Convert the load to 3000 IbsConvert the other with inch.Questions.I would u like to calculate all these parts in the scissor jack, the load will be 3000 Ibs, calculate all bellow1-p – Pitch of screw thread (mm)2-l – Lead of screw thread (mm)3-d – Nominal diameter of screw (mm)4-dc – Core diameter of screw (mm)5-dm – Mean diameter of screw6-α – Helix angle of screw (degree)7-W – Load (kg)8-N – Normal reaction9-μ – Coefficient of friction10-P – Effort (N)11-θ – Friction angle (degree)12-T – Torque (N.m)13-η – Efficiency (%)14-Fc – Direct compressive stress (N/mm2)15-Ft – Torsional shear stress (N/mm2)16-Fs – Principal shear stress (N/mm2)17-Ts – Transverse shear stress (N/mm2)18-t – Thread thickness at the core diameter (mm)19-n – Number of threads in engagement with the nut.20-Tn – Transverse shear stress at the root of the nut (N/mm²)21-Pb – Unit bearing pressure (N/mm²)22-k – Least radius of gyration of the cross-section about its axis (mm)23-I – Least moment of inertia of the cross-section (mm4)24-A – Area of the cross-section (mm2)25-Pcr – critical load (N).26-E – Modulus of elasticity (N/mm²)27-Syt – Yield strength of the material (N/mm2)28-M – Maximum bending moment at the critical section29-WT – Tangential load acting at the tooth (N)30-h – Length of the tooth (mm)31-y – Half of the thickness of the tooth (t) at critical section (mm)32-b – Width of gear face (mm)33-Fw – Permissible working stress34-y – Lewis form factor35-Fo – allowable static stress (N/mm2)36-Cv – velocity factor.37-v – Pitch line velocity (m/s.)38-WD – Total dynamic load (N)39-WT – Steady transmitted load (N),40-WI – Incremental load due to dynamic action (N)41-C – A deformation or dynamic factor (N/mm)42-K – A factor depending upon the form of the teeth of a gear43-EP – Young‟s modulus for the material of the pinion in N/mm2EG – Young‟s modulus for the material of the gear in N/mm244-e – Tooth error action in mm45-WS – Static tooth load (N)46-Wd – Dynamic tooth load47-Ww – Maximum or limiting load for wear (N)48-Dp – Pitch circle diameter of the pinion in mm49-Q – Ratio factor50-K – Load stress factor (N/mm2)51- Surface endurance limit (N/mm²) 52- Pressure angle 53-N1 – Motor speed (RPM)54-N2 – Output speed (RPM)55-D2 – Diameter of the roller gear wheel (mm)56-D1 – Diameter of the motor gear wheel (mm)