Here’s a new one

[Number1olddog]

Anyone notice anything out of the ordinary? I pulled up to the house and turned the Jeep off. It was stuck at 10mph on the speedo. Turned it back on and the needle flickered and stayed on 10 mph at a stand still. Turned it back off and now it’s working. Any advice to what problem I may be experiencing?

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[Oscar Indy]

Anyone notice anything out of the ordinary? I pulled up to the house and turned the Jeep off. It was stuck at 10mph on the speedo. Turned it back on and the needle flickered and stayed on 10 mph at a stand still. Turned it back off and now it’s working. Any advice to what problem I may be experiencing?

Computers glitch. If it happens frequently be concerned. One off. Don't stress

 

[MarineHawk]

Anyone notice anything out of the ordinary? I pulled up to the house and turned the Jeep off. It was stuck at 10mph on the speedo. Turned it back on and the needle flickered and stayed on 10 mph at a stand still. Turned it back off and now it’s working. Any advice to what problem I may be experiencing?

Maybe you actually were moving at 10 mph, but the ground you were on also was moving at 10 mph in the same direction?

 

[Number1olddog]

Ya that makes sense

 

[ShadowsPapa]

Maybe you actually were moving at 10 mph, but the ground you were on also was moving at 10 mph in the same direction?

The speed of light is the same no matter how fast you are traveling or what direction......... perhaps he actually hit warp 10?

 

[Hootbro]

electrical hysteresis

 

[Oscar Indy]

electrical hysteresis

Sounds fatal

 

[MarineHawk]

The speed of light is the same no matter how fast you are traveling or what direction ...

True, except that it does slow down when passing through matter--i.e., when not in a vacuum: https://en.wikipedia.org/wiki/Slow_light
And it apparently stops when it reaches the event horizon of a black hole.

 

[Hootbro]

Sounds fatal

Happens when electric motors have induced polarity shifting magnetism from sudden start stop of the circuit and causes the armature shaft to be in a non resting physical state. In the case of the speedo, the needle drives on a DC electric stepper motor.

 

[ShadowsPapa]

Happens when electric motors have induced polarity shifting magnetism from sudden start stop of the circuit and causes the armature shaft to be in a non resting physical state. In the case of the speedo, the needle drives on a DC electric stepper motor.

The magnetization lags behind the field - that sort of principal?

 

[Hootbro]

The magnetization lags behind the field - that sort of principal?

Sort of. Been awhile and would have to dust of some theory books but from my past experience working on older aircraft analog instrument gauges that have similar driver motors for the needles, you have ferromagnetic materials like the permanent magnetization the armature rotates in back and forth when polarity switched. The problem is that some materials in a gauge setup are ferroelectric materials that only take a temp magnetic charge if a magnetic field switching event takes place but will soon dissipate and become non magnetic either through another magnetic switching event.

Most gauges are usually built and shielded to not have this issue, but certain tolerance stacking events and outside atmospheric conditions can exacerbate this.

The other thing if not electrical hysteresis is just physical assembly tolerance issue of the needle sticking on the panel hole through.

 

[ShadowsPapa]

True, except that it does slow down when passing through matter--i.e., when not in a vacuum: https://en.wikipedia.org/wiki/Slow_light
And it apparently stops when it reaches the event horizon of a black hole.

Ah, collision avoidance.

I've watched some videos where they fired lasers to measure the effect - the future is amazing.

 

[ShadowsPapa]

Sort of. Been awhile and would have to dust of some theory books but from my past experience working on older aircraft analog instrument gauges that have similar driver motors for the needles, you have ferromagnetic materials like the permanent magnetization the armature rotates in back and forth when polarity switched. The problem is that some materials in a gauge setup are ferroelectric materials that only take a temp magnetic charge if a magnetic field switching event takes place but will soon dissipate and become non magnetic either through another magnetic switching event.

Most gauges are usually built and shielded to not have this issue, but certain tolerance stacking events and outside atmospheric conditions can exacerbate this.

The other thing if not electrical hysteresis is just physical assembly tolerance issue of the needle sticking on the panel hole through.

I had a feeling you were brilliant beyond what we see.

 

[JP1]

you crossed the beams...
you aren't supposed to cross the beams...
that's bad...

 

[ShadowsPapa]

you crossed the beams...
you aren't supposed to cross the beams...
that's bad...

I think we've just been slimed.

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