Custom System of Units

Use the New button on the Systems of Units tab of the Units Manager dialog box to create a custom system of units. You create a custom system of units by combining individual units. You can combine predefined units and custom units to create a custom system of units. For a list of unit values available in Creo Parametric, see Predefined Units.

When choosing a system of units, decide which quantities will form the basic physical dimensions and which quantities will be derived from the basic dimensions. The basic dimensions can be any of the following:

• mass, length, time, angle, and temperature

• force, length, time, angle, and temperature

When you define force or mass as your primary unit, the other becomes a derived unit. For example, if you select force as one of your primary units, mass becomes a derived unit for your model. The connection between these two systems is given by Newton's second law of motion:

force = mass x acceleration

the dimensions of which are: F = ML/T2

When you click the New button, the System of Units Definition dialog box opens. Type a name for the new system of units and use these radio buttons to determine the basic physical dimension type:

• Mass length time (MLT)—Select this radio button if you want your system of units to be based on mass.

• Force length time (FLT)—Select this radio button if you want your system of units to be based on force.

Then, select values for the following units:

• Length

• Mass or Force

• Time

• Temperature

• Angle

Return to Systems of Units Management.