Bandsaw Physics: Why Blades Drift in Resawing

By Matthias Wandel | Posted: 12/21/2012 4:32PM

 

Explaining the physics of resawing on the bandsaw, and what leads to blade drift, when to use finer blades, and blades with deeper teeth.

 

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Trevor    
Canada  |  January, 07, 2013 at 08:41 AM

Apparently this person doesn't understand the difference between swedge set saw blades and spring set saw blades. What he is describing applies to swedge set saw blades where each tooth cuts the full width of the kerf and creates a fairly large chip. These big chips will be removed from the kerf because they are too large to bleed to either side of the blade. I believe 75% is the "fill-able " area of the gullet, any more than this and the blade will start to vibrate, releasing chips from the gullet when it is overloaded. Some sawyers using swedge set saws feed the log until the blade vibrates then back off the feed slightly, this is how they know the blade is cutting at maximum capacity. Spring set saws create very fine saw dust and most of it bleeds to either side of the blade. This is why we get a lot of dust remaining on the board even with dry lumber and in frozen logs the dust will re-freeze to the log and board. Most small saws don't have the wheel size, strength, blade speed or horse power to do any serious re-sawing without problems never mind his home built wooden band saw.

 

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