I see you have a channel of your own...will squeeze in a bit of time and check it out:)

+Dave Sage - Should be able to apply this to your work. Temporary correction weight to confirm before permanent correction is important. Thanks for dropping by, Dave.

all good points:)

+Dave Sage - Get the photocell adjusted right, provide 5v and get signal from x-axis on ADXL335, interpret waveform as shown in this video, use protractor I provide in link to index rotor, confirm with a temporary correction weight before doing anything permanent and you'll succeed. It's a dynamic balancing procedure using an oscilloscope not found anywhere else on the internet!

Dave Sage - the best way I can explain it is the the ADXL335 has "freedom of motion" while the piezo does not. So, the X-axis is allowed to move from one direction to the opposite direction, unrestricted producing a sine like waveform. The piezo hits a wall...rebounds...waveform becoming complicated, unusable.

+Bill Rimmer - yes, both the stethoscope and the accelerometer are very sensitive and have fast responses. Less than $3 each which makes it all the more impressive! Am 10 hrs north of TO...Kapuskasing.

cool! hope it does help and I'm here if any questions Bruno... Denis

Add more weight where, Arvindh? Are you trying to balance a pulley with an accelerometer as shown in this video? The size of the motor does not matter. The principle remains the same. I would run motor with no belt and no pulley and confirm it does not shake. Then, I would run motor with pulley and no belt and see if it shakes. That would confirm it's the pulley, right? Then, I would run it with belt.

don't know the brand and it's in a bad spot in a very cold garage at the moment so I can't get to it right now... as stated in video, it is 1.5HP ... 3450 RPM ... sealed motor so dust can not go into windings as the original motor ... could have been wired 240v or 120v ... I chose 120v for convenience... they don't give good quality motors like this away!

It's ADXL335 ...the analog accelerometer Not to be confused with the ADXL345, the digital output version They're found on Aliexpress...about $3 Perhaps on eBAY as well, Juan...not sure

Thanks you Denis. I'll check it out. :)

+Martinloren R&D - by the time I'm done, the world will be a much smoother place😎 As always thanks for watching, Martin!

@@theGADGETSplaylist 😁😁😁

Dunno if anyone gives a damn but if you're stoned like me during the covid times you can watch pretty much all of the latest movies and series on InstaFlixxer. I've been streaming with my girlfriend for the last weeks :)

@Merrick Benton Yup, I've been watching on instaflixxer for since december myself :D

+Dave Sage - man, there's lots to cover here! Trying to compensate the recoil of a power stroke through balancing, especially on unpredictable hit and miss engine isn't likely to succeed. My opinion, and I very well could be wrong (it happens)... My view is that we have to distinguish between unbalance and power stroke "recoil". Here's where your newly built stethoscope in FFT mode can come in. Do not take reading in same plane as engine recoil (too violent). I suggest perpendicular to the base. You should see a fairly stable Hz that corresponds to the engine RPM. That's your unbalance, not that the instrument is capable of telling you at what angle to place a correction weight but is capable of telling you that it is occurring at 1x RPM. Then, there will be many other frequency peaks on the FFT screen. Most of those will represent irregular power strokes and should be lower Hz than RPM as they occur randomly and less frequently. Concentrate on the VERY low frequencies...RPM equivalent and lower. Higher frequencies will be harmonics, frame resonance, echoes, etc...of no interest to us. Let me know what you see...

I don't imagine there's much that can be done about the "kick" but when it is coasting it does bounce around a bit on the table and that's what I worked on with the previous piezo setup I had. I don't recall where I placed it - probably somehow coupled to the mounting base. I think I did the best I could with what I had. Perhaps a revisit using the new stethescope along with your suggestions will give more meaningful readings. It won't happen any time soon. It's not really bad and most of the problem is the kick. It actually lifts the front of the stand slightly if you don't fasten it down. I compensated a bit by retarding the timing to well past TDC which tamed it down quite a bit. It's a beast. Thanks for your interest.

@@davesage9190 - your model engines are interesting that's for sure. Glad to be of help.

I'm a very frugal guy...you won't see me spend lots of money on pulleys:) as to the lathe, I promised myself I'd not get one in retirement...did enough of that in my machinist working years...and another problem with those is that all of a sudden you have more friends, all wanting shit machined...nope