The torque's non existing influence on cutting speed.

[timberwolf]

The mater of if the calculator is built into the dyno or not is trivial.

An engine puts out Torque at RPM, the rest is all how we try to explain it as HP.

 

[ShoerFast]

The mater of if the calculator is built into the dyno or not is trivial.

An engine puts out Torque at RPM, the rest is all how we try to explain it as HP.

YES!
And just an over simple term, it is called work.

 

[timberwolf]

For saws I propose we no longer use horse power for rating saws, we should switch to BEAVER POWER. Have you ever seen a horse cut a tree?

Equivilent number of trees per hour for a given number of beavers.

http://www.paleocurrents.com/img/2003_03_09nc/HTML/img_7788_std.jpg

 

[romeo]

Torque is as important as wide open hp. Compare an 090 to an MS660 (both stock). The 090 winds out at 8500 rpm out of the wood where the 660's 12,500. Run a 8 pin on both saws (same bar and chain) and stick them in a 30" doug fir. There is a lot to be said for torque keeping up rpm's, the 090 will keep running its 8500 rpm right through the center of that log (standing on it) where the 660 will drop off considerably, the 090 will win this race considerably. If your cutting sticks the 660 will shine. I know there not equal saws cc's wise, but I have seen this race quite a few time's and it is a good comparison of torque vs hp.
In racing, your build your saws to compete in a size class and a certain type of wood. Ideally, I would love to have specialized saws for each race and event I attend each year, I went to a show in Arizona where the 5ci class was a 12" ponderosa, the next show in New Mexico was 20" ponderosa for 5ci. This is where it would be nice to have a saw that runs a little more "touquey". At the Arizona show I beat a hotroded Promac 81 by 2 seconds with a 7900, when we raced at the next show in a 20" log the old mac killed me.

When you get into the bike saws, ITS ALL TORQUE BABY...................

 

[romeo]

For saws I propose we no longer use horse power for rating saws, we should switch to BEAVER POWER. Have you ever seen a horse cut a tree?

Equivilent number of trees per hour for a given number of beavers.

http://www.paleocurrents.com/img/2003_03_09nc/HTML/img_7788_std.jpg

I'm working on a 120bp bikesaw right now. HAHHAAHHAHAAHAAA...

 

[ShoerFast]

For saws I propose we no longer use horse power for rating saws, we should switch to BEAVER POWER. Have you ever seen a horse cut a tree?

Equivilent number of trees per hour for a given number of beavers.

http://www.paleocurrents.com/img/2003_03_09nc/HTML/img_7788_std.jpg

Yes!

And keep the term Horse Power were it belongs.

 

[Crofter]

Kevin, it looks like that might be a "cutting horse"?

 

[Woodie]

For saws I propose we no longer use horse power for rating saws, we should switch to BEAVER POWER.

Not so fast there, Timber...we talkin' about SAE or DIN beavers? :hmm3grin2orange:

Plus it's just a matter of time before one of the manufacturers figures out if they measure from the tooth (TBP), instead of at the jaw (JBP), they can make their numbers look better...

 

[ShoerFast]

Not so fast there, Timber...we talkin' about SAE or DIN beavers? :hmm3grin2orange:

Plus it's just a matter of time before one of the manufacturers figures out if they measure from the tooth (TBP), instead of at the jaw (JBP), they can make their numbers look better...

It might have been done already!

http://www.beaverpower.co.uk/index.html

 

[Beweller]

Peter is correct. Power is torque times speed. Power is the rate of doing work.

The more powerful saw can drive the chain faster at a given load (torque), or it can drive a higher load at the same speed. Either way the more powerful saw will cut faster. The greater power can be matched to the job by the "gear ratio" (number of sproket teeth), the pitch of the chain or the depth of the cut.

 

[Woodie]

Peter is correct. Power is torque times speed. Power is the rate of doing work.

The more powerful saw can drive the chain faster at a given load (torque), or it can drive a higher load at the same speed. Either way the more powerful saw will cut faster. The greater power can be matched to the job by the "gear ratio" (number of sproket teeth), the pitch of the chain or the depth of the cut.

Nope. Too many other factors left out. (Keynesian!) You're taking the perfect world of theory and applying it to the imperfect world of saws and their operators. IN THEORY, if said saw was cutting wood which never varied in width, hardness, moisture content (I can go on), you would be correct. But does your wood have knots in it? Is it round? Does the grain vary in ANY way throughout the cut? Is it all heartwood, or is it surrounded by sapwood?

You are talking in peak numbers only. But I can't operate a saw at exactly its peak power output for every single moment I have my finger on the trigger, and neither can you, because you will encounter all of the above conditions and your chainspeed will vary. And with that variation in chainspeed comes a movement along the machines' respective torque curves.

So if your 5.4 hp saw has an incredibly narrow range in which it makes that 5.4 hp, but my 5.3 hp saw has an incredibly wide range in which it makes that power, then the instant you hit a knot, I will own you like a slave.

It's the difference in theory and the application of theory. I can't cut through a log with an equation...I'm gonna need a saw. And that saw's gonna have a torque curve, and that's what's gonna dictate the speed at which it cuts.

 

[Freakingstang]

I can't cut through a log with an equation...I'm gonna need a saw. And that saw's gonna have a torque curve, and that's what's gonna dictate the speed at which it cuts.

WoW, you nailed it!!!! :rockn:

 

[Canyon Angler]

And just an over simple term, it is called work.

Not to pick nits, but power is work divided by TIME.

torque and work and power are three completely different kinds of units.

one horsePOWER is the ability put out work at the rate needed to lift 33,000 pounds one foot vertically IN ONE MINUTE.

with the proper gearbox, and given enough time, a 2-ounce albino mouse could lift 33,000 pounds one foot vertically. but it couldn't be considered a one-horsepower mouse unless it could do that amount of work within one minute.

 

[Wes]

"Power is the physical unit that performs the work."

No.No.Not.A'int.Isn't.No.No.No.

Power, as has been described, is the amount of work done in a given time. I assure you, torque is cutting the wood.

 

[Lakeside53]

I'm only going to read this thread when you guys all agree... Someome PM me when it happens...

 

[Beweller]

Wood newbie: So what happens when you hit the knot? Why not say your saw can cut a 6 inch log faster than "mine" can cut a 24 inch log?

If torque is constant, power increases linearly with speed. No real IC engine has a flat torque curve near maximum output. The reason the output reaches a maximum is that the torque is falling faster than the speed is increasing. Crankcase scavenged 2 stroke engines tend to have a quite rapidly falling torque.

ShoerFast and Wes: I said power is the RATE of doing work.

Peter is right.

 

[SRT-Tech]

my head hurts. somebody post sumtin about how a sharp chain on a lil chainsaw will outperform a dull chain on a big saw... opcorn:

 

[amdburner]

Come to think of it I did run into an issue with a rocked out chain on a Husky 394XP. My 455 Rancher kicked butt while the 394XP smoked its way through the cut.

This Buds for you SRT-Tech!!!:jester:

 

[SRT-Tech]

how much TORQUE is required to open a cold BUDwieser?

 

[amdburner]

Lots!!! I notice it works better with a long bottle opener as opposed to a short one.