Shlomo
Canada
Asked
— Edited
is there any way to connect with someone experienced with building and remotely controlling a large robot for collaboration on a commercial project?
Related Hardware JD Humanoid
@Dave Schulpius, I like your posts they are always positive.
There is a difference between providing examples and experience and criticizing someone.
Only to clarify I'm firmly believer you should follow your dreams and ideas, I've been following my dream: Creating, integrating, solving software problems for more than 15 years and when someones says it can't be done... I'll try my best with the available time to help and find a solution.
**** EDITED **** The previous post content reflected my thoughts. I erased the negative part to focus only on the positive side.
Thank you all for encouragement. I'll be taking this up soon with Alan re: Partners@synthiam as Alan suggested. I would also like to contact those with established projects to see if we could work together but can't find anyone current via cruising this website.
Meanwhile, a question bubbled up. If I made a life-sized robot using Synthiam's servos, would the arms be capable of lifting 10 lbs? Or, what is the maximum weight that servo can lift? (I am probably asking the wrong way because I am not conversant with the technical terms).
I'll break your question
The technical term is Torque https://en.wikipedia.org/wiki/Torque the standard unit is Newtons Meters but you can use Kg/cm, In/lbs etc. To compare torques you will need to have the same unit e.g. N/M, kg/cm, etc. Online converter tool: http://www.onlineconversion.com/torque.htm Very subjective, let's imagine your robot arm length is 80 cm and has one servo only in the arm extremity. If you add more joints/servos this servo will handle all the weight. EZ-Robot/Synthiam HDD servos torque are 19 Kg / cm source: https://www.ez-robot.com/Shop/AccessoriesDetails.aspx?prevCat=104&productNumber=1307 There are other factors like the arm weight, joints placement/rotations, but to keep the exercise simple the Torque formula:
source: https://www.grc.nasa.gov/www/k-12/airplane/torque.htmlTorque = Force * Length * cos(Angle) => Force = Torque / (Length * cos(Angle) )
What we know: Torque = 19 Kg /cm (EZ-Robot Servo) Length = 80 cm Case 1: Arm resting, Angle 0 deg. F = 19 / (80 * cos(0)) => F = 19 / (80 * 1) => F = 0.23 Kg In theory the arm can hold 230 grams
Case 2: Arm at 90 deg = 0.785 radians F = 19 / (80 * cos(0.785)) => F = 19 / (80 * 0.70 ) => F = 0.335 Kg In theory the arm can hold 335 grams
Bear in mind there are other factors, but this will help you start.
ROBOT ARM CALCULATOR: https://www.societyofrobots.com/robot_arm_calculator.shtml
Thx so much PTP. This is very kind of you to take so much time. So what kind of motor so I need to lift/support 10 lbs or 5 kg
I don't have a mechanical engineering background, there are other design factors like gearboxes, transmissions, joint placement.
for benchmark purposes a collaborative arm 80 cm 5 Kg payload (URM5) https://www.universal-robots.com/products/ur5-robot/ costs 35 K then you will need to add some addons, services, support etc.
maybe some other members can chime in and contribute their "bits"...
bear in mind we are DIY members, for a professional opinion take Synthiam/Alan's suggestion.
PTP, thx for reminding me. I convened a group from my community when the idea 1st hit me to make sure it was feasible - among that group was a young fellow in his last semester of mechanical engineering - haven't seen him in awhile because he was busy with exams, but now he will be a good source for a suggested solution I will also follow up with Alan, as you correctly suggest
Still looking for someone to help build the life sized robot -
Just want to say, thanks, great links
Awesome...this thread went off the roof since I checked it the last time!! Great to see the engagement...and the NASA Research Chart is supercool!!!
Why dont you start to develop the system on a smaller scale, to develop the software and scale the mechanical parts later?
Just an idea...great to have you on the forum!!