Calculation torque of a drive at the torque arm

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The discussion focuses on estimating the torque for a mixer, specifically at the turnbuckle located 23 inches from the driven shaft. Participants suggest that a strain gauge may not be necessary, and instead recommend monitoring the current of the 3PH motor or using a clamp meter to estimate torque. Clarification is requested regarding the system's layout, including the need for a sketch to better understand the setup. There is also a mention of the relationship between torque and the tension applied by the turnbuckle. Accurate torque measurement may depend on understanding the mixer’s operation and load dynamics.
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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.



This is over my head.
 
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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.

1695655078327.png


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
 
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.
 
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