Vibration analysis...

[georgi UK]

Originally Posted by zurgxd

I replaced a few suspected parts and seems like I actually got rid of some vibes. This is at 1750 rpm now:
Attachment 629520

That large peak is still there though and I guess bumping up the hs would make it go over 3. I'm still curious about what the cause of this peak could be. Log or not doesn't matter as the peak stays the same.

Well, I'll just keep flying and hope it doesn't explode in mid air.

=] you miss the point, the peak isn't simply a peak by any means. No log, no support.....

[A VIKING]

zurgxd

The vibe you are fixated on is not bad, go fly, it will not be harmful.

All of us here can show you a truly bad vibe.
A vibe score of .3 is fantastic.

I have had vibe spikes as high as 30 and had to battle them down to 2 or 3 which comparing to what they were was very satisfying.

You don't have any issues that need attention, go fly and enjoy the ship.

...or as georgi says post the entire log not just a screen shot, we may be able to see something else, but if that is a short duration intermittent spike that could be tagged to a flight maneuver...its nothing at all...go fly.

[Luvmyhelis]

A temp vibe of 3?

That is wonderful!

Go fly bro.

[zurgxd]

Originally Posted by A VIKING

but if that is a short duration intermittent spike that could be tagged to a flight maneuver...its nothing at all...go fly.

Originally Posted by Luvmyhelis

A temp vibe of 3?

It's not short or temp, its there all the time, from start to landing. Magnitude changes with headspeed only.

That's why I said that the log wont help as it looks the same over the whole flight

Just as a clarification. Won't bother with it if you say that it is fine.

[A VIKING]

zurgxd,

Do you fly that "L" model in your avatar?
As a full scale mechanic I do maintenance on that ship.
As your mechanic, I am saying go fly your Align, the vibe you see in the log is not harmful or a problem for you.
I could take you out in that "L" model and by knocking it out of track or balance show you and let you feel what a bad vibe feels like, then correct the vibe brining it down to the level in scale that you have on your Align and you could feel then that its not that bad.

As your mechanic on the Align I would tell you to go out and do one flight in stable hover, no pitch pumps or screwing around and fly in that hover for one minute at "normal" then go to IU1 for a minute then IU2 for a minute, then post that entire log here for us to look at.
Then we can put this to bed for you.
Have fun!

[Luvmyhelis]

Ever since my earlier super anal days when getting crazy low vibe levels was so important. Since then, I have flown quite a few helis at times with vibes higher than 3 without any problems. But, they still nagged me until I addressed them later? But they weren't unsafe by any means.

[zurgxd]

Originally Posted by A VIKING

Do you fly that "L" model in your avatar?
(...)
I could take you out in that "L" model and by knocking it out of track or balance show you and let you feel what a bad vibe feels like

Only as a passenger and it is vibrating enough as it is.

Originally Posted by A VIKING

As your mechanic on the Align I would tell you to go out and do one flight in stable hover, no pitch pumps or screwing around and fly in that hover for one minute at "normal" then go to IU1 for a minute then IU2 for a minute, then post that entire log here for us to look at.

That is almost exactly what I did, so, ok, here's that log. It looks kind of the same all over anyway. First part is 1550rpm and second 1750rpm.

[CZorzella]

Originally Posted by zurgxd

ok, here's that log. It looks kind of the same all over anyway. First part is 1550rpm and second 1750rpm.

The vibes are all under 3, which are excellent! What are you trying to accomplish here?

Carlos

[A VIKING]

Originally Posted by zurgxd

Only as a passenger and it is vibrating enough as it is.

Looks like we have another project to balance and track.

[/QUOTE]
That is almost exactly what I did, so, ok, here's that log. It looks kind of the same all over anyway. First part is 1550rpm and second 1750rpm.[/QUOTE]

Looking good.
Is that spike at 17,000 a motor frequency?
Go fly it.

[georgi UK]

Originally Posted by Luvmyhelis

Ever since my earlier super anal days when getting crazy low vibe levels was so important. Since then, I have flown quite a few helis at times with vibes higher than 3 without any problems. But, they still nagged me until I addressed them later? But they weren't unsafe by any means.

=] yes but you mastered it Randy! reading a 2D log and converting it to 3D in your mind!!

[georgi UK]

=] Thanks for the log! Initially you were chasing a TT issue (bearings) and are now left with a motor vibe, but as said it"s not destructive. although as you have stated it increases with higher RPM's, my approach would be, in this order =

1, check the pinion is secure and it's condition
2, check the maingear mesh and it's condition
3, check for any up/down float in the motor shaft
4, check the motor plate isn't bent (I partly suspect?)
5, if this is a stock esc, are the beeps the same as mine?

