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
work out my design to lift over 50 lbs ,more like the bionic arm in 6 million dollar man movie
project is called 6 million dollar omnibot
lot of times i make my own servo's its pretty easy all you need is the futaba s3003 servo and remove the board and pot and motor ,and add your own motor and gear box and add the pot for feedback,now on the h-bridge on s3003 board it rated at 1 amp,so 2 in parallel gives you 2 amps or remove it and add your own h-bridge
for gear box kinda easy to work it out,just need specs on motor you are using,speed and torque and torgue you want out ,then gear ratio is kinda easy
if like example you need a 4 to 1 ratio, and want to use the smallest pinion gear for the motor like 9 teeth output gear would be 36 teeth,reason for a small pinion gear is that the output gear is small to fit inside your design or get a little harder like in servo are made with a few gear ratio's, now with a 4-1 ratio speed will be 4 times less and torque 4 times more
plastic hands makes a great template
Watching you guys develop your robots gives me and others lots of inspiration. Your designs are outstanding!
@R2D2
Those look like a great find on servos. Very good looking arm.
@robotmaker
Do the gear motors behave and control/maintain position as well as as servo does when you set it up this way? Would love to see videos and pictures.
@bret
That robot is coming along nicely. Can't wait to see him in action. More videos
feedback is very important the pot must be on the last gear
the best servo board easy to modify and there is a schematic on it is FUTUBA S3003 plus very cheap from CHINA on ebay about $4 each or less
I thinkl it could be made of servo driven steel ropes too.
Marc
Yeah I have seen that one and I really like it. I have thought about trying something like this using miniature linear actuators and the steel cables used on lawn mowers (the ones that position the choke or throttle).
Now I have seen your avatar....your maximillian always have added a pair of festo arms....I've not seen this before.
I think four steel cables for the Arm, driven bei two servos should make up/down/left/right, but I think you need the same again for the wrist and one servo for the Hand.
So we need at least five Servos for one arm, but it seems to be an interesting experiment.
EDIT: I read the complete thread now, I think strong RC-Servos are really expensive.
In my opinion the better way is to use a servo elektronik and a strong motor with (planet)gearbox and pot.
I looked for "servoelektronik" on google and found a two channel servo elektronik that can handle motors with 10A.
You can get the electronic for 6V, 12V or 24V, but it seems that is fixed and have to be ordered with the needed voltage.
It's a german site, but I think there would be others in the web:
5. Servocontroller
Here is another electronic, called "Thor15 Servo" that can handle up to 12V/18A.
Thor15 Servo
Here's a diy schematic for a one channel servo electronic for 24V/15A with MosFet's:
ServoController 24V/15A
Marc
--Thomas
I am sure looking forward to the changes. Thank you Tony - EZ1 robot maker and D J Sures, EZ robot creator.
Steve S
recycled bike cable go back to the forarm servo platform
rivots can be used for more then just rivoting metal together
the right arm layout with 4 degrees of movement...servos not installed yet. All servos are "gear" assisted for esthetics and torque..the wooden hand took about 2 days to complete. Its nice to have the "hand model" in sight
irobot wow that arm is pretty impressive.