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81
Mechanics and Construction / Re: Actuators too small to simulate human arm?
« Last post by midhun131 on July 30, 2017, 12:52:11 PM »
Pneumatic ram is a good option but then the speeds would be not as per the requirement. Check out either linear actuator/servo. Another method you could consider is a motor and cam assembly.
82
Software / Re: hello which software are used in robots??
« Last post by braingame26 on July 30, 2017, 11:02:57 AM »
I've written programs in C and VHDL for circuit board you can use to control robots. You can find Arduino tutorials on Google and Youtube that show you how to program a robot using an Arduino.
83
Mechanics and Construction / Virtual reality motorized shoes
« Last post by braingame26 on July 30, 2017, 10:45:24 AM »
I've been looking into the various virtual reality treadmills that are out there today, such as the Virtuix Omni, Infinadeck, and Kat Walk. None of them are available to consumers. I've been trying to think of a way to make my own inexpensive virtual reality treadmill. I don't really like how with the Virtuix and Kat walk you have to slide your feet, so I was thinking about doing it with motors.

There is this video where the guy is wearing motorized shoes that negate him walking forward. I'm thinking of trying something like that, but making a few modifications like adding a frame that goes around you with a safety harness you wear so you don't fall over, use an arduino and accelerometers on the feet to control the speed.


I'm a software developer so I can handle the programming side, but I don't have a lot of experience with motors. I looked into the motors that are used in electric skateboards (dc brushless, low kv). Instead of buying big lipo batteries, is there any problem with just hooking the motor (through the ESC) to a dc power supply?

To calculate the motor size I assumed a 77 kg person (around my weight, 170 lbs), an acceleration of 1.34 m/s^2 (3 mph), to get a force of 77 * 1.34 = 103.18 Newtons. For a 2" wheel (0.0254 meter radius), the torque would be 103.18 * 0.0254 = 2.62 Nm. If the max velocity is 6 mph (2.68 m/s), then the rps is 2.68 / (2 * pi * 0.0254) = 16.8. Finally, wattage would be 2.62 * 16.8 * 2 * pi = 276.5 watts. So I need a 275 watt motor. Please let me know if my calculations are wrong.

I also tried to find diy tutorials or commercial motorized shoes so I could see what motors they used. I found X-Shoes and Rocket Skates. X-Shoes claims to use just 2 60W motors, but is able to go 15 km/h. Rocket Skates claims to use 4 55W motors (one in each wheel) and can go 12 mph. These motors seem too small to me to achieve those speeds, but maybe their using a combination of gearing and batteries with a high discharge (so they wouldn't last a while, but they'll go fast), or they're just lying :).

Thanks for any advice!
84
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Videos of Sanbot:https://www.youtube.com/channel/UC5CON9DWkJYoyNduNTRLfXg
Our website: www.en.sanbot.com


And feel free to contact with me, my contact information is on the below.
Email: [email protected]
Skype: qihan7
whatsapp: +86 18818571855

85
Misc / How do you find a good robot engineer/design?
« Last post by 20GT on July 26, 2017, 06:07:54 PM »

How does the average Joe that knows nothing about robots get a decent designed robot?

I'm talking about a guy like myself, sure I could put years into learning all about robots, but that's not what I'm looking for.

So where do I start? Yes I could go to Google and pick a company but that limits the creativeness to that particular team.

I thought I would go to a robot forum like this and get knowledge and experience from all the users. But I don't want to mooch I want people to feel like the design that I walk away with was paid for.

How do I go about getting input from the robot designers here? How has it been done in the past?

Do I list my project and get bids?

Are contests acceptable? What is a reasonable prize amount for a design contest?

All I want is a good designed robot, how do I start?
86
Robot Videos / One of my proud creations. The super cheap humanoid
« Last post by dwrobotics on July 22, 2017, 07:38:31 PM »
So I wrote a little intro in the misc section. I'm a maker of robots and I'm trying to make a full size humanoid robot that will be cheaper than any before. I think I can make one for under ?1000 ( $2000).

