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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23
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1answer
75k views

Understanding required torque for a motor lifting a weight

This is a continuation of me trying to understand torque and stepper motors in my other question. I'm trying to understand the torque a motor would be required to generate to lift a small weight, and ...
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3answers
131k views

Calculation of Clamping force from bolt torque

I'm trying to calculate the clamping force resulting from torquing a nut and bolt to a particular level. I have found this formula in various forms in a lot of places. $$T = KDP$$ $T$ = Torque (in-...
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3answers
1k views

Compound gear system ratio

This might be a stupid question, but I'm new to mechanics, so please bear with me. Suppose I have a compound gearing system defined in the image below (not to scale). The green gear is the driving ...
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5answers
24k views

What is Starting Torque?

I'm having a hard time finding an answer from the internet. What does starting torque mean?
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4answers
3k views

What is the use of gears in a device with a fixed gear ratio?

From my understanding, there are two uses of a gearing system: to change the speed of output rotation (trading it with torque), and to change the axis of rotation. Now, in a car, for example, it is ...
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5answers
992 views

Ways to brake an axle

I am currently studying Mechanical Engineering and am doing an assignment where I have to design a wire rope tensioner where a wire rope is unspooled from a drum, but the wire has to be at a specific ...
6
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3answers
978 views

Three-phase versus single-phase operation of a generator

My generator (a Fermont MEP-803A, 4 cyl diesel, 10kW rated) can run in three distinct modes: Single-phase 120V, in which one terminal is hot, and another is neutral Single-phase 120V/240V, in which ...
6
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4answers
3k views

Torque converter torque multiplication

I keep reading all over the internet that a torque converter multiplies torque at stall speed. Every explanation I have found sounded more like hand-waving than quantitative physical explanation. ...
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6answers
969 views

Mechanical mechanism that regulates gear's rotational velocity

Please do note that I am a civil engineer not a mechanical engineer. I have a gear that rotates at a speed that varies with time. Usually, it rotates at speeds higher than the desired speed. Is there ...
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3answers
1k views

What would happen if we tried to run a motor in space when it is not attached to anything to provide support to it?

I know that when a motor runs it generates torque and that torque can be used to do useful work. On the other hand, the motor needs strong support that absorbs the reaction torque. In our case let us ...
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6answers
7k views

Why do drag race semi trucks slant to one side?

I've been watching drag races of semi trucks and found that, especially during the initial phase of acceleration, they all bend to their right-hand side. I understand, that the huge torque in rear ...
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1answer
359 views

What is 'No Detent Torque'?

I am learning about Variable Reluctance ( VR ) Stepper Motors. As stated in my reference, they "have no detent torque." What does this mean?
5
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1answer
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"Heavy-duty" or not, can my drawer slides really support this weight?

Okay, so recently I got a Dewalt 735 Thickness Planer. It's great at what it does. (It even LOOKS like it's ready to consume the tender flesh of lumber, like some twisted Victorian lumberjack... ...
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1answer
105 views

What should be the angle of the motor to the base?

I have a boat that uses a propeler above the water. The propeler blows the wind to the back of the boat and it makes the boat go straight. There is one problem with this approach: I am using a big ...
4
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1answer
3k views

How to calculate if a motor is capable for a load?

I am trying to figure out if a motor I have is capable of spinning a wheel. Here is all of the information I have: MOTOR: 190 g.cm min. WHEEL: 26 cm diameter, weighs about 59 grams I imagine that I ...
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3answers
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Is twisted belt configuration a good practice?

Internet is full of twisted belt examples (30, 60, 90 degrees), however, the allowed misalignment tolerances claimed by the manufacturers are less than several degrees. The very term misalignment ...
4
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5answers
198 views

Preventing a DC motor from stalling

My team is trying to build a mechanical cannon for a final project for a course and we are running into some problems with our motor stalling. Our motor stalls when the plate hits either side of this ...
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1answer
719 views

How can I accurately measure the actuation force of small buttons (<1cm diameter) using home equipment?

