HELP! Bore cutting with longer bars

[Kerfed]

Bore cut this 17" DBH dead Ash with the 28" bar for practice. Way too much kickback getting the plunge started. I definitely think it's the chain, and not just the extra chain speed from the longer bar. It's really grabby. It's a new bar and chain, so I'll keep at it and see if it settles down with some more use.

Thanks for all the replies and suggestions!

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I always use a straight handled axe when bore cutting, makes all the difference… Sounds like the chain is too aggressive and hopefully you have an easier time next sharpen or as it dulls a bit. We run full skip on bars over 20” and having rakers too low or angle too steep sure hones technique as the chain is unforgiving. Watch your body position and keep a full thumb wrap too.

 

[Hundred Acre Wood]

@Hundred Acre Wood square skip?

Full comp full chisel

edit: round filed

 

[Timjus]

keep your chain tight and use progressive raker gauge
i do boring with 28" stumura with c85 chain and its very smooth. new or filed with roller file guide+prog. raker gauge

 

[davidwyby]

Australian feller said to try pushing to side…? Ain’t tried it yet.

 

[Dustin4185]

I have noticed the same thing with any lightweight bar. My 28” Stihl light on a 462 or 500i kicks back pretty bad if you don’t just let it eat after you get it started.

 

[sawfun]

Use the same angle of approach but stay at that angle longer and make sure your chain is sharp. I had a giant maple that was 8 foot at the base with all of the burl buttresses. That required a dozen or more (too tired to count) plunge cuts in order to save as much of that nice wood as possible. That was like 10 years ago using a Mac 125 with 50" bar. It was a hot day and the folks i did it for really felt sorry for me, though it was fun.

 

[davidwyby]

Australian feller said to try pushing to side…? Ain’t tried it yet.

Tried it. Works well. Twisting as well. Works like a friction shock. @Loony661 also taught me to just push harder, and put your legs/body behind the saw to dampen the kick. I haven't had trouble boring with a ported 2188 36" LW in dead oak round oregon full chis full skip.

 

[Loony661]

Tried it. Works well. Twisting as well. Works like a friction shock. @Loony661 also taught me to just push harder, and put your legs/body behind the saw to dampen the kick. I haven't had trouble boring with a ported 2188 36" LW in dead oak round oregon full chis full skip.

A logger who I know that’s been in the woods over 40 years taught me that - when I was “green” I used to try and let the saw do the work, but that doesn’t work well when boring. You gotta put your body into it a bit and let the chain eat, otherwise it’ll just try to nibble and buck on you every time.