Chain Issues.. anyone??

[jokers]

Originally posted by RockyJSquirrel
Keep in mind that the .325 chain will have a slower speed than 3/8" chain if compared at the identical engine RPM.

Hi Brian,

You`re right that the .325 would have a lower sfpm speed than 3/8s with both being driven by 7 tooth sprockets but obviously both chains are going to spin 7 DLs for each revolution of the crankshaft. Given the closer spacing of the .325, the number of cuts taken per minute might be about even. I don`t feel like doing the math, do you? Maybe Glen will drop in and take care of it for us.

I gotta run, intern nipping at my heels. I didn`t think he`d find me here.

Russ

 

[glens]

Russ beat me to it, Brian.&nbsp; The linear speed of the chain/sprocket setups would be:<ul><li>.325&times;7:&nbsp; 4.55 in/rev (43.09 mph @ 10,000 rpm)</li><li>.325&times;8:&nbsp; 5.20 in/rev (49.24 mph @ 10,000 rpm)</li><li>³/₈&times;7:&nbsp; &nbsp; &nbsp;5.25 in/rev (49.72 mph @ 10,000 rpm)</li></ul>While the latter two have comparable linear chain speeds, the first and third (should) have comparable cut speeds since they share the same number of cutters/second at any given engine speed.&nbsp; Clearly, the middle setup would move the most cutters through the wood at any given engine speed.

With 7-pin drivers, "lesser" saws can pull the same number of cutters per time through a piece of wood using .325 chain as compared to their ³/₈ (&times;7) brethren.&nbsp; Because the chain pitch diameter (the size of the circle through which the rivets travel) at the driver is smaller, however, their crankshafts have better leverage against any single cutter when so equipped.&nbsp; It might be that the greater number of working edges in a cut negates that advantage somewhat.

I have yet to make a friend so as to be able to perform a test.&nbsp; I'm all set up for it, though.&nbsp; I've got brand new 33RS and 26RS chains, ³/₈&times;7 and .325&times;8 rims, and comparable bars to make the comparison using my 036.&nbsp; I don't have a motion camera so I can't masturtime the setups.

Glen

 

[blackoak]

Originally posted by Typhoon
Ok spencerhenry, I appreciate your advice, but the reason that I said that filing is not the problem, is so that posts about filing would stop! I am intelligent enough to realize that no matter how good you are at something, there is always room to improve. We all know this.. So is my technique perfect??? Nope. However, common sense comes into play here.. when my chain starts to dull, and throw smaller chips, I touch it up. After I do, the chain cuts like a brand new one out of the box, and cuts to my expectations. My expectations are that it cuts at least as good as a new one, cuts straight, throws big chips, and pulls through the cut nice and strong. I realize that my chain may not be RAZOR sharp, but believe me, I can tell by the way it performs, that a dull chain is not the problem. So please no more posts about dull chain. On to other possible reasons. Don't mean for this post to sound snappy or anything, but you said it yourself, kinda beating a dead horse.
Peace..

Sounds to me like you have a dull chain. Do you know how to sharpen one?

 

[Fish]

I haven't taken the time to read all of this, but has anyone
suggested that his sprocket might need replaced?
Just curious.

 

[Grande Dog]

Woodturner,
Our Woodsman Pro chain is a private label name for chain that is manufactured by Carlton.

Grande Dog
Master Mechanic
Discount Arborist Equipment and Tree Care Supplies

 

[Jacob J.]

Dog- what about your "Woodsman Pro X" chain? It says in your catalog that it is manufactured with Oregon LG cutters on a different chassis. thanks.

 

[Grande Dog]

Since Oregon bought out Windsor, this is the first of many cross breeds coming out of the new kennel. Not to long ago we had some Oregon Power Match bars with 5 rivet Windsor tips on them.

Grande Dog
Master Mechanic
Discount Arborist Equipment and Tree Care Supplies

 

[Lawn Masters]

Grande Dog, werent those 5 rivet bars the windsor bars that were mislabeled?
I seem to recall Baileys had them once, 28" stihl mount .063 ga if I remember correctly. Those were in the 03 christmas sale catalog.

 

[Grande Dog]

Those bars were a pre merger deal, but they had something to do with territorial sales. That might have been the tip of the iceberg. ( if you can't beat'em, buy'em)

Grande Dog
Master Mechanic
Discount Arborist Equipment and Tree Care Supplies

 

[Jacob J.]

So that Woodsman Pro "X" chain is a blend of Oregon and Windsor components?

 

[bwalker]

JJ, I believe the chain in question has a windsor chassis and a oregon lg cutter. Windsor 3/8 is the same thing.
fwiw i have used the stuff and liked it.

 

[Grande Dog]

You're right, it's a Windsor chassis with a Oregon cutter.

Grande Dog
Master Mechanic
Discount Arborist Equipment and Tree Care Supplies

 

[Oregon_Rob]

Hmmmm

This goes right to my waffling about weather it makes sense to go to a .325 setup for milling. Narrow kerf, must be good, but more cutters engaged at one time might not be good.
How about the .325 chain, is it available in skip version for full and or semi-chisel?

Originally posted by glens
Russ beat me to it, Brian.&nbsp; The linear speed of the chain/sprocket setups would be:<ul><li>.325&times;7:&nbsp; 4.55 in/rev (43.09 mph @ 10,000 rpm)</li><li>.325&times;8:&nbsp; 5.20 in/rev (49.24 mph @ 10,000 rpm)</li><li>³/₈&times;7:&nbsp; &nbsp; &nbsp;5.25 in/rev (49.72 mph @ 10,000 rpm)</li></ul>While the latter two have comparable linear chain speeds, the first and third (should) have comparable cut speeds since they share the same number of cutters/second at any given engine speed.&nbsp; Clearly, the middle setup would move the most cutters through the wood at any given engine speed.

With 7-pin drivers, "lesser" saws can pull the same number of cutters per time through a piece of wood using .325 chain as compared to their ³/₈ (&times;7) brethren.&nbsp; Because the chain pitch diameter (the size of the circle through which the rivets travel) at the driver is smaller, however, their crankshafts have better leverage against any single cutter when so equipped.&nbsp; It might be that the greater number of working edges in a cut negates that advantage somewhat.

I have yet to make a friend so as to be able to perform a test.&nbsp; I'm all set up for it, though.&nbsp; I've got brand new 33RS and 26RS chains, ³/₈&times;7 and .325&times;8 rims, and comparable bars to make the comparison using my 036.&nbsp; I don't have a motion camera so I can't masturtime the setups.

Glen

 

[Grande Dog]

We sell a full skip round ground chisel made by Carlton in .325 X .050. It sells for $.18 per drive link in loop form.

Grande Dog
Master Mechanic
Discount Arborist Equipment and Tree Care Supplies