- Joined
- Feb 13, 2017
- Messages
- 2,138
All these portable band-saws that copy the "Porta-Band"s make me question reality. That is not the word I want, but it will serve. I have used, and possess, a Milwaukee Porta-Band since sometime in the late '70s. My primary use was/is cutting conduit. Although I use it for solid material when a carpenter's circular saw will not cut the material. My biggest issue is when the saw "drifts" from the desired line. Some of this is when the blade loses its' "set", and some of it is my inability to hold the saw steady, especially on a solid material. A portable band saw isn't that heavy to pick up, but over the time it takes to make a cut will often gain weight to the point is has more than trebled. And that's not from old age, the same phenomenon occured when I was in my 20s.
I bring this up to point out that the mechanism for rolling the blade and the metalurgy of the blade make a great deal of difference in "controling" the cut. An older Milwaukee or Starrett blade will maintain its' set longer. No blade will last forever, that's why they make replacement blades. But as the blade loses its' set, it can be controlled to an extent to compensate, giving a "few" more cuts where time is of the essence. When a blade comes out of the package (new) and doesn't cut straight, I scrap the blade and don't acquire any more from that source.
Truing the guides is important here as well. Even a good saw will lose its' accuracy when dropped or repeatedly tossed into a tool locker. A not so good saw may come from the factory that way. The guides MUST be true to each other. If there is any twist across the cutting section of the blade between the guides it will not cut true. I use a thin straight edge to adjust mine, there is probably a tool specifically for this but I'm a cheap old buzzard and never looked for one.
These two points apply to any band saw, whether a portable or a stationary machine. The guides must be true and the blade have the proper "set". There is no negotiation on these two points.
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I bring this up to point out that the mechanism for rolling the blade and the metalurgy of the blade make a great deal of difference in "controling" the cut. An older Milwaukee or Starrett blade will maintain its' set longer. No blade will last forever, that's why they make replacement blades. But as the blade loses its' set, it can be controlled to an extent to compensate, giving a "few" more cuts where time is of the essence. When a blade comes out of the package (new) and doesn't cut straight, I scrap the blade and don't acquire any more from that source.
Truing the guides is important here as well. Even a good saw will lose its' accuracy when dropped or repeatedly tossed into a tool locker. A not so good saw may come from the factory that way. The guides MUST be true to each other. If there is any twist across the cutting section of the blade between the guides it will not cut true. I use a thin straight edge to adjust mine, there is probably a tool specifically for this but I'm a cheap old buzzard and never looked for one.
These two points apply to any band saw, whether a portable or a stationary machine. The guides must be true and the blade have the proper "set". There is no negotiation on these two points.
.