It means that you need to keep in mind what you want to do with the blade before picking one out.
When choosing a bandsaw blade there are three main characteristics to keep in mind: width, tpi and tooth form.
The width of the blade determines how tight a radius can be cut. The narrower the blade the tighter the radius. An 1/8th" blade can make an 1/8" radius cut, while a 1/2" blade can cut around 5" radius.
TPI and blade form will also influence the cut.
The greater the TPI the smoother the cut, however that doesn't mean that more is always better. It's good to have at least three teeth in the cut, but having too many teeth can clog things up.
If you are working with thick material it will be harder for the blade to carry away the sawdust that collects during the cut. This means that you want a blade with a larger gullet, so a skip or hook tooth would probably be a better choice.
Hook tooth blades are a good choice for resawing, because the large gullet can carry away the sawdust and the set of the blade helps make it a more aggressive cut.
A narrow standard tooth blade would be good for making tight turns in wood that isn't too thick. A narrow skip tooth blade might be better if the cuts were getting bogged down.
As you can see, choosing a blade is often a matter of compromising between various characteristics to get the blade that works best for your particular project.
If you are making bandsaw boxes
the blade you choose will depend on the material you are using and how tight a radius you need.
There are also specialty blades available that can do everything from cutting metal to fiberglass, but that discussion is for another time and place.
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