Bending Pressure
V		4	6	8	10	12	14	16	18	20	24	28	32	36	40	45	55	60	65	70	80	90	100	120
b		2.8	4	5.5	7	8.5	10	11	12.5	14	17	20	22	25	28	31	38	42	46	49	58	63	70	85
R		0.7	1	1.3	1.6	2	2.3	2.6	3	3.3	3.85	4.5	5	6	6.5	7	9	10	11	12	13	14	15	19
S	0.5	40	30
	0.6	60	40	30	30
	0.8		70	50	40	30											This Chart is calculated according to the plate of tensile strength o b=450N/mm2 and length L=1m. the force can be got according to the proportion while different kind of plate and length to be bent.
	1		1.1	80	70	60
	1.2			120	100	80	70	60
	1.5				150	120	110	90	80
	2					220	190	170	150	130	110
	2.5							250	220	200	170	150	130
	3								330	290	250	210	180	160
	3.5									400	330	290	250	220	200	180
	4										470	370	330	290	260	230
	4.5											470	410	370	330	300	240
	5												510	450	400	360	300	270	250
	6															520	430	390	360	340	300
	8																	700	640	600	520	460	420
	10																				810	720	650
	12																						950	780
	14																						1300	1100