Measuring for a curve

Measuring for a curve, like everything else, is simple when you know how. We hope the following guidelines will be of some help.

The main principle to understand is that accuracy is achieved by working/ measuring from point to point.

For example in the sketch below, the blue line and dots represent external point to point dimensions of a panel of glass. i.e chord, radius, depth of bend, and girth. The red line and dots represent the internal dimensions of the same panel of glass.

  • Radius and angle of arc (specify whether int. or ext)
  • Radius and chord
  • Chord and depth of bend

The above holds true once the curve represents a part or segment of a circle. However where the curve is an irregular shape, either elliptical or part curved with part straight, then we would always recommend taking an accurate template of the shape. Of course where templates are being provided, like with measurements it is important to specify what they represent: int. or ext or centre.