Sawmilling againI previously covered using my homemade sawmill here, here and here. But every time I set it up it's a new adventure, so I thought I'd cover it one more time.
Setting up the mill. I drew up a better log bed in the plans based on previous experience, but I had never actually built it like that myself. So time to test that design.
I put the big 2 HP motor on it again. I only use that motor for milling.
These log holders just fit on the crossbeams (or rungs) of my log bed, only held in place by gravity.
The log holders were very effective at holding the log steady. But when cutting oak, I was still getting oscillating in the mill. My sawmill is just not stiff enough. A solution would be to build everything much heavier, but that would also make it less portable.
What didn't work so well was my favourite type of screw — drywall screws. I broke the head off one of them. I unscrewed the rest of the screw with vise grips, then switched to "proper" wood screws, which didn't break.
The log was a bit too small for my log holder, so I stacked some blocks under it to get it to the right height.
I never intended this mill to be used with coniferous trees. Coniferous trees are dry and sappy, so some sort of detergent soap drip system is usually employed to keep the blade from gumming up and keep it cool. But my mill is made of wood, with MDF wheels. So I'm not keen on getting it wet.
Every time I have had drift problems with this mill, the blade drifted up. I experimented with tilting the first blade guide downwards a bit by putting shim in it, and for the first time, I got the blade to drift down.
If I ever build another sawmill, it's tempting to make a tilt-adjustable guide. But a wider blade, and especially wider wheels with a shallower crown on them would probably also help to get the blade aligned better for less drift.
In my experience, once I have one of my upright bandsaws properly set up, there is no need for drift adjustment on the fence.
The mill was really struggling with the spruce, the blade and the thrust bearing were getting quite hot. There were also a lot of wood fibers stuck to the blade. It really wasn't designed for softwoods. I was ready to give up on this log when I took this photo.
But I figured, maybe just a bit more. This time, I pushed harder on the feed and, surprisingly, cutting faster worked better. Maybe the teeth on the blade were getting too dull to effectively hook onto the fibers with the lower feed rate.
The 2 HP motor didn't slow down a bit, so I think I still had power to spare.
With the higher feed rate, some of the fibers even cleared off the teeth on their own. So maybe this would work without lubrication. But I suspect sap buildup on the blade would be a problem eventually.
The tarp on the ground really made cleanup easier. Getting sawdust out of the grass is really hard. But I should have set the sawmill up closer to one edge of it, because it really shoots out the dust on one side, especially as I was motoring through the spruce. I only made a bit more than one five-gallon bucket of sawdust this time, not as much as last time.
The bandsaw that I use for the mill is the bandsaw I use the least often. Before using it to build a lawn chair, I hadn't used it for 14 months straight! But it gets more than it's share of abuse, and I have made more sawdust with this saw than I have with my other two homemade bandsaws combined!
An earlier article on
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