Found the terrorist gleefully putting faulty rod bearings in all our cars

[///Marecki]

https://youtu.be/ZjFVV5HXU0Q?si=1QxN9hGMPKHvOB8W

Timestamp: 1:30 😄

No but in all seriousness, cool video - just wanted to share with the group.

[dr_011]

two characters

[sapote]

https://youtu.be/ZjFVV5HXU0Q?si=1QxN9hGMPKHvOB8W

Timestamp: 1:30 😄

No but in all seriousness, cool video - just wanted to share with the group.

terrorist? That's young Albert Einstein in the assembly line.

At 3:05 I assume the rod bolts are torqued down by machine. I wonder if the machine only tightened to a torque spec, or with the spec angle too? It was a quick continuous motion.

It has to torque 2 bolts at the same time, at this high speed.

[Cubieman]

terrorist? That's young Albert Einstein in the assembly line.

At 3:05 I assume the rod bolts are torqued down by machine. I wonder if the machine only tightened to a torque spec, or with the spec angle too? It was a quick continuous motion.

It has to torque 2 bolts at the same time, at this high speed.

I saw that and assumed the machine just got them tight then they go back later and use a traditional digital torque wrench? Or use the "2 in 1 machine" again but for final torque. Would be interesting to know.

[bigjae46]

So we're all torquing, loosening, torquing, loosening, torquing, loosening while these guys are zipping them on? Bullshit! hahaha

[maupineda]

More than surely those machines are calibrated to deliver the correct clamping force.

[bigjae46]

More than surely those machines are calibrated to deliver the correct clamping force.

Until they aren't!

Yeah, I'm sure they check the tools regularly and I'd imagine there is a post assembly check. The fact is handmade is cool but is also more error prone. Although if there is a culture I'd trust with this, it would be the Germans. 'Muricans? Whole different story.

[Slideways]

So we're all torquing, loosening, torquing, loosening, torquing, loosening while these guys are zipping them on? Bullshit! hahaha

Those are the early M11 bolts, ma'jae. Only one round of torque + angle

The machine appears to be doing the settling torque of 5NM. They don't show it in the video, but they probably do another pass with the rest of the torque sequence.

[sapote]

Those are the early M11 bolts, ma'jae. Only one round of torque + angle

The machine appears to be doing the settling torque of 5NM. They don't show it in the video, but they probably do another pass with the rest of the torque sequence.

I think the machine can be designed to get the initial torque, then the final angle, in one stroke. A computer monitors and controls the tightening speed via the quadrature encoder A/B signals, in a close loop speed control mode, and when the torque sensor triggers the set value, computer saves the current angle position (via the quad encoder data) at that moment, A1. Now the computer switched to position mode and drives the nut to the final position of A1 + 90 (or whatever the required angle). Doing so in one continuous rotation is the best way to achieve the precise torque spec.


Rotary torque sensor: https://www.ato.com/rotary-torque-sensor-10000-nm?affiliate=shopping&gad_source=1&gad_campaignid= 22574002217&gbraid=0AAAAAoOej0Z1gzyHYUUjxS_NnTwslp 1aw&gclid=CjwKCAjw3_PCBhA2EiwAkH_j4rTOMQ6mlUDF3kth d5zDcgNKVmUhG7ANVEHAdnQfInr-bBPM1ao_5BoCLl8QAvD_BwE

Quadrature encoder to measure the angle and speed: https://www.usdigital.com/blog/what-is-quadrature/

Both sensors are mounted on the driving shaft.

[heinzboehmer]

I'm on sapote's side. Don't see the benefit of designing a complex machine that just does the easy step of the sequence and then have an error-prone human do the hard parts. Torque + angle is easy peasy for a closed loop control system.

[Cubieman]

I want one!