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  1. 29th November 2006, 10:32 PM #1
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    Sculptured Box
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    Default Bandsaw blade drift / wandering?

    I have a theory! The general complaint about bandsaw blades is the "wandering" of the blade when attempting to cut in a straight line.

    However this problem is not evident (no complaints) when using the bandsaw for cutting curved shapes.

    Is this because the cutting edge (the sharp bits) is supported by that back of the blade (e.g. it rests on the bandsawn section)?

    If so, should blades used for re-sawing (depth of cuts exceeding 10cm / (4") ) be wider (e.g. from cutting edge to back of blade) or be tapered from front to back (that is the back of the blade wider than the cutting edge)?

    I probably should have patented this idea?
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  3. 29th November 2006, 10:54 PM #2
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    Drift in bandsaw blades is generally caused by minute differences in the set and sharpness of the teeth. Because most bandsaw blades have a relatively generous kerf you can adjust to approach angle of the timber to compensate for the drift. If the blade had no kerf then I imagine there could be great difficulties in correcting the cut if it starts to drift.
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  4. 30th November 2006, 09:28 AM #3
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    All saw blades are already, in effect, tapered by the set of the teeth at the front. Without any set, the blade would tend to bind in the cut. For resawing, the wider blade helps to reduce drift on straight cuts. The set of narrow blades also enables cutting curves. Also, on curves you're generally hugging one side of the blade so it doesn't try to drift.

    I don't know how on earth (or anyplace else) you would economically vary the thickness across the width. Setting the teeth is simpler.

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