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Saw Design Formulas |
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Formula sheetThese are the formulas used to design and select circular saws and bandsaws. For now, only the formulas and the definition of the variables are given. Later we will add a more complete explanation of what these formulas mean. Saw and Tooth Shaped Circular saw diameter or bandmill wheel diameter (inch) L Length of bandsaw blade z Distance between centers of bandsaw wheels P Tooth pitch (inch) n Number of teeth k Kerf h Thickness of saw plate s Side Clearance (inch) sMIN Minimum recommended side clearance (inch) a Gullet area (sq. inch)
Operating ConditionsN Shaft speed (rpm) c Blade ( or rim) speed (sfpm) b Bite per tooth (inch) D Depth of cut (inch) f Feed speed (fpm) fMAX Maximum recommended feed speed (fpm) fMIN Minimum recommended feed speed (fpm)
Performance PredictionGFI Gullet Feed Index = Volume of wood removed by a tooth --------------------------------------------- Volume of tooth gullet
GFIMAX Maximum allowable Gullet Feed Index = 0.3 for circular saw = 0.7 for bandsaws
Power ConsumptionE Estimated power required (hp) C Energy factor depending on wood properties C = 35 for North American softwoods = 40 for dry fir = 70 for hardwoods
Evidence from the WoodX Distance taken by ‘m’ bites on a board m
Formulas
3.14 x d x N 12 x c c = ------------------------- or N = ----------------- 12 3.14 x d
b = X / m or X = m x b
For Bandsaws only......
L = 2 x z + 3.14 x d
For Circular saws only………
3.14 x d 3.14 x d P = ----------------- or n = ----------------- n P
12 x f b x n x N b = ------------- or f = ------------------- n x N 12
For Circular and Bandsaws.....
b x c f x P f = ----------- or b = ----------- P c
b x D GFI x a GFI x a GFI = ------------ or b = ----------------- or D = ----------------- a D b
f x D x P GFI x a x c GFI = ------------------ or f = --------------------- a x c D x P
GFIMAX x a x c fMAX = ----------------------------- D x P
s x c f x P fMIN = ----------- ( b = s ) or sMIN = ----------- P c
k - h s = ---------- or k = h + 2 x s 2
C x k x f x D E = ------------------------- 144
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