Models / Calibration square

Calibration square

A 100 mm square with a 20 mm hole, for checking size and kerf. Measure both after cutting. If the square is small and the hole is big, raise $kerf by the difference; if it is the other way round, lower it.

The cut file as the downloads lay it out: 106.2 × 106.2 mm, 1 part on 1 sheet. Rendered by KerfScript 0.2.0 from the source below.

Open in playground calibration-square.kerf SVG DXF

Parts

Part	Qty	Size
part	1	100 × 100 mm

Settings

Setting	Default	Range
`size` Outside of the square	`100`	20 to 300
`hole` Diameter of the hole	`20`	2 to 100
`$kerf`	`0.15`	0 to 0.5

Check cut order, power, speed and material settings in your laser software before cutting. Laser software notes

Source 22 lines

// A 100 mm square with a 20 mm hole, for checking size and kerf.
// Measure both after cutting. If the square is small and the hole is big,
// raise $kerf by the difference; if it is the other way round, lower it.
 
/* [Size] */
// Outside of the square
size = 100; // [20:5:300]
// Diameter of the hole
hole = 20; // [2:1:100]
 
/* [Material] */
$kerf = 0.15; // [0:0.01:0.5]
 
difference() {
  rect(size, center = true);
  circle(d = hole);
}
score() rect(size / 2, center = true);
engrave() {
  translate([0, -size / 2 + 6]) text(str(size, " mm"), size = 4, halign = "center");
  translate([0, hole / 2 + 4]) text(str("hole ", hole, " mm, kerf ", $kerf), size = 3, halign = "center");
}