out from there.

swoday07

Buyer

Wed, 14 Sep 2022 19:58:38 +0000
Hi SolidworksNinja,
As long as I'm able to reimport the entire assembly in Onshape for the students, and as long as the different CAD parts do not deviate too much in terms of functionality from the example provided in Onshape, I think it would be alright. Otherwise, I'll just request a license for Solidworks from my company and we can move on from there.
Wed, 14 Sep 2022 19:51:42 +0000
Another Solidworks user here, you mentioned you wanted to use onshape but for some reason aren’t able to accept work done in Solidworks? (As per answer below)
I can do the design in Solidworks and export into any file type you want. Parasolid (.x_t) files usually work well in onshape.
Typically these contests come with a list of file types that are acceptable. Parasolid, Iges, dxf, dwg, ai, psd, step(stp), ply, 3dm, stl, are all types that I can export to pretty easily.
Do any of those work for you?

swoday07

Buyer

Wed, 14 Sep 2022 19:09:03 +0000
Hi Foued, unfortunately we're using Onshape for the training, so cannot use Solidworks
Wed, 14 Sep 2022 19:06:37 +0000
I can design it with Solidworks

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