Calculates elastic cylindrical co-axial pressure connections for compact or hollow shafts in either hot or cold state. The program calculates geometric parameters of the joint, minimal fit, standard or actual fit, and pressed-on parts material selection.
This calculation is only valid for connections that are not loaded by outside pressure or are made from tubular parts with unlimited length. The parts are made from materials that behave according to Hooke's law.
A press fit joint with unlimited length is a joint with the length that equals the diameter or greater. If it is shorter, the real contact pressure is greater than calculated. This calculation provides more safety against the press fit loosing.
Calculated temperatures must be considered as minimum, because they do not consider temperature averaging during the pressing process, nor the hub cooling time after pulling it from the furnace, for example.
Sets parameters for calculation of a press fit.
Enter values for required transferred loading.
Performs a calculation according to required torque.
Performs a calculation according to required force.
Maximum torque required to transfer between shaft and hub.
Axial force required to transfer between shaft and hub.
Enter the value of safety factor. This value is multiplied with force or torque and in fact describes size of over design. Use higher number than 1.0 specially if non-static load is applied.
Enter dimensions for press fit. If you enter values that do not correspond with other dimensions, the values are displayed in red.
Enter outer diameter of the hub.
External shaft diameter in place of contact.
Internal shaft diameter of hollow shaft. If solid shaft is considered use 0.0.
Enter length of pressure connection.
This part of the panel is used to find standard fit for shaft and hub.
Standard hub and shaft fit that is calculated based on ISO or ANSI standard.
Opens the Limits and Fits Mechanical Calculator - Interference Fit dialog box. You can adjust the maximum and minimum interference. Click OK to return to the Calculation tab.
If the corresponding standard fit for the calculated maximum possible and minimum possible interference cannot be found, the limit deviations are calculated and numerically expressed. In the tolerance field, you can adapt the limit deviations. You cannot exceed maximum possible or minimum possible interference. If so, the calculated interferences are shown in red and display an error message. To adapt limit deviations, clear the check box for the Specify manually option in the Fundamental Deviations box.
Assembly clearance is an important dimension for the shaft cooling temperature calculation and hub warming. You can specify the dimension only when the Assembly Clearance check box is selected.
Surface quality affects the size of the trueing at contact surfaces and the size of efficient interference. Trueing is not applied to perfectly smooth surfaces. For smooth surfaces, the efficient interference equals the minimum interference and the maximum loading capacity. The Surface Smoothness fields for editing surface quality are only available when you select the Surface Smoothness check box. If you clear the check box, you can specify the value of trueing. The surface quality value is not used in the calculation.
The calculation contains a table of minimum values for the steel parts clamping coefficient. Click the arrow on the Clamping Factor box to open the Clamping Factor table.
Clamping Factor (pressing)
Applies this factor for connections manufactured (connected) in the cold state. Pressing force affects the assembly shaft and hub.
Limitation of Hub Warming Up
Sets limitations for hub warming up.
Limitation of Shaft Cooling
Sets limitations for shaft cooling.
Hub Warming Up
Specifies the minimum warming up temperature for the hub if the connection is assembled in the hot state.
Specifies the base temperature of the surroundings environment.
Specifies the minimum cooling temperature of the shaft if the connection is assembled in the hot state.
Displays the reports about calculations. To open the Summary of Messages area at the bottom of the tab, double-click the double line at the bottom of tabs or click the chevron.