3.1 Calculation formula of cylindrical helical compression spring

Table 12-2-8 Calculation formula of cylindrical helical compression spring

Name			Unit	Formulas and Data
Main calculation formula	Material Diameter d		mm	C=5-8
	Effective coils n		Coil
	Spring rateP’		N/mm
Geometry calculation	Spring diameter D		mm	Estiminated according to the constructions
	Inside diameter D1		mm	D1=D-d
	Outside diameter D2		mm	D2=D+d
	Working coils n2		Coil	According to the construction,See table 12-2-14
	Total coils n1		Coil	See table 12-2-14
	Pitch t		mm	Both ends are circled and ground tightly
	Spacing		mm
	Free height H0		mm	See table 12-2-14
	Height at minimum working load H1
	Height at maximum working load Hn		mm
	Height under working limit load Hj		mm
	Pressure and height Hb		mm	See table 12-2-14
	Helix angle α		mm
	Spring expansion length L		mm