I'm trying to measure the actuation force of buttons on the Playstation Vita, in preparation of building an external device that presses these buttons automatically. Specifically, I'm trying to ...
4
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2answers
770 views

How to connect a motor shaft to a plate

I'm trying to drive an aluminium plate using a motor via a 20mm-wide 2mm-thick stainless steel tube. The tube is driven by a 6mm motor shaft via a pulley and the torque will be around 5Nm at most. Is ...
4
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2answers
218 views

Linear actuator behind lifting boom

This is a follow-up on my previous question here: Sizing a motor for a floor jack-like mechanism The floor jack setup is clearly inefficient when it comes to electric actuators. Something similar to ...
4
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1answer
356 views

What is the required torque to rotate a 50mm aluminimum plate of weight 100g?

I have a aluminium plate of radius 50mm and thickness 4mm. How much torque is needed to rotate it? In case additional information is required : I have a RS 380 motor, but I guess torque required is ...
4
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1answer
2k views

How to Calculate Mean Radius of Irregular Contact Face (Torque Transmission)

In a simple situation, one simply takes the average of outer diameter and inner diameter to gain the mean radius for calculating torque transmission through a contact face, such as a clutch. But how ...
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0answers
75 views

Equation for the spring constant of an orthotropic, rectangular wire spring

I hope I can get some help with this problem as I've been struggling with it for a long time. I have a helical tension spring with radius $R$ and a square wire cross section and made of orthotropic ...
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0answers
139 views

What is "Torque Break"?

I am looking at the specifications for thread lockers, and henkel/loctite specify "Torque break" and "Torque prevail" in in./lb. as shown in the link below: http://www.na.henkel-adhesives.com/...
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1answer
717 views

How can I calculate the power and torque required for the motor on a wheeled robot/vehicle?

How can I calculate the power and torque required for the motor on a wheeled robot or vehicle if a particular acceleration or movement up an incline is required?
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3answers
266 views

Mechanism for controlling the clamping force

I am working on upgrading a research project on wind energy. They are trying to measure the performance of wind blade designs in a small wind tunnel (i.e. their models are relatively small). What they ...
3
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2answers
1k views

Why is there a moment at the cross section end when you cut a body?

I just started mechanics of materials, and it seems that my knowledge from statics has gotten rusty over the summer. But there was a new concept introduced in the first example problem today. There ...
3
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3answers
150 views

Fun Force Problem - Basic Structure of Two beams supporting weight

I'm very new to engineering and thought I'd start with some basic problems and test them out with my own constructions! I've come up with this fun problem and would love some help solving it. Say you ...
3
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3answers
504 views

Why diesel engines are considered steady torque engines?

Diesel engines are considered "steady torque", which means that torque is same no matter the revolutions whereas torque depends on revolutions for an engine that runs on Otto cycle. What is the ...
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3answers
159 views

Why in the construction of power transmission towers , the rods are hinged oblique? [closed]

I know if a rod is hinged at its two ends and if there is no load act upon it along its length then the forces exist only along its length but i don't see how this characteristic comes into play ?
3
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1answer
89 views

Gear acceleration and maintaining torque

If trying to achieve a 1:4 gear ratio, will a planetary gear system help reduce the loss of torque? Or is it essentially no different than the loss of torque when using a large drive gear to rotate a ...
3
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2answers
42 views

Would friction forces impact a torque measurement transmitted through a gear box

I want to be able to detect very small torques placed on the end of a cantilever beam. These torques are very small - 1mg by 10cm. I am trying to make this on the cheap and use a load cell. I plan ...
3
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2answers
4k views

Torque required to launch a tennis ball

I am trying to find out if the 12 V DC electric motors that I have are powerful enough to launch a 100 g tennis ball 30 m away. The tennis ball is put down a pipe and ends up wedged in ...
3
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1answer
158 views

What is the maximum force needed to move the roller block from point A to point B and where does that maximum force occur?

