346XP @ 15K or 260 @ 14,500K

[drunkenredneck]

stihl 260 w/24" bar and full skip

I'm not sure what you mean I was under the impression that the 026 was running full comp chain not skip chain however I have been wrong before??

 

[SawTroll]

I'm not sure what you mean I was under the impression that the 026 was running full comp chain not skip chain however I have been wrong before??

He (Dean) said full comp in post number one.......

 

[Timberhauler]

Dean is gonna build me a 346 soon.Hopefully it'll be ready in june...I've never actually been excited about getting a new saw,but I can't wait.

 

[Lakeside53]

Playing around with some of my audio software after seeing an ingenius idea (a duh, why didn't I think of that sort of one) proffered by dbabcock in a tach thread. I was shopping for a tach, then he went off and proposed the obvious: audio frequency analysis. It turns out that one of my hobbies is phonography (recording random stuff) and I have a full version of CoolEdit that does frequency analysis. So, playing the audio track from a digital video allows me to measure with what I believe to be reasonable accuracy the frequency of a saw's power pulses and thus RPM (multiply frequency in Hz by 60) of a saw by analyzing the audio waveform.

Stihl Crazy's video showed the first saw (346 EHP) maxing out at 13,200 out of the cut right before wood entry and in the cut, it was turning around 8,700.

The second saw (260 KRS) maxed out before wood entry at around 12,000 and in the cut, ran around 9,660.

So, assuming equal sharpness and similar pressure in the wood (hard to control), the 260 HAD to win because more cuts per second were occuring. The same force into wood is key here.

In both videos, I "looked" at 1 second windows of time over the course of the cut, looking for the approximate steady-state frequency to find the in-the-cut RPMs. The out of the cut RPMs (measured just before wood entry) are almost certainly not the max-RPM of the saws, because the videos weren't taken for tuning purposes, but to record a cutting session. (i.e. Not many people let their saw spool to maximum RPM and wait a second before starting a cut.) The precison of this method is about +/- 150 RPM because of the width of the primary frequency peak in the power spectrum of the audio track. That's plenty good for practical saw tuning in my opinion, but racers would probably be better served by a precision tachometer.

I would be VERY interested in someone posting a video of a few tuning runs and have them post it, withholding what their measured RPMs were. Then, I could analyze the sound and check my technique in a "blind" sort of way and see how they compared to a tachometer's measurement. Anyone up to the challenge?? I'm going to start a new thread with a reference to this post so that a broader audience reads this buried post.

While I used a full-blown audio editing package, I'm convinced that some freeware or very cheap shareware would be out there to allow this type of RPM measurement to be easily performed by anyone with a laptop handy...

great post.. This idea could be very useful at a race... checking on the competing saws...

 

[klickitatsacket]

great post.. This idea could be very useful at a race... checking on the competing saws...

that's just a little devilish.

 

[ShoerFast]

And now a word from our Mod Sponcers.... Do you wanna new saw?

Are you tired of your slow cutting chainsaw?

Do you wish your saw had a little more speed?​

Dose your saw remind you of this?​

http://www.youtube.com/watch?v=zc0VKSU7gQA&NR=1

Do you wanna new saw?

Maybe a modded saw is your answer?​

http://www.youtube.com/watch?v=swr869JWEZA&mode=related&search=

Now back to our regularly scheduled thread....​

 

[Stihl Crazy]

In my video the 346 was set at 14,800 and the 260 was set at 14,500 by my tach.

 

[Stihl Crazy]

sperho, can you tell what this saw is doing? I would like to know the in wood rpm.

 

[16:1mix]

Well I had 2 builds this week that got finnished. The first was a stihl 260 that is built for an Arborist in S. Ca. It is turning 14,500 out of the wood and 11,200 in the wood. The 346 was built for a barber in S. WA and is turning 15,000 out of the wood and 11,800 in the wood. So which do you choose?
opcorn:

Aw heck, I gotta pick ONE.....I wanted one of each!
:rockn:

 

[sperho]

In my video the 346 was set at 14,800 and the 260 was set at 14,500 by my tach.

I don't doubt those settings a bit. I re-watched the Husky video many times and in fact stretched the audio track so I could examine things more closely and my guess as to the disagreement is the same as my first: the throttle was being blipped and there just wasn't enough time to reach 100% rpms before the saw started getting down to business. Given the Labonville result in the other thread, I'm growing a bit more confident in the technique...

 

[sperho]

sperho, can you tell what this saw is doing? I would like to know the in wood rpm.

I measure that saw to be peaking at around 15,500 between cuts and for the 1st and 3rd cuts, it drops to a low of about 10,300. In the 2nd cut, it only dropped down to about 11,400. Did you have a small tach mounted during those cuts?

 

[Erick]

Are you tired of your slow cutting chainsaw?

Do you wish your saw had a little more speed?​

Dose your saw remind you of this?​

http://www.youtube.com/watch?v=zc0VKSU7gQA&NR=1

Do you wanna new saw?

Maybe a modded saw is your answer?​

http://www.youtube.com/watch?v=swr869JWEZA&mode=related&search=

Now back to our regularly scheduled thread....​

Man that first video is just painful to watch. :bang:

 

[Engineeringnerd]

I know we're quick to point out when a chain is on backwards. I'm convinced that in the first video he didn't even have a chain, just a sharp bar!