FORMULA SHELF 1 of 370

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Workshop 1 formulas

Saw teeth per inch

TPI = 1 / (2 x gullet depth in inches)

SYMBOLS · for a rip cut in hardwood use 4-6 TPI, for a crosscut 8-12 TPI, for a hand saw 10-14 TPI

UNITS · teeth per inch

HOW TO USE

The difference between a saw that cuts along the grain and one that cuts across it. A rip saw has few deep teeth; a crosscut saw has many fine ones.

EXAMPLE

A 3/32 in gullet gives 1 / (2 x 0.094) = 5.3 TPI, a rip saw.

saw tpi teeth rip cut crosscut

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