Making the bandsaw table
Ideally, I would have used two layers of baltic birch plywood and half the work I did to make this table could have been skipped.
But instead I used two layers of cheap import plywood. Though it has thin layers of ply, it also has voids and overlaps. And the top layer is not very thick, so I was concerned about it wearing though.
So I milled some veneer to glue to the top. I cut a 21 mm thick maple board into four layers on the table saw, using a very thin 7 1/4" skillsaw blade. Cutting from both sides, it didn't quite make it all the way through, so I used my bandsaw to cut through the middle part.
I glued two pieces side-by-side. But I wanted to make sure it was smooth and even, so I planed it. It's tricky planing stuff down to 3 mm. The planer doesn't adjust that far down so I had to plane it on top of another piece of wood.
Also, to avoid having the front of the boards catch the planer head, I started the planer with the start already past the cutter head. On my first attempt the planer kicked back the wood as it started. So I had to start it with the head raised slightly so it wouldn't engage the wood as it spun up. Once started, I had to crank it down to the actual thickness. This meant the start of my "boards" didn't get planed, so I had to repeat this step feeding the wood in the opposite direction to plane the other end.
I then glued all my 3 mm thick veneer pieces side to side to make a panel big enough for the bandsaw table. I used some dumbbells to force the joints flat against my workbench to get them aligned properly.
I wanted to use the same pad and clamping cauls to clamp this sandwich together, but I noticed that the workbench bowed down from the clamping pressure, and if I glued it like that, that bow would end up part of the table as well.
So I unclamped it again and just used a whole bunch of clamps, including my long reach clamps to clamp it together.
Instead of the long reach clamps, I could have drilled some holes in the bottom table layer (which is on top here) before starting the clue up, and then put wood screws in those holes to clamp the two layers together.
On my last bandsaw build, cut the hole for the insert before gluing the layers together so I could use clamps through that hole to clamp it near the middle. I have more long reach clamps now than I did then.
It turned out, the top ended up having some waviness to it, probably because the board I was planing the veneer on top of wasn't entirely flat. So I used a hand plane to plane out some of the high points.
The corners are joined with butt joints to make it easier.
I also free-hand cut the corners off to approximate rounded corners on the table saw.
Then cutting slots for splines in the corners. I clamped a stop to the table saw fence and raised the blade to a height where it cut as high as it cut deep with the fence. After cutting one slit, I flipped the workpiece and cut again to cut the second slot.
Fortunately I set my stop and table height accurately enough so that the first slot matched the second slot that I cut after I flipped the workpiece.
I then flush trimmed the splines on the table saw.
I should have waited to cut the corners off until after I cut the splines, so I wouldn't have had to cut the splines round too.
If I had used two layers of baltic birch instead of the cheap plywood that I used, I could have skipped the veneer and trim around the edges.
That said, the baltic birch is not as hard as the maple I used for the top and trim, so this is better.
The trunnions are designed to put the axis of rotation when tilting the table at the top of the table so that when the table is tilted the blade still goes through the same spot in the table. But I designed my trunnions assuming that the table top was 36 mm (2x18 mm) thick.
But my plywood and veneer sandwich was a bit thicker than that, so I had to trim a little bit off the trunnions to compensate. The radius of the trunnions is 11.5 cm, so the bottom of the trunnion should end up 11.5 cm below the table top.
Then placing the table on the bandsaw for the first time. I moved it around a bit to decide where it seemed best in terms of how much table in front of the blade and how much behind it, also how much on the left and right side.
I prefer to have more table left of the blade than right of it, so the table doesn't stick out from the saw as much. A primary advantage of a large bandsaw table is not so much for large stock, but for piling small workpieces onto if I cut more than one of something.
Then continuing to route, setting the router about 3 mm deeper with each pass. Towards the end, I had the bit not all the way in the chuck so it stuck out far enough to reach the 41 mm through the table.
It occurred to me cutting this insert hole might be a good application for a CNC router, but it would have to be with a larger bit because cutting this deep with a 1/4" bit isn't a good idea to just let the a CNC do blindly.
With the table loosely placed on the trunnions, I positioned it so that the blade is centered in the hole side-to-side, but towards the back of the hole front-to-back. I just need enough room behind the blade to make sure it doesn't hit the back of the hole. But its useful to have more room front of the blade guides, especially for getting wide blades in and out. For blade changes, the blade needs to pull out of the guides and turn 90 degrees before I can move it through the slot on the side.
After that I marked a line front to back on the bottom of the table, lined up with the center of the insert hole. I made sure the trunnion was positioned centered on this line and perpendicular to it, and tapped the mounting screws to make divots.
Also cutting a corner off the lower blade guide body. This cut is actually in my bandsaw plans, but I neglected to make it when I made the lower blade guide.
Of course, I have the shape of that cavity marked in the plans, but it can be better to just see how things fit and make them fit, so I don't end up cutting away more material than necessary.
I then cut out a rectangular piece of baltic birch plywood to serve as an insert. I cut the slot in that one by letting the saw run and sliding it into place. Though it's best to widen the slot a bit where the blade goes through so it won't kink the blade when the table is tilted.
It seems I always made knobs with either three or five points, but when I made these clamps I used some bolts with knobs already on them, and those knobs have four points. I quite liked the feel of the four pointed knobs when turning them, so I changed my knob templates for this saw to be four points instead of five.
A 14 mm hole was just right for pressing a coupler nut for 3/8" bolts into to make a threaded knob. Threaded knobs are surprisingly expensive to buy, but a coupler nut pressed into a piece of plywood makes a quick, cheap and sturdy threaded knob.
Motorizing this bandsaw (2021)