Arm Definition and 201 Threads

Hi! For my finally year design project, I intend to try and solve the problems with existing shower bathing aids for the elderly and disabled. I won't go into details of what problems and how, etc, but I will give you an overview of the mechanism I intend to use. My product is essentially...

Here is the problem http://imgur.com/6KRKJQu Torque = force x lever arm We are told that the force is all the same so the only thing that would determine the torque is the size of the lever arm. The ones that I'm not sure about are B and C. The rest I think I have done correctly. Just to make...

Background: I'm a high school robotics team member. These first two images show the general design of the robot; the design is intended to use two arms, with "hooks" on the end (more like a bearing on a shaft, really), represented by cylinders, to hook onto a steel bar, and pull itself...

Homework Statement Assume that a 1.20-kg ball is thrown solely by the action of the forearm, which rotates about the elbow joint under the action of the triceps muscle, the figure. The ball is accelerated uniformly from rest to 9.5m/s in 0.38s , at which point it is released. Assume that the...

Homework Statement Hey guys. I am just learning machine code for Cortex-M. There are a few exercises within the textbook, however, I am not entirely sure if I am doing them correctly. If you could possible look over my work to see if there are any mistakes, I would greatly appreciate it! They...

As shown in the picture, a vacuum created in the tank sucks in sludge from the gutters. The hose used for doing so is held in place by a structure called the boom arm. What magnitude force will act on the boom arm when the sludge is being sucked in? What I mean is, how do I estimate the force...

Homework Statement Find angular acceleration in deg/sec^2 given the following factors: - Total mass: 4889 kg - Moment of inertia: 4620 kg*m^2 - Moment arm length from center of mass: 1.5 meters - Force on moment arm tangent to mass: 1779 Newtons Homework Equations torque = force...

Hello, I'm a complete noob on the robotics. I got an idea, to build a really cheap robotic arm (~$60). I thought about using 4 servos (rotate the arm, move up/down the first part, move up/down the second part and open/close the grippers). As the bone material I found that 1m aluminium tube (2mm...

Homework Statement The diagram is attached. It is asking which position has the greatest lever arm.Homework Equations The Attempt at a Solution So, I know that the elbow is the fulcrum but what I'm struggling with is how to draw the force arrow. Where is the force coming from and where is it...

Homework Statement The arm in the figure below weighs 37.1N. The force of gravity acting on the arm acts through point A. Assume that L1 = 0.0720m, L2 = 0.300m and α = 11.8deg. Point A is 0.300m away from the pivot point. Fs is unknown angle degree from the horizontal. a) Determine the...

To find the respective torque that is need to bend the the arm at 180 degrees, 90 degrees and 30 degrees. The arm is not holding anything. Relevant equations and information τ=rFsinθ total arm weight =3.35kg upper arm length =19cm forearm length =28cm

Hej Guy, Here I am again with a question on torque basically. Please see the image below. I have a half tube underwater. The tube have air inside. Now I would like to calculate the torque for this system. As you see the tube will move to a balanced position, but I don't how much torque...

I'm working on a research project as a graduate student in engineering. I'm modeling a set of equations in Simulink and MATLAB derived from a journal entry. I'm a little rusty on classical mechanics as my specialization is electrical engineering. I want to model the angular torque on a hub as...

Here is a tricky one (for me) that uses linear mass density and two masses. I don't really know which to do so I did both! Homework Statement An object can be hung from a string (with linear mass density μ=0.00200kg/m) that passes over a light pulley. The string is connected to a...

The Milky Way is a Barred Spiral Galaxy 100,00 -120,000 Across. I was wondering if there is a website or list of what Stars of Constellations exist in what Spiral Arm. I there exists: Orion-Cygnus Arm Perseus Arm Scutum-Centaurus Arm Norma and Outer Arm Carina-Sagitarius Arm...

Homework Statement What is the Force Needed in the X direction? I have a 500 lb Car and attached to the Wheel axle is a 12 inch long lever arm going straight down. The pivot point is at the axle and a cylinder is pushing the arm at the end of it. What force do I need to push this 500...

