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Post by kraftt on Dec 11, 2018 14:14:13 GMT -5
Short track is clamped both ends of door, blade is an ok 24 tooth, scored first, did not lift blade or restart cut - finished cut plunged from start to finish. You can always hear the blade/motor react as if it encountered something when this happens but in this case it's just soft wood, no nails or staples. I'm wondering what draws the blade in like that. Still clamped, I'll go back over cut thinking I can 'erase' saw mark but no.  |
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Post by huntsgemein on Dec 11, 2018 16:59:27 GMT -5
Could be any of a frustrating variety of causes. Or even a combination.
Arbor float. Inconsistencies in material density, knots, lateral variations in hardness, small variations in feed speed, a pinching "tapered cut" resulting from non-parallel setting of the fence in relation to the blade, differential tooth sharpness on each side of the blade causing plate flex, inaccurate, inconsistent or asymmetric tooth sharpening geometry. Plate flex of the blade. Asymmetry (non-linearity) of the cutting plane of the blade to an offset riving knife (if fitted). Ordinary, plain "bad luck". All possible causes.
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Post by kraftt on Dec 11, 2018 23:16:23 GMT -5
Thank you, oddly I find all those variables comforting knowing it can 'just happen' then. But feed speed stands out as something I can pay more attention to. Thinking that, as you point out, pushing too hard allows saw to accelerate through soft areas only to bog down in denser ones then suddenly spool back up and flex or possibly pull to one side from a few bad teeth. Good summary - thanks.
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Post by arvid on Dec 12, 2018 8:12:52 GMT -5
Thank you, oddly I find all those variables comforting knowing it can 'just happen' then. But feed speed stands out as something I can pay more attention to. Thinking that, as you point out, pushing too hard allows saw to accelerate through soft areas only to bog down in denser ones then suddenly spool back up and flex or possibly pull to one side from a few bad teeth. Good summary - thanks. Heat can also cause the blade to wable a little bit. |
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Post by jimbouk on Dec 12, 2018 14:05:05 GMT -5
I would have thought it was feed rate or put another way push speed. A slight pause I have noticed will do that.
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Post by huntsgemein on Dec 12, 2018 15:55:42 GMT -5
The symptoms that you've pictured are caused by either arbor float, plate flex or possibly slight workpiece lateral movement. Which one of the 3 possible causes, and how it is manifest is down to you to diagnose, unfortunately.
For what it's worth, a new-ish, supersharp blade is less likely to unevenly excavate the sides of your kerf. Modern thin-kerf blades are more likely to flex & wander than more traditional, old-school thicker plates.
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