Automotive Vibration Analyzers - Part 1 of 5

[@billanderson3192]

I still have a lot of respect for the reed tachometer! John, I always love your videos! Thank you!!!

[@WeberAuto]

Thanks Bill!

[@bbstacker70]

Thank you for this video. I watched about 8 really bad videos on this sirometer, and you are the only only to explain what I was to be looking for from the spring when the correct rpm I was looking was reached. Thank you again.

[@johncollins8304]

Thanks for reminder on the Briggs. Haven't used mine for some years (on garden equipment) and thought it was broken/ indeed of maintenance/ oiling. Nope, it was me that was indeed of oiling, so thanks for that!

[@WeberAuto]

Thanks for watching

[@TheJKJunkie]

Just found one of the resonant reed style ones in an abandoned industrial building on our facilities property that was scheduled for demo, glad i scooped it up before it got crushed, the one i found is the same brand as the one you show in the video however the indication is in RPM, it reads up to 75 x 100 rpm

[@WeberAuto]

Very cool find!

[@billanderson3192]

I have the most experience with the Sirometer. However it does require developing a skill. But when you get it, you get it. It's cheap, and very accurate. Once you've dialed in the correct vibration. The wire will appear orbital.

[@daleslover2771]

The German design wire vibration analyzer is worth its weight in gold,, I use my extensively working in a small engine repair,, many time a customer will talk about a high vibration,, it cannot be easily diagnosed because of the moving parts,, I used it Many Times doing tune ups on engines on vehicles,, a little tricky at first,,, playing with them,,, when and where and how too place them,, had a customer one time complain about a vibration at 40 to 45 miles an hour (Truck) then it seemed to smooth it self out,, by process of elimination, attaching a water hose clamp to a Driveline,, rotating it every 1/2 of an inch we discovered she had a bent Driveline,, then she told me she replace her U-joints several times, I told her that was pertinent information that could save me a lot of time.🤤

[@WeberAuto]

Awesome, thank you!

[@rotorblade9508]

the mechanical fourier transform is so cool 😝 I’m trying to do some measurements on a car flywheel and I’ve built a piezoelectric sensor and I wired a tachometer to send bot signals to an portable oscilloscope. The oscilloscope works pretty well with 2 channel input. This one was like $600 but there are even cheaper ones available. Btw it has a FT function but it’s kind of slow. Your mechanial analog one seems to give you pretty crisp readings 👍 even the syometer is ingenious:)

[@darrenherring1227]

You do such a great job sir. So informative. Thanks. Who makes the reed tachometer?

[@AdvTechTS]

Hi John, great stuff! If you have a tire with two high spots at 90 degrees apart, would this cause a second order vibration or two first order vibrations at a different phasing?

[@WeberAuto]

Thank you! It would be a second order tire speed related vibration

[@robertobendezu6230]

Thank you for your instructing video! I really appreciate it!

[@WeberAuto]

Thank you!

[@knighthawk86855]

Thank you very much for this video, very informative.

[@WeberAuto]

Thank you!

[@sjakan123]

Hi Professor Kelly, I try to find the relation in between dBg that are the scale for a Toyota NVH tool, compared to mg that e.g. Pico uses? Are you able to provide any information on that? Thanks in advance! Br. Sjakan

[@WeberAuto]

The dBg is for sound through the microphone attachment. There is no conversion to mg (milli-Force of gravity).

[@sjakan123]

Thanks for your reply, I also never have seen this in reference on Vibration, but if you Google Toyota NVH training, you find a pdf doc. That states this on page 110. Direct link to the pdf is here. www.testroete.com/car/Toyota/mr2%20spyder/References/Technical%20Training/04%20-%20Noise,%20Vibration%20and%20Harness/04.pdf Br. Sjakan

[@WeberAuto]

sjakan123 here is a link to the ISO standard for dBg. It is used to measure sound pressure levels for frequencies lower than 20 Hz. www.iso.org/standard/13813.html

[@sjakan123]

WeberAuto, what I found regarding the statement dBg. The scaling is also available in the Pico tool, when measuring vibration above the Infra Spectrum. Quote: Amplitude - The quantity used to express the level or magnitude of a vibration. When expressed in dBg (Decibels g) it relates closely to what the customer feels. Br.Sjakan

[@sjakan123]

I miss an answer on this statement, Thanks in advance.

[@sinicodaniel]

It's an interesting topic! Thank you teacher!

[@WeberAuto]

Daniel Sinico Thank you!

[@grigorgeorgiev4015]

Extremely helpful, thank you very much!

[@WeberAuto]

Thank you

[@adityasingh-dc9qp]

As always really grt demonstration,.. thank u sir

[@WeberAuto]

aditya singh Thank you!

[@geojor]

thank you for this...

[@PaulCTownsend]

Thanks for the great info.

[@WeberAuto]

Paul C Townsend Thank you!

[@johncollins8304]

The "Briggs" thing is 15:50 mins in.

[@WeberAuto]

Cool tool