   Here are some vid of my work :
   


In case you are interested I've done a couple of write ups for this project on the following sites:
hackerday.io

robotrebels.org

letsmakerobots   ( now accessed from robotshop)

Let me know what you think.
87
Misc / Introducing myself
« Last post by dwrobotics on July 22, 2017, 07:30:13 PM »
Hi SOR,

   Interesting to find another PHP forum about robots so I thought I would sign up and say hello. As an intro I am sometimes known as danphobic_ but I am now using dwrobotics as I have aspirations to start making robots professionally.
    Do any of you know robotrebels.org? It's a fairly active forum made up largely of members who were refugees from another large site. They are a cool bunch and will offer guidance and expertise on all matters robot. I'm thinking if this site and that site merged it would make a much more active community. Just a thought.

 Anyway I am going to start a thread in the videos section to link two of my videos of my ambitious human scale humanoid robot that I am currently building. Hope you enjoy.
88
Mechanics and Construction / robot pressure washer?
« Last post by 20GT on July 22, 2017, 10:22:17 AM »
I?m just a janitor working at a dead end job. They had me pressure wash some concrete the other day and was thinking basically the only work involved is moving the tip.

I have no experience with robots, but I have an idea and that?s a start.
I?m looking for a robotic pressure washer for driveways and sidewalks. There are robots out there.


http://www.combijet.com/en/view-product-detail/5/0/59/rje-1000-hydro-blasting-robot


http://swinerobotics.com/site/wash-hand/

But they are not exactly what I?m looking for.
This last one is closer to what I want but only because its cleaning concrete lol


https://www.youtube.com/watch?v=mAL_RDsAwLw

What i would like is unit that moves back and forth and forward like a printer steadily covering the area.
I'm supposing GPS and a photogrammetry map from a UAV could be used to plot the path of the unit.

Challenges
  • consistency of the clean
  • vibrations from the gas powered engine on the pressure washer itself affecting the sensors


What different ways and sensors could be used to keep the clean constant?
visual sensor - what if the concrete isn't that dirty and the clean swath is not contrasted enough?

Maybe something to measure the size of the cleaning swath and calibrate accordingly before starting the job. 
But that is only to help with the map and does not deal with the consistency. 



Because of the vibrations from the gas powered engine on the pressure washer itself I'm thinking two units would be required.
one for the pressure head and one following behind with the pressure washer. (I'm not sure if an electric pressure washer would be powerful enough and then you also have to supply power.)

Any ideas or suggestions would be great.


89
Software / Error: A position sensor is not mastered or referenced
« Last post by Kukaiiwa on July 20, 2017, 09:33:45 AM »
How can master my LBR iiwa's position sensor(A1), if the Axis already out of its work-space ?

notes:

- Axis-1 out of its Work-Range(on smartPAD: -190)
-I try to get it in its work-range with KRF mode, but axis A1 moves just till -190, not any more (not in Work-Range)

thanks
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90
Software / Tips for Testing KUKA Callibration
« Last post by thinktankgroup on July 13, 2017, 03:37:46 PM »
Hey there! Our new KUKA robot is currently being installed and configured as we speak. Before the team of engineers that are setting it up leave, I would love some feedback and any suggestions on how we can ensure it is being setup, configured, and calibrated properly. We want to make sure that everything is being calibrated perfectly, before the engineers wrap up installation :smile:

I'm hoping someone might have some suggestions, sample files and tests we could run to be able to quickly confirm everything is setup and dialed in perfectly. Any tips on what kind of things to be on the lookout for? Known issues, common problems, etc... Here are some of the questions we have:
- What are the best ways to ensure the 7 axis robot, liner rail, rotary table, and parts change is setup properly?
- Are there any test files that we can use to help us easily test and validate the calibration?
- Are there any other software or tools we should be using?
- What things should we be looking out for in order to ensure the calibration is setup perfectly? (Repeatability, Accuracy, etc...)
- What would be some great projects to test each of the areas?
- What else are we not thinking of?

Robot Cell:
- KUKA KR-150 r3100 on a
- Tools: Mill, Hot Wire, (Extruder, Chainsaw, Plasma Cutter, Coming Soon)
- Wireless Touch Sensor
- Robot sits on a 40ft Linear Rail
- 48" Rotary Table
- ATI Quick Connect Head and Plates
- 10 Part Tool Garage Changer
- Laser Part Setter
- Laser Fence

Software:
- ZBrushGrasshopper
- PowerMill
- Grasshopper
- ArtCam

Thanks again!
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