# Questions tagged [torque]

Torque is defined mathematically as the rate of change of angular momentum of an object (in physics it is called "net torque"). The definition of torque states that one or both of the angular velocity or the moment of inertia of an object are changing. Moment is the term used for the tendency of one force to rotate an object,but not necessarily to change the angular momentum of the object (the concept which is called torque in physics).

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16 views

### Calculating the torque of multiple nuts

I need to press hockey puck scr to a certain force, so I must hold it between two plates and by bolting plates apply that specific force to the hockey puck. I am using the torque wrench and 8 bolts, ...
24 views

### How could I calculate the torque due to lift and drag in the body frame?

I'm trying to figure out the torque due to aerodynamic forces on an aircraft confined to two dimensions (so no sideslip). Defining the windframe with basis vectors $\hat{w_1}, \hat{w_2}$ obtained by ...
34 views

### How does the thrust rating of a push rod/linear actuator (I've seen it in both kg and N) relate to the amount of weight it can move?

I'm working on a custom RC project, and I'm needing to move a lever with a "weight" of 5 lbs. 5 lbs is required to actuate the lever, and I need to push it 5 mm. Gravity does not affect the ...
176 views

### Why is retorquing sometimes necessary and other times a mistake?

Bike mechanics will implore amateurs not to retorque a bolt. One must first undo the bolt and then retorque. Yet car wheels specifically require retorquing on a different day soon after installing the ...
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### Which beam deflects and twists more, open section or closed section?

Two beams, one open section (like an I-beam with flanges and web) and the other closed section (like a hollow square section) are cantilevered and have the same overall cross sectional moment of ...
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### How much torque is required to lift 27 kg at 1 m distance to go 90° in 8 seconds?

strong text I know 27 kg × 9.8 ms-2 = 264.6 N Torque = 264.6 × 1 m = 264.6 Nm but how much required to go 90° in 8 seconds?
1 vote
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### Counter-intuitive behavior of chain drive

In a chain drive system, sprocket 2 has a motor attached, sprocket 1 is being driven. The blue construction is static and immobile. Before starting the motor, both load cells show 0 (tare). ...
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### Gyroscopic precession

My question is about a school project I am working on; a beam can rotate freely on the horizontal axis. If one motor (or multiple) is attached far from the pivot the beam should rotate. I am trying to ...
54 views

### How do AC servos have constant torque region?

I have been learning about AC servos for a project. As i look through the torque speed curves, I get stuck. I understand how to use them, but I am baffled by the shape. I was always taught that there ...
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### Is it possible to simulate inertial load using brake?

Suppose to have an engine attached to a flywheel, I add power, the flywheel start to rotate and oppose a resistance to motion. More power, more resistance. I'm wondering if I can simulate this ...
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### Does an off the shelf electromechanical device exist that does rotary oscillations

Does an off the shelf electromechanical device exist that does rotary oscillations? Similar to a torsion pendulum motion or a rotary spring but gets some energy supplied by electrical means to help ...
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### How do I relate tongue weight to weight x distance?

The specification for car hitches routinely state the tongue weight, but do not specify how far that weight can/should be applied. What am I missing? Shouldn't the maximum bending moment be the one to ...
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### How to look for a stronger electric motor for a DIY candy panner?

I'm an amateur working on a candy panner project, similar to this one but with a dedicated motor instead of an attached drill. After some experimentation, I have a working V1 that I successfully used ...
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### New to AutoCAD, trying to accomplish a simple task of trying to simulate how much force can a U channel withstand

Sorry if my question or parts of it seem vague or stupid, I'm fairly new to mechanical engineering. I'm part of a team that is building a simulator platform and I am mostly at the helm of the software ...
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### Worm drive vs Cycloidal Drive

In robotics, I've seen quite a few people make use of cycloidal drives. They seem robust, compact and have a relatively simple design, while still achieving high reduction ratios. Yet outside robotics,...
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### Geared Motor vs Direct drive with external gearbox

I'm looking to buy a small DC motor (~12W) which rotates at around 60rpm. I have two options: Get a geared motor which has an integrated gear box such that the output shaft rotated at 60rpm. Get a ...
311 views

### Calculating forces of TV wall mount with long extended arm. Need help with Physics, torque vs force and anchor requirements

I'm planning to install a wall-mounted TV with a very long arm on a plasterboard wall, although conventional wisdom advises against it. The TV mount is 45cm wide with holes for 6 screws. To address my ...
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### What is the maximum torque a cylinder can withstand without turning when clamped by 2 set screws?

