Author Topic: chain theory  (Read 117 times)

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Offline pigpen60

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chain theory
« on: September 11, 2014, 08:10:09 pm »
ok I have a theory about chain, correct me if I'm wrong. say a dolmar 6400 list a 20" as the smallest and what a 32" as the largest. now on the 20 you run a full ? chain and the 32 a skip chain and the 28 a semi. am I on the right track?

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Offline 660magnum

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Re: chain theory
« Reply #1 on: September 11, 2014, 08:15:00 pm »
The oil pump is the limiter. There's just not enough oil output for the 32" bar unless you are in absolutely clean green wood.

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Offline pigpen60

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Re: chain theory
« Reply #2 on: September 11, 2014, 08:50:13 pm »
makes ya wonder why they didn't make a hipo oil pump.

Offline Philbert

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Re: chain theory
« Reply #3 on: September 11, 2014, 10:54:40 pm »
Quote
makes ya wonder why they didn't make a hipo oil pump.

They sell auxiliary oilers for milling.

Generally, i think that your logic is sound.  Part of the chain choice also depends on how much you plan to have in the cut at one time.  If the full bar is buried in the log, a skip-tooth chain will have fewer cutters engaged and less drag on the powerhead.  It will also help clear out the chips.

Some guys say that they like longer bars just for the reach, so they don't have to bend over as far, or get as close to a gnarly log.  E.g. they have a 28 inch bar, but only 18 inches of it is normally in the wood, so full comp chain works fine for them.  But a longer bar also affects the balance and handling of the saw, so there is some personal preference and trade offs involved.

Philbert

Offline 660magnum

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Re: chain theory
« Reply #4 on: September 11, 2014, 11:01:52 pm »
With the Makita 6421 the adjuster on the oil pump is nylon and acts as a "Stop" for the oscillating motion of the oil pump rotating shaft. This adjust wears down and the oil pump shaft eventually begins to rotate in a different area. I don't think the stroke length is materially changed due to this wear though? I always put a new kit in the pump if I tear into that area or have the clutch off.
We should share what we know... someone may learn...
That knowledge can live after us... and that "Pays It Forward".
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