rgordon
USA
Asked
— Edited
Anyone interested in creating a team to brain storm ideas and designs for robot arms for large or small robots. Perhaps collectively we could come up with a universal design that many of us could use. We each could provide input, drawings and/or services.
Rex
It seems a great discussion topic! I have some ideas to share, and always with the subtitle "low cost". When you have some spare time publishes some drawings of my ideas, I have a feeling that this issue will be long and educational for all.
Sorry I have been away so long. Been very busy lately. Can't seem to find time for me tired .
I still want to pursue this topic. I would like to get several arm designs done of different sizes and capabilities so members could have drawings to work from or a kit to build. Take some of the design headache out of their builds. Maybe if we work together we could come up with designs for several of the most popular robots so they have stronger more articulated arms and grippers.
There have been a few added. Depending on design here's more:
vehicle arm
mechanical arm
hand
@sfoy-Thanks for the links. Every bit of info helps
More questions for everyone interested:
Some folks will need specially designed arms due to the type of robot toy they are modifying. It would be neat if we had a set of step by step plans for a particular robot toy. Some may just need a good generic type of arm to use on their homemade bot. Some with large bots need very large and strong arms where weight becomes a factor.
If someone has good ideas for homemade claws, hands, elbows, shoulders etc. let's put them out on the table and see what we can do with them. I think this will help spark everyone's imagination. If we get some good designs going we may can get parts laser cut or done with a CNC machine.
I love this theme, which I think if we categorize the different types of arms starting from the number of degrees of freedom (axles or joints) without the degrees of freedom for the clamp or hand, for example: Arm: 4 degrees of freedom (type b) + clip
4 degrees of freedom indicates the axles
(type b) indicates that you can make different combinations with 4 axles and the type b corresponds to a combination of these axes (I'll tackle poersonalmente to publish pictures with all or nearly all combinations of axle shafts from 1 to 6 axes and all its variations: A, B, C, D, E, etc. The more degrees of freedom there are more combinations or types.
And clip indicates the type of key employee could also be hand vacuum, electromagnet, etc.. This is a drawing of an arm of: 4 degrees of freedom (type A) + clip
This way someone can say: I am building a 3-axis arm (type a) + clip, look in the catalog of arms and you know which are the axes or degrees of freedom and where they are, you'll know if the doll has rotation or is fixed, or if the shoulder in front and back ranges, etc. .. If it seems a good idea to begin to make the catalog with pictures, plus every new idea or design not listed arm will include it in the catalog with a new letter.:)
I think this is something that everyone will have to work out. I personally want a humanoid style hand and arm. It doesn't have to lift massive amounts of weight but it needs to be functioning. I want it to be able to pick something up, like a ball for example but gentle enough where it could pick up a flower. I also want it to look somewhat decent.
Our goals are still function arms that are reasonably priced/to build?
I think mainly we're gonna have to gather tons of ideas, then as someone is going to build it. They should document and post. If there's a specific toy then great but I think we'll mainly end up with a collection of arm styles and each of us will have to figure out how to implement into our project.
I wish I had the time/money to just build all of them to see which ones work best.
A humanoid type arm is just what I want to pair my robot RSP, or rather two arms, and also I have the same goal as you sfoy that can lift light, a light object held by the robot hand is a burden large shoulder on the shaft due to the lever, so it is a challenge to an arm to handle heavy loads, especially if our goal is low cost. The idea of the catalog is only a part, as you say mate rgordon other aspects such as materials, if used servos or motors or a combination of both, etc. .. I think this applies to anyone who wants to build an arm from scratch, find a toy robot arm to change it is cheaper but I have not seen any humanoid. Personally I prefer to think that the arm is going to do, then how to get that with cheap materials and that I can work them and especially the choice of servos or motors apply to each axis servo arm because there is not strong enough, other just having the force but soon broken by overloading and proper that can last a long time and are usually more expensive. If your target is a humanoid robot arm with hand me know if you want to have full mobility similar to a human, or just need the humanoid with several degrees of freedom: shoulder, elbow and wrist. If you want to lift an empty glass or want to play with a glass liquid to another without spilling a lot of wine in the attempt, in which case you need more axles rotation of the hand or forearm. I have some ideas for a simple humanoid arm, using a 6-turn servo shoulder (delicate point effort) coupled to a much bigger gear, so the 6 laps you turn the servo = 2160 degrees become half rev = 180 degrees and also multiply the force of the servo. I think I've spent a little writing I hope will pardon my excess free time today, hehe.
More links for study
ROBOT STATICS
ROBOT ARM TUTORIAL