I would like to build a ratchet mount angle gauge for bolt tightening. I asume that what I have to do is measure yaw. I'm using a MPU9250 to do this but I have a lot of drift when I integrate the gyro values which makes the measurement unusable. Is there any other way of achieving this? How are the comercially avaliable products able to measure yaw?

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    \$\begingroup\$ If the ones you mean are electronic, then they probably use a strain gauge rather than a gyroscope. \$\endgroup\$ – JRE Nov 9 '19 at 20:15
  • \$\begingroup\$ only use a gyro if you cant have static attachment points on both sides the axis of rotation, Unless I misunderstand what a ratchet angle gauge is, using a gyro for this is like measuring the difference in gravity or air pressure between someone's head and toes to figure out how tall they are. \$\endgroup\$ – DKNguyen Nov 9 '19 at 20:56
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    \$\begingroup\$ the commercial units probably use something like a code wheel, or maybe a circular position sensor that is similar to a digital micrometer position sensor ... anything that can measure angular displacement ... it probably would not have to be any more accurate than within 1/2 a degree \$\endgroup\$ – jsotola Nov 9 '19 at 21:20
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    \$\begingroup\$ @JRE: the new cool way to tighten bolts (for at least a decade now) is to tighten to a torque, and then a certain number of degrees past that. I think it's called "torque to yield", putting the bolt right at the point where it's about to elongate. It is done with a gyro; you need to use a good one, and you need to zero the gyro right before you tighten the bolt. \$\endgroup\$ – TimWescott Nov 10 '19 at 0:54
  • \$\begingroup\$ @TimWescott Doesn't that require specialized "torque to yield" bolts, as well? I think it's a great idea. And it's been used for cylinder head bolts, memory serving. The designer gets more design flexibility, cost reduction (fewer bolts for example), and more specifications to those maintaining engines. But it's specialized, isn't it? Works well when specified in the design? But not necessarily anywhere else? Mostly I'm curious. (I know Wescott auto in Damascus probably dealt with this back in the day.) \$\endgroup\$ – jonk Nov 10 '19 at 4:02

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