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Leroy Good

NXT Hand Generator Car - 5 views

www.nxtprograms.com/...steps.html

shared by Leroy Good on 07 Dec 11 - No Cached
  • Hand Generator Car
  • Building Instructions
  • Make sure that the gray bushings on the outside of free-spinning axle are not pushed on too tightly, so that the axle can spin easily.
  • ...8 more annotations...
  • Use one of the longest wires to connect the two motors together
  • If you put gears on the crank, make sure you build it very strong (brace the gears on both sides), otherwise the gears will slip and grind, or you may break a peg or bend an axle.No matter what, crank smoothly and be gentle with your crank motor, you don't want to damage it!
  • Hold the crank motor firmly in one hand and crank smoothly with the other hand.  Important: Be smooth and gentle so that you don't stress the motor parts.  Notice that if you crank the other direction, the car will change direction too.  If you are left-handed, or if you want your car to go the other direction, you can switch the hand crank to the other side of the motor.   
  • Try using gears on the car (or possibly on the hand crank) to change the rotation speeds and see how this affects the speed of the car.  Here is an example of using gears to speed up the car, if you can figure out how to build it or make something similar.  
  • Using the Generator Car
  • Try some other designs for the car.  There are lots of possibilities. Does this generator trick give you any other ideas that you could use it for?  For example, if you had an NXT robot that used one motor powered by the NXT for something, you could power and control the speed and direction of something else by using a second motor powered by a generator from the third motor.
  • If you carefully note now much the car wheels turn for each rotation of the crank, you will notice that one full turn of the crank results in somewhat less than one full turn of wheel rotation.  This is because the electric generator is not 100% efficient.  There are some losses due to friction and other things.  For example, if the car wheels turned 270 degrees for each 360 degrees of rotation of the hand crank, then the generator would be 270/360 = 0.75 = 75% efficient.  Can you estimate the efficiency of your generator?
    • Leroy Good
      Leroy Good on 07 Dec 11
       
      DONT USE THIS CRANK LEVER it would be outside intervention
  • Leroy Good on 07 Dec 11
     
    How to make a car JUST DONT USE THE CRANK PART AND MODIFY IT other then that This will help you desighn the car!!!
Dustin Scott

Gear and Wheels Part 1 - YouTube - 11 views

www.youtube.com/watch

gear ratios wheels

shared by Dustin Scott on 07 Dec 11 - No Cached
  • Alexander Sarkis on 07 Dec 11
     
    this is useful in helping choose what kind of gear ratio you want to use
Richard Sgalia

HowStuffWorks "Torque, Traction, and Wheel Slip" - 6 views

auto.howstuffworks.com/four-wheel-drive1.htm

shared by Richard Sgalia on 06 Dec 11 - No Cached
  • The coefficient of friction is mostly a function of the kind of tires on the vehicle and the type of surface the vehicle is driving on.
  • Richard Sgalia on 06 Dec 11
     
    Helps explain the friction betweena tire and the surface it is on
Oscar Rivera

Robot SUMO--using LEGO NXT - Seyretmelik.com - 6 views

seyretmelik.com/...48221754

shared by Oscar Rivera on 17 May 12 - No Cached
  • Oscar Rivera on 17 May 12
     
    THERES NOT MUCH TO SEE BUT I LIKE THE IDEA OF THE HAMMER, IN THIS VIDEO. AND THEY ACTUALLY USE ONLY PIECES THAT COME FROM THE NXT TOOLKIT, AND NOT FROM OUTSIDE.
  • ...2 more comments...
  • Timothy McNamara on 17 May 12
     
    very good find oscar
  • Nicole Mich on 17 May 12
     
    IM PROUD OF YOU OSCAR! WHAT AN AWESOME FIND!
  • Colin Fair on 17 May 12
     
    good idea, using the extra wheels that come witht the kit to build a hammer
  • Richard Sgalia on 17 May 12
     
    Nice job Oscar the video is solid
Alexander Sarkis

NXT Modular Test Vehicle (MTV) - 3 views

www.nxtprograms.com/...steps.html

shared by Alexander Sarkis on 06 Dec 11 - Cached
  • The Drive Wheels module is designed to make it easy to change the gears used so that you can experiment with different gear combinations.  Different combinations will result in different gear ratios, which will have a big effect on the speed and power of your robot.   The faster gear combinations will make the robot go faster but have less power, which will make it harder to turn and carry loads, and note that faster robots are also typically less accurate. 
  • Alexander Sarkis on 06 Dec 11
     
    tells u what each gear does
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