Standard Holes

Standard holes are identified by a hole type (string), followed by a variable number of parameters, separated by asterisks (for example, HO600*400 for a manhole).

Circular Hole (D)

Designation: D <d>

Example: D250

Oval Hole (HO)

Designation: HO <a>*<b> (a>b)

Example: HO600*400

Asymmetrical Hole (HOR)

Designation: HOR <a> *< r1 >*< r2>

Example: HOR600*200*100

Elliptical Hole (HE)

Designation: HOR <a> *< r1 >*< r2>

Example: HOR600*200*100

Superelliptical Hole (HSE)

Designation: HSE <a> *<b> * <e>

Example: HSE1200*600*2.5

Here e is the exponent of the “super ellipse” equation:

(x/a) ** e + (y/b) ** e = 1

e = 2.5 results in a “super ellipse”

e = 2 results in “normal” ellipse, closer to the mathematical ellipse than the HE hole

Elliptical-Rectangular Hole (HER)

Designation: HER <c> *<d> * <a> * <b>

Example: HER2100*950*1500*950

This is an elliptical hole where rectangular "strips" have been inserted around the symmetry axes.

Rectangular Hole (HR)

Designation: HR <a> *<b> * <r>

Example: HR1480*680*40

Hole with "Mickey Mouse Ears" (HRM)

Designation: HRM <a> *<b> * <r> [*<d>]

Example: HRM2000*700*50*10

If <d> is left out the corner arc passes through the sharp corner of the rectangle, i.e. d=0.

Triangular Hole (HT)

Designation: HT <a> *<b> * <r1> [*<r2>[*<r3>]]

Example: HT600*600*75

If r2 and r3 are left out: r2 = r3 = r1.

If only r3 is left out: r3 = r2.

The reference point of this hole is in the intersection point between the lines along edges "a" and "b".