Tuesday, December 22, 2015
Saturday, December 12, 2015
How to make a Robot which can walk on irregular surface
Two more pin joints and links are added to the ends of the backbone, (Fig. 4). The new links are now constrained to move along a straight line or a fixed path which approximates the rope to be climbed (Frame). At any given instant, link 4 is fixed while link 5 slides along the fixed path or vice versa. The whole mechanism now is a four bar linkage, powered at the center. Links 4 and 5 are important as they act as sliders, whereas links 2 and 3 act as cranks. Links 4 and 5 also provide the base on which the entire gripping mechanism is to be mounted. Even if the backbone, without links 4 and 5, is complete, they are added to the backbone for reasons detailed above. Link 5 Link 1 Link 2 Link 3 Link 4 Fig. 4 Four bar mechanism (backbone) 2.2 Design of Grippers The design of the gripper is an essential part of the rope climbing robot. During the vertical climb, the gripper has to bear the entire weight of the robot and the payload. This, is the main consideration for the design of the gripper. The gripping mechanism can be approximated by another four-bar mechanism. This mechanism is to be attached to links 4 and 5 of the backbone. Link 3 Link 4 Link 2 Link 1 Fig. 5 Gripping mechanism The four links, shown in fig. 5, are joined together by pin joints. The mechanism can be powered by means of two pulleys. A motor is attached to the smaller pulley and through a transmission belt the rotation is conveyed to a bigger pulley. The larger pulley is attached to the four bar mechanism, when it rotates, it causes link 3 to clamp or unclamp the rope held
How to make a rope climbing robot
1. Introduction A study of the sloth bear (Fig 1) in motion reveals that the bear uses both pairs of its limbs (fore limbs and hind limbs) to climb a rope or a tree. It moves both its hind limbs in one step and then both its fore limbs in another. Each pair of limbs acts as a gripper. Only one pair of limbs is used at a time for gripping the tree (while in motion) while the other pair slides over the tree. The bear uses its back as a hinge, the back being straight in one instant and bent in the other. This movement when coordinated can be a very efficient and a reliable mechanism for climbing. No wonder then, the sloth is one of the best climbers in nature. This is also the reason why it was chosen as a model for our study. In recent years, several researchers and groups have reported work on such biomimetic devices. For example, “The Robo-tuna” (Barrett [1]) is an ongoing project at MIT’s department of ocean engineering, where attempts are being made to copy the motion of a blue-fin tuna in order to develop a better propulsion system for autonomous underwater vehicles. Ayers et al [2] reported attempts being made at the Marine Science Center, Northeastern University, to copy the behavior of lobsters for the purpose of conducting autonomous investigation of both the bottom and water column of the littoral zone of an ocean. Analysis and development of snake-like devices has been reported by Hirose [3]. The ROBO-Sloth is comparatively simpler as far as its behavior is concerned. It has only to move along a pre-defined path. An improvement in design would be to enable the robot to shift between ropes, whereby the problem would become that of motion in space rather tha
How to make a self jumping Robot Toy
Magic tricks can't hold a candle to this scientific triumph! Watch your child's astonishment as he sees that he can make a candle burn below water, and create a very bizarre candle souvenir. With just the open flame above the water's surface, this process will transform the candle to a hollow tube of wax. The water surrounding the candle is the secret to this "trick"! It keeps the exterior of the candle at a cool temperature, so the area touching the water never melts!
What You Need:
- Taper candle
- Large bowl
- Duct tape
- Cigarette lighter or candle
- Cold water
- Scissors
What You Do:
- Have your child cut off four 4” lengths of duct tape.
- Invite him to fasten the candle to the bottom of the bowl with duct tape.
- Help him fill the bowl with water just to the top of the candle. Be careful not to submerge the wick!
- Light the candle for your child. Instruct him to be careful of the open flame!
- Encourage your child to observe what happens. The candle should burn all the way to the bottom of the bowl, leaving a thin tube of wax.
What Happened?
If you had lit and burned the candle in a waterless bowl, it would have burned normally and eventually consumed the whole candle. This is caused by the action of both heat flow and a high temperature. Get your child thinking: Why did the candle burn differently when he added water to the bowl? It only seems like magic that the candle burned while it was underwater!Water has the amazing quality of absorbing heat energy, and because you used cold water, even more heat energy was absorbed. Once the candle's heat energy dissipated into the water, the heat had much less impact on the outer surface of the candle, resulting in the candle's strange transformation.
Electric Outboard Motor - RMCybernetics
- Creative Ideas | Elkins DIY » Micro Boats » Electric Boat (Plans now available) Electric Boat... The boat, not including battery and motor,weighs in at 65 pounds.
- How to make an electric outboard motor for a rowing boat. This was made using a wheelchairmotor, angle grinder gearbox and steel box section for the frame.
- anyone ever build their own electric outboard / trolling motor from scratch? i cant find any info anywhere ???..... so i turn to the best thanks
- Dan from Nova Scotia wins this year's Ed's Boat Tips Boater Innovation Award for his electricoutboard engine conversion.
- The Backwater DIY Electric Boat Marathon Who said water and electricity don't mix? At the Wye Island Marathon, the combination is celebrated as racers push ...
- I came across this homemade electric outboard project that looks easy and cheap to build. Might be good for experimenting with different size props and pitches…
How to make an Electric Boat
How to make an electric motor boat with the home materials?
i have a project and i do not know how to
make it ...i am weak in these elctric circuits n
ol ...can any1 plz help me..itz urgent
!.Probably has more to do with liability and
market size than engineering. Though this
open source design shows just how simple
electric propulsion really is. Not sure how
durable it would be but, looks like a good
platform to experiment on or to help get you
from the dock to the mooring and the parts are
cheap enough and since you build it yourself
from common components it would be easy
to repair.
Capt. Mike
how to make simple radar
i see many project on net about ultrasonic radar system ....finally i made this here i share this project with you which is easy to make with ultrasonic sensor arduino and servo motor ....follow the step ...
part to be required
1.arduino microcontroller uno
2. servo motor
3. ultrasonic sensor
4.basic stucture to mount
5. jumper wires
6.arduino ide
7.processing 2.1 ide
download arduino ide
download processing org.
Step 1: Make a bread board circuit and rigid structure to mount arduino board ..
Arduino and processing program
first upload the arduino program to arduino board
open processing ide ....
copy past the program i give here for processing .....and press play button ...
if everything is ok then you will see the radar screen as shown in above figure.....
How to make a Car - Powered Car - Very Simple
MIT students have created a huge library of
free STEM videos to bring “excitement and
understanding of science, technology,
engineering, and math to kids.” Very nice
collection! Subjects: biology, earth science,
electronics, materials, measurement,
physics,
things that fly, and MIT + Khan Academy
Underwater Candle - Science Experiment
Magic tricks can't hold a candle to this scientific triumph! Watch your child's astonishment as he sees that he can make a candle burn below water, and create a very bizarre candle souvenir. With just the open flame above the water's surface, this process will transform the candle to a hollow tube of wax. The water surrounding the candle is the secret to this "trick"! It keeps the exterior of the candle at a cool temperature, so the area touching the water never melts!
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