I am trying to calculate the maximum torque a cylindrical body can withstand when clamped by 2 set screws. The cylinder is placed in a housing with a sliding fit against housing surface, and the ...
148 views

### How do I determine the moment of force that would have to be applied to the shaft to open the gate in this question on fluid statics?

I am presently studying fluid statics from Munson's textbook. I do not understand part (b) of example 2.6. The full question is as follows: GIVEN The 4-m-diameter circular gate of Fig. E2.6a is ...
61 views

### How much torque does an engine produce when slowing down with no throttle?

If I rev (for example) a small 1.5L 4 cylinder engine up to 4000 rpm in neutral then let off the accelerator (gas) pedal completely, how much torque will the engine produce as it slows down? How long ...
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### Choosing the right motors for an electric wheelchair

I'm currently building an electric wheelchair. It will have to carry a maximum weight of 600 lbs. I'd like it to have a max speed of about 1.5 mph. The tires I'm using have a 9 inch outer diameter. ...
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### How can I transmit the force induced by magnetic torque?

So I'm working on a project where I'm trying to transmit the force induced by magnetic torque onto people's hands, thereby making it a haptic feedback system. This is the stucture that I designed to ...
141 views

### Different installation requirements for normal bolts vs torque-to-yield bolts

Why do stretch bolts need to be rotated 90 or 180 degrees after being torqued to a specified value? Why not just torque it to 120 nM instead of 100 nM + 90 degrees of rotation? Also would it be ...
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### Is there a torque wrench you can use a "Cheater Bar" on?

Do there exist torque wrenches whose accuracy would not be affected by the use of a "cheater bar"? https://www.teamtorque.com/frequently-asked-questions#:~:text=Q%3A%20Can%20I%20Use%20A,...
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### Need help in understanding torque and Spring Force

I have another question for the smart people on here!! I am working on a project and I need a better understanding of the forces. I have a torque applied from a torque driver of 0.7 Nm to screw down a ...
1 vote
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### Effective Designs for outdoor clothing elevator free from walls

A strange question, but I live in a building (gringo in Mexico City) where the only area you can dry clothes is in a set of chain-link cubes on the roof. However, those cubes are about a story and a ...
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### "move fast until resistance encountered, then gear down" mechanism?

This question may be too general, so apologies in advance if that is the case. I'm looking for a (relatively simple) mechanical system that will cause the driven element to move fast under no-load ...
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### How to calculate force acting on axle from hub motor with known torque?

In some electric bikes, a motor is mounted to the hub of the front wheel. When turned on, this hub motor applies a torque, turning the wheel, reacting against the ground, with a resultant force acting ...
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### Are there hydraulic torque converters that are specifically built to work like reduction gearboxes?

As far as I understood from this video, there are torque converters and fluid couplers (a hydraulic clutch), but certain types of torque converters kind of work by performing the two functions at ...
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### What are the physical implications of modelling a rider on a unicycle as a massless rod and spring attached to a point mass?

Foreword This is not an industrial question; I will not profit from any answers, and I am asking because it is the subject of my final year project at university. Also apologies to the US for using ...
1 vote
186 views

### How does 2nd gear create more thrust than 1st gear?

Let’s analyze a vehicle parallel to velocity and forces applying on it. The 1st gear has a maximum velocity value after which you can’t accelerate more. It means that thrust force on wheels generated ...
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### Torque for rotating base

I'm designing a simple robot arm but I don't know how to calculate the torque of the rotating base for the robot arm so I can choose the right gear ratio for the stepper motor that will be in the base,...
42 views

### Torque created at bottom left corner due to torque in centre of 2D box

If I have a 2D box with uniform mass of width $w$ and height $h$. I apply a torque $\tau_O$ to the centre of the box, labeled $O$. The box has a fixed point $A$ at the bottom left around which it may ...
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### What happens if we have a rotating shaft with high RPM but very little torque?

