The All Aussie Hort Wanker Thread

[Brewz]

Yeah, that's an idea. The saw likes to rev and going to a 7-pin would really have it screaming, but if I dropped the rakers I may be able to cut as fast or faster with less chain wear.

I wouldn't drop the rakers.
In really hard wood, slow and steady will win the race

If you drop the rakers, you will likely kill your clutch/sprocket trying to dig the teeth in deeper.

 

[Gypo Logger]

Gypo ya dirty dog! I knew you'd come over here to start trouble. I saw the other day that you were attempting to stalk me (bait me?) over on AS. I cancelled my sponsorship there. Wasn't worth the effort and I had to filter through far too many new dickhead know it alls.
Glad to be here and see a few familiar faces! Won't poke my nose in too often though as I hate chainsaws. They frighten me.

Hi Matt, yes I was stalking you! Lol
I want to see if Ben got the saw and was pleased or not. I sat on pins and needles all these months.

 

[Gypo Logger]

And pieced it up with a new 661

Can I ask how much a 661 is in OZ in US funds?

 

[Brewz]

$2349 aud
$1645 usd

What are they in the states?

 

[mdavlee]

$2349 aud
$1645 usd

What are they in the states?

My dealer said $1135. Seen them in some states for $1k

 

[Brewz]

Heed this American brothers.

NEVER complain about saw prices to an Australian!

For $1k usd, I could buy one, have it master minded and posted here cheaper than I could get it here from a shop

 

[treesmith]

Heed this American brothers.

NEVER complain about saw prices to an Australian!

For $1k usd, I could buy one, have it master minded and posted here cheaper than I could get it here from a shop

I did from mastermind, Randy sent a new ported 661 here for around $2K AU

 

[Brewz]

Mmmmmm domething to think about!

I love my old 066 but a nice new one would be good.
I'm still not sold on the auto tune carbs though. It just sounds like something expensive to go wrong.

Happy to be proven wrong though..... Other opinions??????

 

[Brewz]

$1135 USD is $1620 AUD

That's $729 AUD more if purchased here

 

[weedkilla]

Over $1k aud and you get stung at customs. It is possible to import a second hand chainsaw, or a box of parts that has a lower value.....

 

[treesmith]

The exchange rate sucks ass at the moment, my first 261 cost about $600au when I bought it over a year ago

Sent from my SM-G900I using Tapatalk

 

[Brewz]

Well once a saw has been ported it would need a test cut run correct?

2nd hand!

It is predicted that the Aussie dollar will fall to 60c by the end of this year

 

[Brewz]

Terry
A good vid showing that slower is faster

 

[Terry Syd]

Interesting video, I expect that the speed difference has something to do with the chain construction. Can anyone explain why the 8-pin ran slower?

If you take the video to it's logical conclusion of slower is faster, then a 6-pin should cut even faster - and I doubt that would be the case. There is also heaps of guys that are building their saws for a faster cutting speed and some of those saws are turning more than 14% (difference with an 8-pin) faster, yet they do cut faster rather than slower. Heck, chainsaw racers are running a lot higher gearing than a 8-pin.

Going back to chain construction, it may be a relationship of the optimum bar loading to the cutting angle (raker depth), but I don't know. Anybody understand the physics of why the 7-pin cut faster?

 

[weedkilla]

Interesting video, I expect that the speed difference has something to do with the chain construction. Can anyone explain why the 8-pin ran slower?

If you take the video to it's logical conclusion of slower is faster, then a 6-pin should cut even faster - and I doubt that would be the case. There is also heaps of guys that are building their saws for a faster cutting speed and some of those saws are turning more than 14% (difference with an 8-pin) faster, yet they do cut faster rather than slower. Heck, chainsaw racers are running a lot higher gearing than a 8-pin.

Going back to chain construction, it may be a relationship of the optimum bar loading to the cutting angle (raker depth), but I don't know. Anybody understand the physics of why the 7-pin cut faster?

Can't say that I understand the physics, and it would take a whole lot of high speed video before I did, but the simple answer is there is a correct match for each saw, chain and wood. In the real world this means that you are always compromising, but that's life.
All I do know is higher chain speed dulls chains faster. In crappy timber that can be one cut. Actual cut speed is irrelevant when semi chisel chain is getting dull that fast.

If I was to guess at the physics I'd be looking at the chains ability to clear chips.

 

[Terry Syd]

the simple answer is there is a correct match for each saw, chain and wood. In the real world this means that you are always compromising

You comment brought me back to something I ran into with the shape of the raker. A sloping angle on the raker can allow the raker to sink deeper into the wood, thus the raker can be tuned to sink deeper in soft wood and less in hard wood. In other words, it can help to eliminate some of the compromising.

I'm tending towards bar loading affecting the bite the chain takes.

Has anyone ever done testing with 7 and 8 pins where the raker depth has been changed during the tests?

EDIT: Yeah, I agree a higher chain speed when it hits some grit in the bark or grit from termites can blast the chrome right off the cutter.

 

[weedkilla]

You comment brought me back to something I ran into with the shape of the raker. A sloping angle on the raker can allow the raker to sink deeper into the wood, thus the raker can be tuned to sink deeper in soft wood and less in hard wood. In other words, it can help to eliminate some of the compromising.

I'm tending towards bar loading affecting the bite the chain takes.

Has anyone ever done testing with 7 and 8 pins where the raker depth has been changed during the tests?

I've tried, I struggled with consistency and decided that outside of a racing environment "close enough is good enough". Half the time I'm cutting when I can't spray weeds, and sideways rain isn't the best situation to worry about minutia.

 

[Brewz]

here os how I see it.
To pull the saw tooth through the wood, you will need a certain amount of power.

The faster you try and drag that chain the more power you will need because at the higher speed, the timber is now offering higher resistive force.

This higher resistive force will slow the saw engine speed more because it's only the no load chain speed you have increased. That leaves you running the saw with reduced power at lower revs and your chain is still spinning faster, increasing load at the lower revs which ends in a slower cut time.

Think about a car.
If the car has unlimited gearing, your limiting factor for top speed will be power V's air resistance.
To make it go faster, you need to reduce the air resistance or increase the power.

I know for a fact that to get a small speed gain you need a comparitivly large boost in power with a car.

Back to the saw chain, I would assume that the force exerted on the saw chain would not be a linier curve as you increase speed, Si if you don't have the power to pull it at the increased loaded speed, your going to cut slower.

 

[Brewz]

I also think there are other factors like when you run a faster chain in hard wood. The tooth will be more inclined to skip over parts during its time in the cut.
The resostive force is greater so it will jitter around more, removing less wood.

In soft wood like pine, this won't be as obvious because the teeth can dig in a bit easier.

That is where tuning the rakers to assist the bite you get in the cut will be helpfull at higher speeds bit in the hard stuff we cut here in Aus, I really believe slower is better.

I remember reading somewhere that going from 7 pin to 8 pin will give a 15% chain speed gain but 15% rebutting in torque.

You need to match your saw, and cut speed to what your cutting

 

[weedkilla]

It really isn't something I think awfully hard about. I just swap a rim and see what happens.
346oe fastest with 3/8lp-7, but 325-7 is close and lasts better.
550 fastest with 325-8 or 3/8-7 (near enough to same chain speed and cut speed)
562 only tried 3/8-7
385 3/8-8 up to 24" bar, 3/8-7 for longer.

None are stock saws, chain sharpness limited by the numpty who sharpens my chains, just talking clean wood cookie cutting, I usually use a lump of olive for testing as its a good middle ground timber and clean, others results may vary.