This interests me, primarily because I haven't used one and don't have one. How is it that a band saw is that useful?
Not that I have much room in my shop for anything else.
I should actually qualify my original statement, but first some background: I have two band saws in my inventory, a newer 20" JWBS-20 and a vintage 32" Crescent. I also own a table saw, a 2200 lb. 5 hp Oliver with a 40" x 42" table, a rolling table with quadrant, dual arbors for 14" blades, and the capability to run a single blade up to 22" diameter. It's a monster of a machine, the only similar example manufactured today being the Northfield No.4.
When I was just starting out in woodworking, I was looking for the best way to add capability at minimal cost. I grew up using a radial arm saw, albeit a crappy Craftsman / Emerson 10"/12" unit, and knew they could be very flexible. I also knew they could be inaccurate, flimsy, frustrating, and dangerous. Reading all the best woodworking magazines of the day, I had it in my head I needed to shop table saws first, as I saw guys finding ways to do every possible operation on a table saw, but like you, I was looking to work with some pretty large architectural timbers.
Because of the specific job I had to do, I ended up buying the Jet JWBS-20 bandsaw, 20" throat and ability to saw 11" thick stock, at least in theory. I used it for ripping miles of timbers for beams and flooring. Because it was the only machine I had, I found ways to use it for other jobs, and began to realize that the bandsaw is really the analog to the hand saw. It makes a thru cut, and is an ideal machine for cutting tenons, shoulder mortises, ripping heavy stock, re-sawing planks, you name it.
Shortly thereafter, and looking for something that could compliment the band saw, I came back around to the radial saw. I learned of some of the very heavy and accurate radial saws made (WW2 vintage) by DeWalt and Delta, and more recently by Original Saw company. I found a heavy 1948 vintage DeWalt GE, an increadibly precise machine, which carries a 16" blade. The compliment of the two handled every job I needed to do, and I was set for a long time.
The table saw came along some time later, and by then I had two jointers, a planer, and a host of other small equipment. The table saw can plow a dado or rabbet, but so can my router or the radial saw. The table saw can rip, but so can my band saw. In fact, I found that almost every job that needs doing can be done better by one of my other machines, with the following exceptions:
1. The table saw can rip more safely than a radial saw, and more quickly than the band saw. It can leave a glue-line edge, like the radial saw, whereas the band saw rip requires planing to clean up.
2. In dado mode, the table saw is
removing a specific amount of material, as the amount of blade protrusion up thru the table is fixed. If your stock varies in thickness, you are always removing the same amount of material. Conversely, the radial saw is always
leaving a specific amount of material, as the fixed variable in that configuration is the space left between the blade and the table. Again, this can be useful when performing precision operations, if your stock is less than 100% consistent (always).
The table saw is also a very fast machine for many jobs, cutting much more quickly than the band saw, and requiring less setup time than the radial saw. But I'm not working in a production shop, and I don't like to rush when I'm in the woodshop, anyway.
Recently I moved, and now I'm doing a lot of work on my 1770's vintage house, making new windows to fit the original sash, new wooden storm windows, cabinet doors, mouldings, etc. I have not set up my "permanent" new shop yet, and I'm temporarily working out of a detached garage, with extension cords strewn to various machines. I have set up my radial saw, the 20" band saw, my little 6" jointer, my 12" planer, and a crappy store-bought router table. The big table saw sits in the corner, with a dozen other things piled atop it. It would be great to have it set up for a few operations, but it's less flexible than the band saw / radial saw duo.