Page 2 of 3 FirstFirst 123 LastLast
  1. #11
    thanks , yes i understand how the motors work, but im a newbie in robotics.
    ive made a cnc machine
    if i go with the servos is there any board that is simply to connect and can store the positions?
    my ideaa is to have a box with a joystick or two to control the movement of the motors, and a pot to control the speed of motors.
    thansk

  2. #12
    im just concerned because i think servos are not very robust.
    thats why ive choose the dc motors the thing is that these motors cant find a position, and cannot be controled with a potenciometer for direccion.

  3. #13
    Just a thought if you want to use a small compact computer for the software you could use a Raspberry PI with a wireless dongle.. just a thought

    Fiction is far more plausible when wrapped around a thread of truth

    Nothing great was ever achieved without enthusiasm.
    Ralph Waldo Emerson

  4. #14

  5. #15

  6. #16
    D.C.'s Avatar
    Lives in Birmingham, United Kingdom. Last Activity: 05-01-2016 Has been a member for 4-5 years. Has a total post count of 326. Received thanks 30 times, giving thanks to others 24 times.
    Quote Originally Posted by edgas10 View Post
    if i go with the servos is there any board that is simply to connect and can store the positions?
    my ideaa is to have a box with a joystick or two to control the movement of the motors, and a pot to control the speed of motors.
    thansk
    Quote Originally Posted by edgas10 View Post
    im just concerned because i think servos are not very robust.
    thats why ive choose the dc motors the thing is that these motors cant find a position, and cannot be controled with a potenciometer for direccion.
    I'll say it again as you seem to have missed it, a servo IS A DC MOTOR (usually)(with a gearbox, encoder and electronics). You seem to have a mental block processing that fact. There are many thousands of different types of servo to suit all uses and budgets, if you are looking at for example a 9g mini servo made of plastic with cheap plastic gears you would be correct to say it is probably too weak for you. But if you are looking at a high end robotics dynamixel servo made from titanium it is rather a lot of overkill.

    Until you can say what forces you want your robot arm to deal with you can't really pick the right motors, until you have chosen the motors and figured out what their power requirements are you can't choose a control board/driver/chip because a 3 amp draw on 300mA chip will not work just like it's daft to buy a 70V - 15A board for a servo that wants 1A at 12V.

    If you want something that just works out of the box with all the work done for you, you need to buy a robot arm kit.

    Lynxmotion - AL5D Robotic Arm Combo Kit (BotBoarduino)

    Don't forget you also need a way to save positions, delete positions, name positions, select positions, a way to instruct the robot arm to move to the correct position etc etc. You will need a lot more than just two joysticks to get the functionality that you desire.
    Last edited by D.C.; 12-03-2013 at 03:43 PM.

  7. #17
    ok lets say that i use the mg996 servos, they can handle 11kg so its good enough for me.
    the arm of the robot will have 20 cm in the first and 20 on second section (starting from base)
    the box to control i was thinking on using pots to control it .
    to store the position i can draw a scale around the pots this way i can write them on paper and them when i need it just put the pots in the right place

  8. #18
    D.C.'s Avatar
    Lives in Birmingham, United Kingdom. Last Activity: 05-01-2016 Has been a member for 4-5 years. Has a total post count of 326. Received thanks 30 times, giving thanks to others 24 times.
    Quote Originally Posted by edgas10 View Post
    ok lets say that i use the mg996 servos, they can handle 11kg so its good enough for me.
    the arm of the robot will have 20 cm in the first and 20 on second section (starting from base)
    How do you know that is good enough for you?
    Have you actually worked it out?
    How much does everything weigh?

    The 11kg is 11kg-cm - That means when supplied with 6V it can move an absolute maximum weight of 11kg that is attached to a point 1cm from the centre. You are proposing to stick a microphone, a microphone holder, a load of aluminium, connectors and several servos at a distance of 40cm, I seriously doubt an 11kg-cm servo will handle that load...

    If you examine the previous link I sent you as an example, a different sized servo is used for every joint, because each joint in the chain needs to be stronger than the last to move the additional weight. You can't just throw together a random bunch stuff and hope it all works, that is fine if you are learning how to do things but will just end in failure and disappointment if you are trying to deliver an actual useful product.

    PS I'm getting a bit confused as you keep drip feeding in various bits of information.

    Are you trying to make a 'robot arm' like this:
    Home Made Robot arm picks up coin - YouTube
    Home Made Robot arm picks up coin - YouTube

    Or do you actually want a 'motorised microphone' like these:
    Mic robot prototype - YouTube
    Richard Z. Kruspe on the Rammfire amp emulation - YouTube
    Robot Mic Stand - YouTube

  9. #19
    Personally hardware is the easy thing to workout - the hard part is finding a program that will make everything move at the right speed and stop when you want it to.
    Last edited by Fivetide; 12-03-2013 at 06:04 PM.

    Fiction is far more plausible when wrapped around a thread of truth

    Nothing great was ever achieved without enthusiasm.
    Ralph Waldo Emerson

  10. #20
    There's a very good selection of hobby servos at Radio Control Planes, Helicopters, Cars, Boats, FPV and Quadcopters - Hobbyking* should you decide to use that type of motor.

    Quote Originally Posted by Fivetide View Post
    the hard part is finding a program that will make everything move at the right speed and stop when you want it to.
    That's when you write your own.
    Old router build log here. New router build log here. Lathe build log here.
    Electric motorbike project here.

Page 2 of 3 FirstFirst 123 LastLast

Similar Threads

  1. Robot precision projection mapping
    By Musht in forum General Discussion
    Replies: 2
    Last Post: 10-10-2013, 03:41 PM
  2. FOR SALE: Industrial RObot ARM - the WOW Project for Sure !!!
    By DeWayne in forum Items For Sale
    Replies: 1
    Last Post: 28-04-2012, 08:19 PM
  3. robot arms
    By oadamo in forum General Discussion
    Replies: 7
    Last Post: 15-01-2011, 01:20 PM
  4. 6 Axis Robot Fun
    By Lee Roberts in forum General Discussion
    Replies: 7
    Last Post: 31-07-2009, 12:14 AM
  5. Hexapod Robot CNC router
    By Lee Roberts in forum General Discussion
    Replies: 2
    Last Post: 08-01-2009, 10:54 PM

Bookmarks

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •