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Questions tagged [force]

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How to account for end effector orientation when calculating thoretical holding force?

This is in context of a robotic arm whose tip is attached to a vacuum gripper. The theoretical holding force of a vacuum gripper is given by, $$ F_H = m(g+a)S$$ which is, $$F_H = (F_g + F_a)S $$ ...
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1answer
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How to calculate effort/torque values of a joint

I have a robotic arm with 6 DOF. For each joint, I get get the Joint Wrench, which is composed by the force and torque of the parent and child links of the joints. In other works, for joint 1 I can ...
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1answer
18 views

DJI E310 Thrust Coefficient

I am reading Denis M. Filatov et al.'s paper "Parameters identification of thrust generation subsystem for small unmanned aerial vehicles" (https://www.semanticscholar.org/paper/Parameters-...
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1answer
32 views

Calculation of inertia values of Ic and Im

In my dynamic model of two wheeled mobile robot, it has the total equivalent inertia, noted $I$, described by the equation below, $I_c$ is the moment of inertia of the DDMR about the vertical axis ...
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Compress a spring with Makebock parts

I would like to build a mechanism with Makeblock parts, which would compress a 10N/mm spring with relative precision (max 200N on 2cm). I have several ideas in mind, but I am unsure which is the best ...
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27 views

Simulate weight with CMG or Reaction Wheel

I want to make a glove that can simulate a force, like a weight for example, on the hand of the wearer. I though that maybe reaction wheel or CMG (control moment gyroscope) could do it, if it can ...
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0answers
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From a linear force actuator that spans multiple links and joints to the equivalent motor torque

I am programming/using a rigid body joint-space dynamics solver for robots in which I want to implement linear force actuators between links with their equivalent torque sources that are 'spanned' by ...
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1answer
47 views

Will this have more or less lifting strength

Bit of an engineering question. If a snake robot is 100 cm long, and every 10 cm is another motor. Would the robot lift more weight, the longer/more motors attached to it.. or is lifting ability ...
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2answers
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What is the torque/force required to rotate the base of a robot arm?

Take a look at the following simple example robot arm: I want to know the torque required on that bottom motor to rotate the arm. Since it's not exactly rotating directly against gravity like the ...
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3answers
337 views

how to find maximum force of a robot joint

I want to know if there is any equation that calculates the maximum force of a robot joint. The force that we should not exceed. For example in human leg, if we apply a big external force to the knee,...
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2answers
203 views

What are the best ways to transmit force through air efficiently?

I am taking part in a robotics competition, where the challenge is to create a pair of robots which successfully navigate a series of obstacles. However, the rules state that of the two robots, only ...
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2answers
104 views

Magnetic, low insertion force connector

I'm building a robotic tea-maker/watchdog robot and have a power problem. I would like to be able to have the robot approach a socket and insert the power cord of a cheap immersion heater (120V, 300W, ...
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1answer
332 views

Verifying motor selection calculations

I'm trying to select a brushed DC motor for a project. I tried following the advice on sizing electric motors, mentioned in this question, but a few details were missing, and I'm unsure if I properly ...
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0answers
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Unilateral Torque Constraint on the foot-ground interface

I was studying the basics of legged locomotion and came across the unilateral force and torque constraints at the foot-ground interface. I understood the implication of the unilateral constraint on ...
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1answer
48 views

Calculating the force of this system

My native language is not English, so I don't know all the specific terms you may expect me to use. I apologize for that. Anyway, I have a motor and three connecting rods (in French, bielles). So ...
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2answers
201 views

Is there a rule of thumb for actuator torque overhead?

When installing a servo or other actuator, I measure the force needed to perform whatever action is needed and find an actuator that can generate more than the necessary force. However, I recently ...
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0answers
137 views

Dynamics of parallel manipulator

My task is to apply forces to control 3-dof parallel manipulator. Forces are applied to linear actuators, friction is neglected. End-effector of a robot is supposed to follow generated path; for ...
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1answer
156 views

Wind force impact on torque mechanical arm

I've got an arm attached to a shaft. The arms dimensions are 40x5 inches the arm weights about 10 lbs. If I have a wind acting on the side of the arm, how would I translate the wind force into torque ...
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0answers
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Force measurement on grab bars [closed]

I recently start a project to measure the force on a bathroom grab bar. The force/load is applied by the person who need to the grab bar for assistant. What I want to measure is the load against the ...
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2answers
8k views

How do I calculate the required loop frequency for a servo controller?

I have a motor which drives a string connected to a load cell. I would like to implement a closed loop controller to control the load applied by the motor to the string. How do I go about determining ...