# Mechanics solve problem:Just the correct answer

**Question description**

Convert the load to 3000 Ibs

Convert 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 bellow

1-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 screw

6-α - Helix angle of screw (degree)

7-W - Load (kg)

8-N - Normal reaction

9-μ - Coefficient of friction

10-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 section

29-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 stress

34-y - Lewis form factor

35-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 gear

43-EP - Young‟s modulus for the material of the pinion in N/mm2EG - Young‟s modulus for the material of the gear in N/mm2

44-e - Tooth error action in mm

45-WS - Static tooth load (N)

46-Wd - Dynamic tooth load

47-Ww - Maximum or limiting load for wear (N)

48-Dp - Pitch circle diameter of the pinion in mm

49-Q - Ratio factor

50-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)

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