# Shaft Calculations

The shaft calculation feature is used to calculate deflection lines, bending moments, torsion moments, and factors of safety for shafts or axles put under static loads. You can also use the shaft calculation to determine the strength of the shaft at selected points on the shaft periphery.

With the shaft calculation feature, you can carry out calculation on any of the following:

Before you can start the calculation, you first must define a sufficient support for the shaft. You can then apply force moments, point loads, line loads, or gear forces to the shaft. The material for the shaft can be selected from the DIN or ANSI standards or specified manually.

When defining loads, you may select the option "Dynamic Loads" in the Shaft Calculation dialog box to specify a minimum and a maximum value for the load and to perform calculation for these two values simultaneously.

*Note: *When performing
the strength calculation (based on DIN 743 or ANSI), the following
assumptions are made:

- When a dynamic type of load is applied to the shaft, the average value of that load is assumed to be null.
- Performing calculation on a rotating axle or on a shaft is carried out in the same way. No torsion moment is considered in case of an axle.
- A constant and an oscillating bending moment can be applied to a stationary axle. No torsion moment is considered here. For security reasons, the shaft calculation feature uses the maximum amplitude of the oscillating bending moment and the value of the constant bending moment for the strength calculation.

You first assign loads and supports to an existing shaft and then perform calculation on that shaft. You can calculate the resultant moments and deflections induced on the whole shaft, or calculate strengths of the shaft at specific points.

- Content
tab Calculation
panel drop-down Shaft
CalculationAt the Command prompt,
enter
*AMSHAFTCALC*. - At the command prompt, choose Create.
Then select the shaft on which you want to perform a shaft calculation,
and press ENTER.
*Note:*If the selected shaft was created with the Shaft Generator, you are prompted to choose whether the contour of the shaft is to be generated. Enter Yes and specify a point in the drawing to insert the generated contour, then proceed to step 4. If you enter No, proceed with step 3. - Select the shaft centerline.
- In the Shaft Calculation dialog box, select the part on which you want to perform the calculation: rotating shaft, rotating axle, or not rotating axle.
- In the Shaft Calculation dialog box, specify the direction of rotation for the shaft.
- In the Shaft Calculation dialog box, choose a type of support. Then select an appropriate point in the drawing to place the support.
- Repeat step 6 to insert additional supports.
- In the Shaft Calculation dialog box, choose the type of load. Then select an appropriate point in the drawing to place the load.
- Repeat step 7 to insert additional loads.
- In the Shaft Calculation dialog box, choose Edit.
- In the Material Properties dialog box choose Table to specify the type of material for the shaft. Then choose twice OK.
- Choose Moments and Deformations.
- In the Select Graph dialog box, make your necessary entries. Then choose OK.
- In the drawing, specify a point to insert the result of calculation.

- Perform steps 1 through 10, as described above.
- In the Shaft Calculation dialog box, choose Strength.
- Specify a point on the shaft, at which you want to calculate the shaft strengths.
- In the Notch tab of the Strength Calculation dialog box, make the necessary changes to the shaft geometry, and click OK.
- In the drawing, specify a point to insert the result of calculation, and press ENTER.

*Note: *S1 and
S2 are the calculated safety factor for the fatigue failure and
the yielding point, respectively.

Calculate deflection lines, bending moments, torsion moments, and factors of safety for shafts and axles put under static loads.

*amshaftcalc*

You can perform the calculation on full or hollow shafts, on shafts with or without notches, and you can determine the strength of the shaft at selected points on the shaft periphery.

A prerequisite for starting the shaft calculation is an already drawn shaft.

Select contour or [Create
contour/Strength]<Create>:* Select a shaft contour
in the drawing, enter C to select the objects that make the shaft
contour, or enter S to start the Strength Calculation.*

Select shaft centerline
or [Pick inner point for hollow shaft] <Pick>: *Select
the shaft centerline.*

The command terminates with the error message “non-symmetric shaft” if the selected objects do not build a rotational symmetric shaft.

Use the Shaft Calculation dialog box to assign loads and supports, specify the direction of rotation, select the type of material for the shaft, and to perform calculation on the selected part of the shaft.

Use the Torque dialog box to define the torque acting on the shaft.

Use the Point Load dialog box to define the radial point forces acting on the shaft.

Use the Line Load dialog box to define the radial line forces acting on the shaft.

Use the Gear dialog box to define the gear load acting on the shaft.

Use the Coupling Gear dialog box to calculate the torque from the power and number of revolution of the coupling gear or from the torsion moment delivered by that coupling gear.

Use the Material dialog box to select a material for the shaft from the selected standard.

*Material Properties dialog
box*

Use the Material Properties dialog box to change properties of the selected material or to choose a new material altogether.

Use the Configuration dialog box to set configuration for moment and deformation calculation.

Use the Select Graph dialog box to calculate bending moments, torsion moments, and stresses in the part (shaft, or axle) you selected.

*Strength Calculation dialog
box*

Use the Strength Calculation dialog box to calculate the strength of the shaft at a point that you specify. The calculation is performed according to the DIN or ANSI standard. The factors of safety guarding against fatigue failure and against yield point are also calculated.

Use the DIN Notches dialog box to select a DIN type of notch for the strength calculation.

Use the ANSI Notches dialog box to select an ANSI type of notch for the strength calculation.

Use the AM:Calculations tab to set preferences for fInite element analysis (FEA), bearing calculations, and shaft calculations.