Double ground teeth cut on both the push and the pull, which is what makes a saw fast on structural timber. The trade is that the cut is wider and rougher, so a double ground saw is used where the edge will be covered rather than seen. It is also why a single saw rarely covers a whole job from framing to finishing.
Tooth count sorts the range into stages. First fix at 7tpi and 8ppi cuts fast through structural timber. Second fix at 11tpi cuts more slowly and leaves an edge that does not need cleaning up before it is finished. Tooth count is stamped on the blade alongside the ppi figure on the double ground saws.
A tenon saw is a different tool again, with a stiffened back along the blade. That stiffness is what lets a thin blade cut a joint accurately without flexing, and it is why a tenon saw is used against a mitre box rather than freehand. The back also limits how deep the cut can go before it reaches the timber.
Blade length is chosen against both the cut and the carry. A 550mm saw crosses a wide board in fewer strokes; a 350mm tool box saw fits a bag where a full length saw will not. Both cut the same timber at the same tooth count. Send the timber and the stage to 07754288583 on WhatsApp. Blade length and tooth count are stated together so a saw can be matched to both the stage and the board width.
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