Help my poor brain

[StihlEchoingHusky]

Please help my walnut sized brain under stand this!!!!

So how does a 24 inch and down chain fit both Husqvarna and stihl? but once you hit 28 you need 2 more links for the husky? If the same 20 inch chain can be used on a 20 inch Husqvarna bar and also be swapped over to a 20 inch stihl.. were da hell does the 2 extra links come in? Utilizing the same 28 inch stihl light bar on either of my "bigger" saws if it's on the 372 it needs more. I could understand if it was because of a different tip sprocket or maybe clutch drum sprocket but it's the same on both.

 

[StihlEchoingHusky]

*f-wording witch craft!

 

[Wilhelm]

Given that You are utilizing the exact same 28" bar on both Your Husqvarna and Stihl and both saws run the same pin count drive sprocket:
- bar mount slots are not the same length between the 20" & 28" bars
- bar mount tensioner hole is off set on the Stihl 28" bar compared to the Husky 20" bar
- bar stud position and/or span is not the same between the Husky and the Stihl

Compare the bar mount stud slots between the bars, it sounds as if the 28" bar has a shorter slot.

Or

Compare the position of the bar mount tensioner holes, it may be more towards the PH end on the 28" bar which prevents it from sliding all the way back to the sprocket on the Husky.

Or

A combination of both aforementioned scenarios.

Such fun and joy chainsaws bring to Ones life!

 

[Squish9]

I run into this some times. It's the slot length in the bar being shorter than others. I just use a file to lengthen the slot so I can run the same chains on the Stihl / husky / Dolmars

---

 

[Wilhelm]

I run into this some times. It's the slot length in the bar being shorter than others. I just use a file to lengthen the slot so I can run the same chains on the Stihl / husky / Dolmars

---

There!
Although I don't own a single Stihl bar it would seem I wasn't off too far.

Cheers

 

[hacskaroly]

Please help my walnut sized brain under stand this!!!!

Here is another for you...
Stihl files for 3/8 chain are 13/64"
Husky files for 3/8 chain are 7/32"
Stihl files for 404 chain are 7/32"

Sometimes customers world bring in their saw that had a different brand bar than the saw an I would have to make a custom chain for it. I would have to make it a little bigger than what I thought and knock off links until it fit.

 

[Wilhelm]

Dolmar 3/8" chain: 7/32" (5.5mm) from new till half life, 3/16" (4.8mm) from half life till end of life.

 

[StihlEchoingHusky]

Here is another for you...
Stihl files for 3/8 chain are 13/64"
Husky files for 3/8 chain are 7/32"
Stihl files for 404 chain are 7/32"

Sometimes customers world bring in their saw that had a different brand bar than the saw an I would have to make a custom chain for it. I would have to make it a little bigger than what I thought and knock off links until it fit.

*s-word so I've been using the wrong file this entire time.

 

[StihlEchoingHusky]

guess when I was in elementary school I should have paid attention to Bill Nye.

 

[hacskaroly]

*s-word so I've been using the wrong file this entire time.

It really comes to personal preference...I follow Wilhelm's strategy with my 3/8 chains (stuff in parenthesis I added as I don't have access to Dolmar chain):

Dolmar (Stihl, Husqvarna...etc) 3/8" chain: 7/32" (5.5mm) from new till half life, 3/16" (4.8mm) from half life till end of life.

 

[StihlEchoingHusky]

It really comes to personal preference...I follow Wilhelm's strategy with my 3/8 chains (stuff in parenthesis I added as I don't have access to Dolmar chain):

So changing file size at half life. What exactly does that do? Id imagine that it would Change cutters geometry for strength maybe? since the cutter is getting smaller. Would you change file angle aswell?

 

[Wilhelm]

It really comes to personal preference...I follow Wilhelm's strategy with my 3/8 chains (stuff in parenthesis I added as I don't have access to Dolmar chain):

Dolmar chain is rebranded Oregon chain.

Same deal with Dolmar bars.

 

[hacskaroly]

So changing file size at half life. What exactly does that do? Id imagine that it would Change cutters geometry for strength maybe? since the cutter is getting smaller. Would you change file angle aswell?

The front of the cutter is taller than the rear, so you use the larger file for the first half of the cutter and then switch to the smaller file for the 2nd half as it starts becoming shorter. There is only a 1/64 difference between the file sizes. File angle stays the same.

 

[Wilhelm]

So changing file size at half life. What exactly does that do? Id imagine that it would Change cutters geometry for strength maybe? since the cutter is getting smaller. Would you change file angle aswell?

You can keep the recommended file position under the cutters top plate without filing into the tie strap.

Also, You will get a tad bit smaller "C" cutter profile which may result in higher cutter strength, don't really know.
It does give a bit more aggressive cutter, which is fine since the half way filed back cutters make a noticeably narrower kerf than a brand new chain.

Only the file OD changes, everything else stays the same.

 

[Woodwackr]

guess when I was in elementary school I should have paid attention to Bill Nye.

No one should pay much attention to Nye…

 

[StihlEchoingHusky]

No one should pay much attention to Nye…

I was just referring to when he says science rules. In other words science is knowledge. Knowledge is power!

 

[Woodwackr]

I was just referring to when he says science rules. In other words science is knowledge. Knowledge is power!

He wouldn’t know…he’s not an actual scientist

 

[StihlEchoingHusky]

He wouldn’t know…he’s not an actual scientist

Ya isn't he a mechanical engineer or something like that?

 

[drf256]

Different bar profiles require different DL’s. I had a hard time explaining this to a guy I built an 026 for. He went and got a .325 chain for it based upon the 16” bar he used on his MS250. I kept trying to explain to him that they were different bar mounts and took different DL’s, even though they were both listed as “16 inch” bars. He finally got it.

At least for the 72 DL 20” bars, the Husky bars are narrower than the Stihl ones. That’s how they both take the same chain.

 

[Loony661]

For what it’s worth, on any 3/8 chain, I use a 7/32” file from start to finish. Filing a little bit of the top of the tie strap may look bad, but I’ve never broken a chain. And I’m logging hardwoods daily, and file my teeth down, and use them, until they start breaking off. Don’t worry about switching file sizes unless you want to play around.