Removing Boards While Sawing a Log
Leaving the boards on the log doesn't put any undue stress on the blade, as it is so narrow that the kerf doesn't close up until the back of the blade is well cleared.
If you are grade sawing, you need to see what the log face looks like and every board should be pulled after it is cut. If you're cutting dimension lumber or siding material, it's okay to let them build up.
The biggest disadvantage of leaving them on the saw, to me, is you have to raise the saw up ever higher over the stack to return it. The advantage is, if you are going to turn the stack to make more cuts, i.e. for stickers or dimensional lumber, there is less handling. I will also let two or three boards build if they are relatively light, and then remove them at the same time in order to save time and energy. And if I have a pokey tailer (usually the customer), I will have him wait till I'm done and while he is offloading, I get the next log on the lift.
I agree with the above post. A stack of cut lumber puts no more strain on the blade than cutting a thick board (or even a log in half). If you are looking at a manual mill, like I run, the cranking up and down to clear the stacked wood on the log, then reset to cut height, is a pain. Plus, as a beginner sawyer, I like to pull each board and give it a quick eyeball (I work by myself - I am the offloader, too) That way I can make corrections if I am doing something wrong or my blade is dulling.
I run a full hydraulic Timber Harvester. When "live" sawing, I'll pull the slabs and boards off until I have a nice square cant. Sometimes, when done slabbing the 3rd side, if I can tell that the board is going to edge nicely, I'll take a flitch, and leave it on top of the cant, and then turn the two of them together so that the flitch's edge is up (the other side of the flitch has a square edge already). This lets me edge the flitch when slabbing the 4th side. It works well with small to medium sized logs (11" - 16"), but not well with larger logs.
Once I've got a cant, and I'm ready to turn it into boards, I leave 2 or 3 boards on the stack. When I offbear, I have a trailer or a loader with a pallet behind me, and I drag three boards back with the mill head, right onto a single board which has been sticked. I then flip the boards onto the sticks, and fill out my layer of boards. (The drawback is that this leaves some sawdust on the boards, which then makes it into the stack).
When I return to the saw, I flip the cant 180 and saw a board for the next row. (Flipping 180 relieves the stress in the log evenly, and helps the lumber come out straighter when it dries.) Then I take 2 or 3 more boards to fill out the layer on the board stack. Sometimes, I can only take 1 or 2 before I have to flip to relieve the stress, though.
When I flip, I take 1/8" "veneer" off the top to even out any waviness or bowing of the cant. This helps keep a consistent thickness in the pile, and makes the graders happy.
Would you like to add information to this article?
Interested in writing or submitting an article?
Have a question about this article?
Have you reviewed the related Knowledge Base areas below?