Homework Statement A board is set on top of a scaffolding, with dimensions as shown in the diagram. The board weighs 15 kg. A man weighing 70 kg stands on the board as shown. How far out can he stand before the board falls? Homework Equations Torque: \tau = rFsin(\theta) Force due...

I tried googling on it, but can't find the answer, maybe the keywords doesn't accurate so always led me to definition of each ARM registers instead of what I want to know. What I want to know is: is there any tool for ARM that give some statistic on register usage? for example giving...

Hey. Working on a project at the moment, where i have to simulate a human arm (hand and lower arm). I need to find the spring constant, k, and dampening coefficient, c. You got any good ideas on how i can do that? So far i tried by measuring the mechanical impedance, and saying the arm is a...

The attached question shows a simply supported beam with a UDL of 30kN/m and has a rigid arm underneath with a load. This question was a research one but unfortunately I have had no luck. I thought that this could be solved by doing moments for the arm but am unsure on whether that would...

I need to find what spring will balance an arm at 45 degrees the arm is 5m and can be considered as a UDL of 1.6kg/m the situation is that the arm starts upwards at 90 degrees and as it goes down it puts tension on the extension spring 5*1.6 = 8kN acting 2.5m along the beam which is...

Hello, I hope I'm posting in an appropriate section. I'm trying to make a robotic arm using servos, but I'm not too sure what the max weight and lever arm length I could use. I know how to do the static torque calculations, but not too sure with the dynamic and rotational torque as the motors...

I am working on creating a mid size trebuchet with a projectile arm length of 3 feet. The counterweight is about 3500 grams, with the projectile being 60 grams. I know that the ratio of the projectile arm length to the counterweight arm length changes depending on several factors, most...

Hi, I'm an electric engineering student and I'm want to initiate a project to control a robotic arm. But i must first choose which arm i will work on and where to buy it. I want to make a position control, so i will need a feedback of the actual position of the arm. The control will be made...

http://www.reuters.com/article/2012/05/16/us-paralysis-robotics-idUSBRE84F1CM20120516 This is a remarkable achievement by the scientists. Now, we don't need limbs any more? :P I wonder how did the scientists find out where to connect each electrodes? How did they know which portion sends...

Hi, I haven't done beam deflection before. My textbook shows the usual simple beams with a perpendicular force acting on it. This one is a lot more complicated. I'm pretty sure the forces acting in the horizontal direction have to be added into this some how. Can someone look at the...

I'm trying to make an elbow joint for a robotic arm that is actuated with a stepper motor and two gears. Here's a quick sketch of what I'm trying to do: http://imgur.com/mBlg7 The two bottom plates will be attached to the 'bicep' and the two upper plates will be attached to the 'forearm.'...

So an electrical motor converts electrical energy to mechanical one. But an electric motor can just produce a single motion in of itself. How come connecting a mechanical arm to it allows a diversity of movements like rotation, verticial and horizontal motions to both directions!?

Hey, I'm looking for an explanation of the why we observe T = F * d In the sense of two people applying a force to a lever arm and the person closer to the pivot point requiring more force to keep the torque in equilibrium. I can only find explanations in the sense of work and energy...

If the word eccentric is not used correctly, please correct me.Homework Statement I am constructing a mathematical model of trebuchet throw. For the throwing part, I simply use the relation ΔE_p = E_k , so the change of potential gravitational energy goes into the rotational kinetic energy. I...

Hello, I am after a little help on an applicaition, I need to calculate the force require to hold a pivoted arm in a position using a pneumatic ram. Basically the arms C of G is 740mm up the arm, and the arm weights 100kg. Roughly 1000N working at an offset of 147mm. The arm is 16 degrees...

LEASE HELP! -Add an axis to current rectangle -Draw both piece of arm -rotate object first axis 20 degree --redraw. -then, rotate 2nd part about 2nd axis to -30degree my current code for rectangle is %RECTANGLE('Position', [x y w h]) w=4.5; %width h=.5; %height x=1.75;y=2.75...

um, i placed my elbow on the table, and i think i mustve hit some ideal spot that actually caused a (static?) reaction up my lower arm. what i want to know is, what exactly it is, why did it happen, and why it only happens sometimes?

