Author Topic: Guide Bar & Saw Chain info explained  (Read 904 times)

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Offline Cut4fun

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Guide Bar & Saw Chain info explained
« on: March 19, 2013, 05:20:17 pm »
So the newer guys can learn chain and bar questions answers by just reading.


http://www.madsens1.com/muu_barchain.htm

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Offline Cut4fun .

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Offline SawTroll

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Re: Guide Bar & Saw Chain info explained
« Reply #2 on: October 16, 2014, 07:01:20 pm »
So the newer guys can learn chain and bar questions answers by just reading.


http://www.madsens1.com/muu_barchain.htm


There is a lot of good info there - but be aware there are some inaccuracies, as they assume that 3/8" chain has a .375 pitch. It isn't, the pitch is more like .366.

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Re: Guide Bar & Saw Chain info explained
« Reply #3 on: January 01, 2015, 12:36:30 pm »
So the newer guys can learn chain and bar questions answers by just reading.


http://www.madsens1.com/muu_barchain.htm


There is a lot of good info there - but be aware there are some inaccuracies, as they assume that 3/8" chain has a .375 pitch. It isn't, the pitch is more like .366.

It must be close to .375 because when I take my dial calipers and measure from center to center every third rivet and divide by two it is always close to .375.
PP 505, 475, 445.

Offline Cut4fun

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Re: Guide Bar & Saw Chain info explained
« Reply #4 on: January 01, 2015, 12:45:30 pm »
Only thing I have noticed 3/8LP to 3/8 is the drive link on 3/8LP being smaller aka shorter. Length about dang same and drive link count per reel roll the same.
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Offline Cut4fun

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Re: Guide Bar & Saw Chain info explained
« Reply #5 on: January 01, 2015, 12:47:21 pm »
I was told and read the reason for 3/8LP being called .365 was to differentiate it from full 3/8 .375 so not to confuse people.
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Offline Eccentric

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Re: Guide Bar & Saw Chain info explained
« Reply #6 on: January 01, 2015, 03:20:19 pm »
Both 'regular' 3/8 and LP are the same pitch (same distance between rivet centers).  The tie straps and drivers on LP are shorter than on 'regular' 3/8" pitch.  That means that an LP sprocket must have a larger diameter than a 'regular' 3/8" pitch sprocket of the same tooth/pin count (both at the powerhead and at the bar tip).
-Aaron

For older saws:
Tune the H side so that it 4-strokes (burbles) at WOT unloaded and just cleans up when under load.
When you lift cutting load, the saw should immediately revert to 4-stroking.  Fine tune the transition point for the wood you're cutting.

Offline 660magnum

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Re: Guide Bar & Saw Chain info explained
« Reply #7 on: January 01, 2015, 04:49:52 pm »
Seems as though 6 tooth spur is rather popular on 3/8ths LP whereas 7 tooth is most popular on regular 3/8ths
We should share what we know... someone may learn...
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Re: Guide Bar & Saw Chain info explained
« Reply #8 on: January 01, 2015, 05:09:21 pm »
I am thinking the 6 is because most saws that use 3/8LP are small cc not much torque. 
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Offline Eccentric

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Re: Guide Bar & Saw Chain info explained
« Reply #9 on: January 02, 2015, 03:01:46 am »
Makes sense to me.
-Aaron

For older saws:
Tune the H side so that it 4-strokes (burbles) at WOT unloaded and just cleans up when under load.
When you lift cutting load, the saw should immediately revert to 4-stroking.  Fine tune the transition point for the wood you're cutting.

 

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