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Author Topic: Chain Speed  (Read 8811 times)

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Offline Ward Barnes

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Chain Speed
« on: April 10, 2017, 07:05:16 PM »
Howdy Folks:

I have an almost new Stihl MS250 with a factory 20 inch bar and chain.  With the engine not under load and at WOT how many times would a tooth pass a certain point on the bar in a given time period?

I work in a (gulp) big box store and we sell a lot of chainsaws to one time or causal user type people, however, we sell very few safety items such as chainsaw helmets or chaps.  If I could educate our employees and customers it could save a life.

God Bless, Ward and Mary.
7 year old Stihl MS 390.  New Stihl trim saw MS 250.  Kubota BX 2200 tractor.  2005 F150 4X4.
Dull chains cause accidents.  Accidents cause shorter life spans.
You don't sharpen a chain when it gets dull.  You sharpen a chain to keep it from getting dull.

Offline dougand3

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Re: Chain Speed
« Reply #1 on: April 10, 2017, 11:37:02 PM »
Roughly, the chain travels at 88 FPS when engine RPM is 12k. So, if your chain is 48" long, 1 tooth should travel 22 rotations in a second.
Husky: 372xt, 272xp, 61, 55 (x3)...Poulan: 315, 4218 (x3), 2375, 2150, 2055, 2000 (x3)...Stihl 011AVT...Homelite XL...Saws come in broken, get fixed or parted, find new homes

Offline Jesper Jepsen

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Re: Chain Speed
« Reply #2 on: April 11, 2017, 02:57:45 AM »
I believe that the MS 250 is a class 1 saw that means 20-22m/s chain speed. So simply put for each second the chains bite into your leg it moves 20m(60 feet).
That means on a 16" chain it has the ability to (in theory) to cut 15-16" deep each second so two- three seconds at the most for a leg.
In Denmark the biggest problem is also to get Mr and Mrs. Denmark to buy safety gear and not think as a chain saw is a toy og just a fancy hand saw.

Jesper

Offline Kel71

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