Copy of Brazillian GPS unit in the UK! (0 min 41 sec)

[zurgxd]

Originally Posted by georgi UK

=] Thanks for the log! Initially you were chasing a TT issue (bearings) and are now left with a motor vibe, but as said it's not destructive.

I'm not sure if there ever were any TT issues with this one, there were and still are issues with the old one though, which is why I abandoned it.

Ok, so it's the motor? I didn't expect that. It's only a few months old. Had to replace the stock motor as I destroyed it (by hand...). So I'm now using this one, because it was cheap and available.

Originally Posted by georgi UK

although as you have stated it increases with higher RPM's, my approach would be, in this order =

1, check the pinion is secure and it's condition
2, check the maingear mesh and it's condition
3, check for any up/down float in the motor shaft
4, check the motor plate isn't bent (I partly suspect?)

I did a quick check without taking everything apart:

1. pinion seems secure and looks OK to me?


2. can't really see the mesh, but shouldn't it be OK when it is non-adjustable?

main gear also looks ok, to me.


3. there are no play in the motor whatsoever.

4. cant see anything unusual, but it's really hard to see the plate at all. I will have to take everything apart to investigate further.

Maybe it's just a cheap unbalanced motor?
Already planning to replace it at some point, perhaps with the stock model.

Originally Posted by georgi UK

5, if this is a stock esc, are the beeps the same as mine?
Copy of Brazillian GPS unit in the UK! - YouTube

It's a stock castle 80a esc, sounds nothing like that at all.

[georgi UK]

=] ok, I was referring to the screen-grabs which are showing TT issues... can you check that pinion is the correct mod for the main gear?

Fixed mesh is a crap idea, my motor vibes were high until I fitted the KDE adjustable mounting, uses a larger counter-bearing also...

Is that link really the motor you are using?

We will need a CC ESC user for you to compare settings with, PWM timing etc...

[rickn816]

I've been fighting a similar problem for a month.

The gear mesh was too tight.

Doh

Rick

[zurgxd]

Originally Posted by georgi UK

can you check that pinion is the correct mod for the main gear?

It has to be correct as they are sold together.

Originally Posted by georgi UK

Is that link really the motor you are using?

Yes, it is.

Actually, I think that there were less vibrations when I ran the stock motor with 12T pinion. Compared to this, with 13T.

Originally Posted by georgi UK

We will need a CC ESC user for you to compare settings with, PWM timing etc...

I can hook it up to the pc and post my settings here if needed.

Originally Posted by georgi UK

Fixed mesh is a crap idea, my motor vibes were high until I fitted the KDE adjustable mounting, uses a larger counter-bearing also...

Originally Posted by rickn816

The gear mesh was too tight.

So, perhaps something like this could help?
http://www.fast-lad.co.uk/store/lynx...5-p-19601.html

I'm not sure if it is worth it putting so much money into a cheap/crappy machine like this.

[georgi UK]

=] I'm not clear on what heli you have, is it a clone 600? Yes that's the adjustable mount I spoke of, my heli was a new kit, cnc gears etc and I wasn't going to file the new frames for better mesh! I sold the new stock items on eBay for a good price, so only get one if you think you need it, can't tell from here!

[zurgxd]

Originally Posted by georgi UK

=] I'm not clear on what heli you have, is it a clone 600?

Not sure, some kind of align 600E. Fits the specs of the efl pro, may very well be one.



Ordered the LX0225 anyway. Now it is out of stock

[georgi UK]

=] look for a part # on the frames, tail servo aperture at the bottom of the insert...

[Luvmyhelis]

Here is another option

http://www.kdedirect.com/collections...cts/at600p-umm

The very first thing I eliminated from all my Align helis, is the fixed motor plate! There are a number of companies making upgraded parts for these, including OMG also, which I have on a couple of modded Esp's. Before this, I had some custom machined for me.

[zurgxd]

Ok, as soon as I removed the motor a giant play showed up, about 0.3mm axial. I guess the mounts pressed everything together, making me unable to notice it before.

I've already spent ridiculous amounts of money on this machine so unless I can find a used motor very cheap I'm done with this.

Originally Posted by georgi UK

=] look for a part # on the frames, tail servo aperture at the bottom of the insert...

I can only see something that looks like a serial number, B123014514.

Originally Posted by Luvmyhelis

Here is another option

http://www.kdedirect.com/collections...cts/at600p-umm

Buying from the US is just too expensive.

Originally Posted by Luvmyhelis

The very first thing I eliminated from all my Align helis, is the fixed motor plate! There are a number of companies making upgraded parts for these, including OMG also, which I have on a couple of modded Esp's. Before this, I had some custom machined for me.

I thought a fixed mount was a really good thing. I rather have it fixed at a known good position compared to having the main gear explode in mid air, due to me setting the mesh wrong..

Also, I don't even understand how this adjustable mount is supposed to lock. It keeps sliding even when fastened.