If there are heavy components mounted on it, what will happen? I think it accelerates very slowly, but reaches at the highest RPM at the end because torque is equal to angular acceleration * moment ...
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### Minimum torque required to turn a large gear

I want to preface this by saying that this isn't homework, it's just a question I've made up myself (so it could just be impossible to solve), and I am a beginner so apologies if I miss something ...
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1 vote
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### Does a parked car provide more engine resistance when left in a low gear or high gear?

I've heard that cars parked on an incline should leave the car in either 1st gear or reverse, because this supposedly provides the most engine resistance should the wheels start turning. But my ...
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### What does a torque flange measure?

If i mount a torque flange so that it connects 2 axles. Does it measure the difference between the torque applied to each axle?
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### Motor capable of 10Nm can barely lift 15lb

I have a 5.5 kW motor that I'm using for testing. I tried using it to lift a 15lb weight but it struggled. I reduced the amount of rope on the spool (there was a lot and then it was able to lift it at ...
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### How do I find the optimal position for a hydraulic damper to balance the force applied to a rotating assembly?

This may be a simple problem, my math and physics chops are a bit rusty. I'm modifying a flight sim rudder pedal to add a hydraulic linear damper (specifically a motorcycle steering damper). I'm ...
274 views

### Electric motor for low speed, high torque application?

Background For my mechanical engineering senior design project, we are designing a cargo transporter electric vehicle for off-road conditions. The vehicle needs to transport loads weighing up to about ...
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### Best placement for torque limiter?

Considering a stepper motor system that avoids the need for a limit switch, by turning until it can't turn anymore, and then a torque limiter takes up excess motion. When the motion stops, the shaft ...
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51 views

### Is there a type of motor or gear (or combination) that can match back driven resistance automatically?

For a fun project I wanted to try building a small workout machine based on the backdriving of a motor, that would match my force - or my force minus some small amount. Eventually I'd like to connect ...
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91 views

### Composite Beam Theory - Calculating torsion and beam deflection of a composite beam made up of a pipe inside a pipe

I am trying to calculate two things. First the beam deflection of my model after bending and second angle of twist after applying torque. My model is composed of two tubes (cylindrical hollow beams). ...
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### Angle of attack for torque calculation from buoyancy force

To calculate the torque caused by the buoyancy force I need the length and the angle but what angle should I use? Should I use the angle of from the center at the bottom of the angle from the center ...
77 views

### Are there hydraulic cylinders that provide thrust and at the same time transmit rotary motion from a motor to a generator?

I am searching for a practical factory-made hydraulic cylinder (actuator) that can provide an axial push of 140 kN against the shaft of the rotor of an electric generator and also transmit the 90 kNm ...
37 views

### How to match a synchronous generator with a powered shaft?

Given is a shaft powered by a steam turbine that rotates unloaded (i.e without generator) at $\omega$ rad/s and a torque of $T$ Nm. How would one match a generator to extract power requiring a ...
1 vote
265 views

### How much torque does a motor need to move 1500 lbs on a lazy susan 48 inch table

I make concrete flower pots. I had a drill mounted directly to a shaft that I used to turn the table when I made smaller pots. I now make much bigger pots, about 2' high by 44" at the top rim ...
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### How to calculate and of measure the applied force between a motor and a flywheel

I am making a model for a flywheel. For this model, I found a way to calculate the torque and thus eventually the velocity of the flywheel. The flywheel itself will be floating due to magnetic ...
When designing shaft keys we calculate compressive stress in hub/shaft/key and compare it with allowable stress. The usual formula is $$p = \cfrac{F}{A} = \cfrac{\cfrac{M}{R}}{L_e \cdot t}$$ where $p$ ...