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Question for swing millers

Started by starmac, November 23, 2017, 02:10:19 PM

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starmac

This question would also pertain to mobil deminsional mills, or any mills that you do not turn the logs.

When you get a log with stress in it, how do you deal with it.
I am lucky in this regard as I mostly saw white spruce and the percentages of logs with much stress is pretty low, low enough that they just get turned into firewood, instead of turning and trying to relive the stress.
Old LT40HD, old log truck, old MM forklift, and several huskies.

Grandedog

     Howdy,

   By leaving one side of the log attached in a step fashion, it keeps the log from cupping, or bowing.

Regards
Gregg
Gregg Grande
Left Coast Supplies LLC
1615B South Main Street  Willits, CA 95490
888-995-7307  Ph 707-602-0141                   Fax 707-602-0134  Cell 707-354-3212
E-Mail  gregg@leftcoastsupplies.com   www.leftcoastsupplies.com

terrifictimbersllc

One takes off boards from left to right, leaving a level surface after each layer. If stress bows this surface, one can skim it flat again with a shallow saw cut.
DJ Hoover, Terrific Timbers LLC,  Mystic CT Woodmizer Million Board Foot Club member. 2019 LT70 Super Wide 55 Yanmar,  LogRite fetching arch, WM BMS250 sharpener/BMT250 setter.  2001 F350 7.3L PSD 6 spd manual ZF 4x4 Crew Cab Long Bed

dgdrls

Amazing how some logs will move when you saw them.

The link talks about sawing eucalyptus with a dimension mill and the potential "crook" or "bow"

http://www.nzffa.org.nz/specialty-timber-market/information-resources/sawmilling/hardwoods/sawing-eucalypt/sawing-eucalypt-with-mahoe-multi-blade-circular-sawmill/

D

starmac

Does these methods work as well as turning the logs, as far as finished boards?
Old LT40HD, old log truck, old MM forklift, and several huskies.

Ianab

Probably similar. When you are having to turn a log to counter stress you still wont get perfect results either. The idea is to get the boards "good enough" so they don't go in the reject pile. Because you reference the next board off the last cut, which will be straight, and the log itself tends to get "skimmed" by the horizontal blade, even if the log does move a little it's gradual, and a fraction of an inch for each board as they come off. The boards themselves may move more, but they are still sawn "true". Weight during drying, and straight line ripping once dry are things that help later.

Of course some logs just don't want to be sawn, and that doesn't matter what mill you use.  :D
Weekend warrior, Peterson JP test pilot, Dolmar 7900 and Stihl MS310 saws and  the usual collection of power tools :)

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