How do angle torque wrenches work.
"Tighten to 80lbs/ft and then another 90°"
I get the torque setting but how does it know when you have tightened it another 90°?

 

I assume you know how to tighten to 80.
Now change to a different tool and turn 1/4 turn.

 

I assume you know how to tighten to 80.
Now change to a different tool and turn 1/4 turn.

But some of them can measure the 90° for you but I don't understand how they can do that.

 

 

The 90° is not critical, so a visual estimate of that should be fine.

 

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Yes I've seen those being used, But there are some that seem to work just like a torque wrench and beep when the specified angle is reached. I don't see what they are using as a reference.
See this from 1 minute in. He says it is using a gyro to measure the angle!

 

It's not a "Gyro", it's a common Compass-Chip.

These are found in every every Drone, and most Model-Airplanes.

Even many modern Cars Contain a Compass-Chip,
this can be used as a part of the Traction-Control-System, or simply a Compass-Display for the Driver.

Most Cell-Phones also have a Compass-Chip built-in.

A "Gyro-Chip" usually measures Acceleration in 3-Planes,
sometimes the 2 separate functions are integrated into a single Chip.
.
.
.

 

Too much worry about a non problem. 80, 90 100° will not matter. I might mark the nut with a line so I know where to stop but normally not even that.

 

it's going to be closer to a gyro than a simple compass as you need to be able to use the wrench in any plane besides a simple horizontal one that a compass would normally be used at.

I believe the question was "how do these wrenches work" rather than how do you measure the angle when you do it.

 

Too much worry about a non problem. 80, 90 100° will not matter. I might mark the nut with a line so I know where to stop but normally not even that.

Depends. For most stuff you're right but not all.

I had to use MILSPEC requirements for mounting sensors to the bottom of ships hulls. There were preload, torque and rotation specs for hull penetration bolts that required signatures and full calibration data for all tooling used. The mech engineer designed the spec's and we followed it to the letter.

https://engineeringlibrary.org/reference/threaded-fastener-preload-mil-hdbk