Homework Statement The arm of a crane at a construction site is 15.0 m long, and it makes an angle of 15.8 with the horizontal. Assume that the max- imum load the crane can handle is limited by the amount of torque the load produces around the base of the arm. What maximum torque can...

Homework Statement Suppose the length of your forearm is 34cm and its mass is 1.3kg. If your bicep inserts into the forearm 3.5cm from the pivot (the elbow), and your biceps muscle can produce a force of 800 N, how much weight can you curl? Model your forearm as a uniform rod. I have no...

Homework Statement A traditional watch has a second hand 2.0 cm long, from centre to tip a. what is the speed of the tip of the second hand? b. What is the velocity of the tip at 20s? 40s? and 60s? c. What is it's change in velocity between 15s and 30s? d. What is it's average...

How does a programmer programme a robot arm offline?ANd through what ways?

Homework Statement The coordinates of a point P on a terminal arm of an <Θ (theta) in standard position are given, where 0<Θ<2pi. Determine the exact values of sinΘ, cos Θ and tan Θ 2h) (-2,6) Homework Equations r= X +y The Attempt at a Solution So, first i found r by...

Good day everyone: I am planning on automating a robotic arm that is in my school's Instrumentation and Controls lab for my senior project, but I would like to know what are the things that I would have to take into consideration. What are the Steps that I would have to take to get this...

One arm of a Michelson interferometer is one light second long, the other is one light minute long. We run photons through it one at a time. Do we see interference? And if so, when? After one second? One minute? Some other time? I've been reading a number (too many!) "layman's" books on...

Homework Statement I am figuring out the physics of the scene in the movie Get Him to the Greek where an actor falls into a pool but breaks his arm by hitting it on the concrete edge. Mass of actor = 73 kg Mass of arm = 4.75 kg Force to break an arm = 73 N Duration of fall = 3.0 s Homework...

Homework Statement The main muscle responsible for raising an arm is the deltoid. The deltoid muscle connects at the upper end of the shoulder, extends over the upper arm bone (humerus), and attaches near the elbow. Effectively there are three forces involved in raising the arm: (i) the force...

For some of the questions questions the initial arm is in the positive x and y quadrent and the terminal arm moves counter clockwise (+)this is considered positive , for some of them it is in the negative x and positive y quadrent, how does one determine where the initial arm is to be placed...

Homework Statement This isn't a homework problem, but I'm trying to do the calculations for a catapult I built to see if its actual performance matches the theoretical performance. I'm stuck trying to map the trajectory of the projectile. Here is the picture for reference...

So here's the problem: Bodybuilder “Hulk” Heise is doing leg curls on a Cybex machine. “Hulk” gets stuck (see figure) with 90° angle at the knee joint. The force exerted by the machines (FA) on his leg is 500 N, directed at an angle of 55° (angle α) relative to the tibia, and the distance...

I am design a three jointed robotic arm that can lift 40 pounds. A diagram of the arm is attached. How can I calculate the torque needed at each motor to lift the 40 pounds?

Homework Statement Homework Equations So moment and torque are really the same, right? so the force times the distance. The Attempt at a Solution The force used has to be perpendicular to the line of the radius about O, so I assume I must do cos(36)*6lb*5in for the first. The...

Hello... Am undergraduate EE, and am working on my final year project which is the development of prosthetic arm which will work on signal from muscles taken from surface myoelectric sensors. First of all i will explain about circuits i want to build, and i wish i will have comments...

Homework Statement Homework Equations T=rF The Attempt at a Solution I'm not sure at all how to solve this problem. If anyone can help me out with setting this up and proceeding from there that would be a big help.

Hello.. Am an Electrical Engineer, my FYP concerns the artificial limbs... I made a small research about the nervous messages, and how it flows from the brain until it reaches the muscles. In the arm i found that there are 3 nerves (Ulnar, Median, and Radial nerve) which are responsible for arm...