Maximum and working RPM relationship ?

[Lindsay]

Hey all,
quick question here. Got a MS880 that I'm getting ready to mill with and it got me wondering about setting my high speed screw.
My question is if as for an example my max revs is 11500 and it is say 8000 in the cut does lowering the max revs to 10500 lower my in cut revs to 7000 rpm in identicle cutting situations. Is there a direct relationship?

 

[Stihlman441]

Ya got to be really careful on this one there is a rpm limiter on these,if ya going to use it for milling i suggest 30:1 mix.

BobL is the man that is the guroo on this one.

 

[BobL]

Hey all,
quick question here. Got a MS880 that I'm getting ready to mill with and it got me wondering about setting my high speed screw.
My question is if as for an example my max revs is 11500 and it is say 8000 in the cut does lowering the max revs to 10500 lower my in cut revs to 7000 rpm in identicle cutting situations. Is there a direct relationship?

Not really, Cut revs are dependent on a lot of factors other than max RPM. I set mine to 11250 and use 40:1 . In the cut I run it at anywhere from 8.5 - 10k. I don't like running it below 8.5 for too long as I can see the temp gauge creeping steadily upwards when I do that. I'm not convinced t cuts that much faster either. When milling on a slope by itself, the saw tends to sit at higher revs and it takes a little longer in the cut but the saw runs cooler.

The thing to do with all saws is, when ever possible, minimize the engine load and stress. Things like , sharp well set chains, fresh mix, quality lubes, clean air filter regularly, plenty of B&C oil, aux oilers, avoiding pushing, avoid running out of mix and long warm up and cool down times, all contribute to easing the load and stresses.