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Tapered butt log - best sawing approach when chainsaw milling?

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Forum topic by JohnMcClure posted 10-17-2018 10:46 AM 478 views 0 times favorited 5 replies Add to Favorites Watch
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JohnMcClure

271 posts in 813 days


10-17-2018 10:46 AM

I have a homemade chainsaw milling rig. It consists of a flat board that I can screw onto a log to create a reference surface; and a piece of plywood bolted via a spacer block to my chainsaw bar, so the plywood is parallel to the bar a set distance away.
This allows me to flatsaw a log, PITA though it is to use, when said log is too heavy or big for me to put it on my 17” shop bandsaw.
It is functionally similar to this:
!http://static.dudeiwantthat.com/img/outdoors/tools/resize(360%2C300)/granberg-chain-saw-mill-21996.jpg!

Question: I have a post oak butt log with substantial taper – about 15” diameter at base, down to 12” at top, 5’ long. The log is not ideal with a bit of “hump” on one side of the base, and a bit of curve to the trunk as well.
My question is, what do you sawyers suggest as the best approach to sawing this log?
IE, shim my reference face on the first cut so I remove a tapered piece first, giving me straighter grain for the remaining bards; keeping the “hump” down, or to one side, or ??

Thanks!

-- I'd rather be a hammer than a nail


5 replies so far

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Fresch

342 posts in 2094 days


#1 posted 10-17-2018 01:55 PM

Depends on your plans for the wood.
1) flat saw for max wood then cut your project out of the board.
2) cut a square cant from the small end going back to larger.

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Steve

663 posts in 755 days


#2 posted 10-17-2018 02:02 PM

Where is the curve in relation to the hump?

I’m far from an expert, but to me this situation seems to be similar to jointing a board with a bow.

I think I would try to get rid of the curve before addressing the hump, but that might depend on where the hump and curve is

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tomsteve

844 posts in 1392 days


#3 posted 10-17-2018 03:12 PM

best bet would be to get your first cut parallel to the pith.

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JohnMcClure

271 posts in 813 days


#4 posted 10-17-2018 05:32 PM

Ok I think I’ll shoot for first cut parallel to the pith. I’ll end up with pie-shaped boards and thus a lot of waste, but I guess its inevitable.
Thanks!

-- I'd rather be a hammer than a nail

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Fresch

342 posts in 2094 days


#5 posted 10-17-2018 06:08 PM

Use the 3/8” cut waste from your chain in your measurements to leave the most good wood.

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