# Calculation torque of a drive at the torque arm

• durwoodb
durwoodb
TL;DR Summary
torque calculation
Hey Guys,

I'm looking for any help in determining what the estimated torque would be on our mixer. If you know of someone that can help with this please let me know and maybe forward this to them. We are looking for a device (strain gauge) that can display this and we will need to know estimated torque at the turnbuckle in order to spec this out. Any suggestions on a device for this would be appreciated.

3PH/ 60 hz./ 480vac 60 HP Motor (177ft/lb torque)

25:1 reduction with gearbox

2:1 reduction with sheaves

I'm looking for the torque at the turnbuckle which Is 23"R from the driven shaft.

Let me know if they need any additional information.

Welcome to PF.

Isn't a turnbuckle used for applying tension? It takes torque to turn the turnbuckle to apply the tension, but once it is set there is no torque to measure. You can just use a torque wrench to measure the torque applied to the turnbuckle while tensioning it.

https://hartru.com/products/turnbuckle

C'mon @berkeman , don't you know we are all mind readers here? Lol. I'm assuming there is a turn buckle involved with positioning parts of a drive system and the amount of torque on something is reflected by the tension of a turnbuckle somewhere. Seriously it cannot be expected to solve any part of this with the information given

berkeman
To the OP: These experienced people (note their post counts) are trying to tell you that we really need a sketch of the system. A hand sketch is good enough - just scan or photograph it, then use Attach files to attach it to your next post. A photo of the mixer would also help.

We also need to know if you want the force on something, or the torque at a particular location. If the terms force and torque are confusing, search those terms. We can then help clarify any confusion with what you find.

We can solve the problem.

Is this machine like a rotating drum concrete mixer?
What is the RPM of the 3PH motor?
Would a tension measuring strain gauge be in line with the turnbuckle?

Rather than using a strain gauge, you might estimate the torque on the mixer, by simply monitoring the current to the 3PH motor. That might be done with a clamp meter.
Another similar way would be to measure the phase slip, or the load dependent speed reduction, of the 3PH motor under load.

Baluncore said:
Rather than using a strain gauge, you might estimate the torque on the mixer, by simply monitoring the current to the 3PH motor.
As a cement mixer operates, half of the drum is raising the mix. Wouldn't the torque needed to raise this weight show as an unbalanced load on the base. The unbalance could me measured and the radius of the drum (suitable modification) would give the torque.

## What is torque and how is it calculated?

Torque is a measure of the rotational force applied to an object. It is calculated by multiplying the force applied by the distance from the point of rotation (lever arm). The formula is τ = F × r, where τ is the torque, F is the force, and r is the distance from the pivot point.

## How do you calculate the torque of a drive at the torque arm?

To calculate the torque of a drive at the torque arm, you need to know the force being applied and the length of the torque arm. The formula is the same: τ = F × r. Measure the force applied by the drive and the distance from the drive to the pivot point to determine the torque.

## What units are used to measure torque?

Torque is typically measured in Newton-meters (Nm) in the metric system and foot-pounds (ft-lb) in the imperial system. These units represent the force applied over a distance.

## What factors can affect the torque of a drive at the torque arm?

Several factors can affect the torque, including the magnitude of the force applied, the length of the torque arm, the angle at which the force is applied, and any friction or resistance in the system. Changes in any of these factors can alter the resulting torque.

## Why is it important to accurately calculate torque in mechanical systems?

Accurately calculating torque is crucial in mechanical systems to ensure that components operate safely and efficiently. Incorrect torque calculations can lead to mechanical failures, excessive wear, or even catastrophic breakdowns. Proper torque ensures that systems function as intended and maintain structural integrity.

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