On a typical wood or metal cutting blade the hook or of point of the blade should be pointing down for a vertical blade bandsaw, or for a horizontal blade saw the hook of the teeth should be pointed such that they enter the workpiece first as the blade moves. During regular cutting on a well set up bandsaw the blade will move or bow backwards a bit as you press the workpiece into it. The side guides will assist in keeping the blade cutting straight, but they are not an iron lock on the blade forcing it to cut straight.
This in turn causes the blade to not cut in a straight line. With a dull blade, there is an expectation for it to cut slower and cut crooked. The main thing that normally goes out is the crown, which is what is holding the blade in place, Most of the time the blade is right at the center, but if the crown begins to wear out, it may start allowing more and more movement, causing the blade to not cut in a straight line.
Being a happy bandsaw owner has a lot to do with your approach to coping with the fact that a bandsaw simply will not cut straight, or, in the sage words of veteran woodworkers, “Adjusting for drift.” Even the top performing 14″ bandsaw on the market, Powermatic’s 14 Bandsaw 1791216K, comes with a no-frills fence with 4 bolts on top rather than easy and obvious thumbscrews or knobs that say, “Adjust me here!”. Making the bandsaw cut nice and straight with this fence is a snap.
If the blade twists and the work piece is harder to push through the cutting area, replace the blade. Loose blade tension can also cause the blade to twist and veer off course when cutting the work piece. Check blade tension by pressing in on the side of the blade using a gloved finger.
One of the most common reasons why a bandsaw is not cutting properly is because the blade does not have the proper amount of tension on it. Another cause of a bandsaw not cutting in a straight line is if the blade is too hot. As long as you have the right blade, the right blade tension, and everything is properly attached, your bandsaw should cut in a straight line.
Often the bandsaw won’t cut straight because of issues with the blade. Put simply, the blade tension is how tightly the blade has been stretched. As we mentioned earlier, a dull blade is one of the most common reasons why a bandsaw isn’t cutting straight.
Plus, most of us actually use the band saw more than we realize, so the blade may have some serious mileage on it. If one bearing is too close to the blade and the opposite one is too far away, the blade won’t travel in a true orbit and the saw won’t cut in a straight line. The more teeth per inch, the smoother but also the slower a blade will cut, so don’t push too hard.
band saw blade won’t cut straight Related Question:
Why won’t my bandsaw cut a straight line?
Band Saw: Why won’t my band saw cut straight? When the band saw cuts crooked, a dull blade, improper feeding, loose blade tension or not using a work piece guide could be the cause. Use the rip fence or miter gauge to guide the work piece uniformly through the cutting blade to make straight cuts.
Why is my band saw cutting at an angle?
A bandsaw has a spring that you tighten to keep the blade under tension. Your saw will probably have instructions for how tight to make the blade. This spring can loose its ability to properly tension the blade after some time, allowing the blade to twist in the cut.
Why are my bandsaw cuts wavy?
Re: Band saw Cutting Wavy Cuts. The clasic cause for wavy lumber is pushing a dull blade past it’s limits. Sharp don’t get it.
How much tension should a bandsaw blade be?
For carbon steel toothed blades (cutting blades) this is typically 15,000 to 25,000 PSI. Slitting type blades typically are tensioned in the range of 12,000 to 20,000 PSI. In general bandsaw blades are never tensioned past 35,000 psi.
What causes bandsaw drift?
Drift is cause because the blade buckles under the load. You can see that by stretching a ribbon between 2 points and applying a pressure to one of the edges, it will turn sideway easily. A sharp blade and high blade speed will help a lot with that.
How long does it take to get a WoodMizer sawmill?
And demand is high. “The lead time is 44 to 59 weeks right now for a sawmill,” says Kate Sebring, a sales representative for WoodMizer.
Why do bandsaw blades break?
Machine Defects Even the best blades can fail if there is something else wrong with your bandsaw, and even a small misalignment of bearings or guides can put a twist in the blade as it goes around. Resulting in tension being applied in all the wrong ways which will lead to early breakage.