Hello everyone. This project is for a very specific application and I am trying to determine the force necessary to get the block from point A to B. Specifically the maximum force necessary and at ...
3
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1answer
50 views

What does the Torque vs Frequency plot mean for a stepper motor

I found this motor which I believed had interesting specs, but when I checked out the data sheet, the torque-speed graph was replaced by a torque-frequency graph! I do not know what it means. How does ...
3
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2answers
1k views

How to calculate torque needed to stop a rotating beam over x seconds

I have a large boom of a radio antenna weighing $3,500 kg$ which is rotating at $0.5 RPM$. The antenna is a T shape and the boom radius is $14m$. The power to the motor is cut off suddenly and the ...
3
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1answer
4k views

What determines the maximum torque of a DC motor?

What determines the maximum torque of a DC motor? How is this related to the equations $$E=k\omega$$ $$T=kI$$ where $E$ is electromagnetic force / voltage (V) $\omega$ is rotational speed (rad/s) $...
3
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1answer
52 views

Controlling torque required to turn a shaft

I have an shaft/crank that will be turned by the user. I want to precisely and dynamically control the torque required to do so. For simplicity we can think of it as a exercise machine (so the torque ...
3
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2answers
199 views

torque required to lift an object

I have a mechanical engineering question that I can seem to figure out. Basically I have an object this is being pulled down by two forces. Each force is 10N in the downward direction. There is a nut ...
3
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1answer
2k views

Equation of motion for 2-link arm

I have the following robot arm: Now how do I obtain the equation of motion: $$ M \ddot\theta + \vec{b} + \vec{g} = \vec{\tau} $$ I am familiar with forces, torque, velocity and so on. I know that ...
3
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0answers
74 views

PMDC Motor Characteristic Graph

I am trying create a graph similar to as shown below. However, I am confused as to how the torque is related to the characteristics. The graph that is to be replicated for certain parameters: The ...
3
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1answer
66 views

Determining the required specs of Stepper Motor

Being a non-engineering type, I'm trying to calculate what power and torque I would need from a DC stepper motor to execute a particular task. I'm certain that my question will open me up to ...
3
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1answer
6k views

Computing winch maximum line pull (torque vs lift capacity)

I am trying to ascertain the maximum line pull for an old winch I have in my workshop and I am arriving at values that are considerably higher than what is in the original manufacturer's manual. I am ...
3
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1answer
785 views

Determine coefficients of friction based on the torque required to rotate a part on a shaft

I'm trying to model a part that rotates on a shaft. I measured empirically that it has a static torque of around 500 N·mm and a dynamic torque of around 400 N·mm. I want to simulate it in CAD but my ...
2
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1answer
5k views

Calculate torque for a cam

How do you calculate the torque on the cam, with a force placed on the follower? Two possibilities: Linear cam (schematic) Radial cam (schematic)
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2answers
176 views

Non-Clutch Vehicle Drivetrain - How Does it Work?

I am making a vehicle simulation, but just noticed a big issue - there are a lot of cars with no clutch in them, but I haven't driven a car with automatic/clutchless-manual gearbox, nor been even a ...
2
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2answers
2k views

Steering wheel torque when car is turning

How can I calculate the torque that is needed to keep the steering wheel at the same steering angle during turning at given speed? Example case: A car with Ackermann steering geometry weights 1000 ...
2
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2answers
239 views

How do you calculate the shear force on the screws that connect a door to a jamb via hinges

I'm trying to calculate the shear forces on hinge screws or bolts. Here is a schematic of the door with the relevant values: First, I took a free body diagram of the door and its hinges. The ...
2
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1answer
64 views

How much should I adjust torque specs for lubricated threads?

The factory manuals for motor vehicles give torque specs for most nuts & bolts. My (possibly incorrect) assumption is that these are for dry threads as would be used in a factory where no oils or ...
2
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1answer
64 views

Modeling the torque of a real motor

I am trying to control a real inverted pendulum by means of a DC motor, for this I must model the torque of the motor, the work I've done in this direction is the following (which I believe is right): ...

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