February 2018 – Page 2

February 17, 2018February 17, 2018

KiCad and 3D Models (5)

// dimensions in mm
 
a=7.0;
b=7.0;
c=13.5-(5.8+1.8+3.9);

h1=1.8;
r1=25.4/4/2;

h2=5.8;
r2=r1*0.9;
 
xoff=a/2;
yoff=b/2;
  
nx=2;
ny=2;
gx=5.08;
gy=gx;
k=1.02;
k2=1.25/2;
h=3.9;
 
xoffset=(a-gx*(nx-1)-k2)/2;
yoffset=(b-gy*(ny-1)-k2)/2;
  
cube([a, b, c]);
  
translate([xoff,yoff,c])
        cylinder(h1, r1, r1, false,$fn=13);

difference() {
translate([xoff,yoff,c+h1])
        cylinder(h2, r2, r2, false,$fn=18);

translate([xoff,yoff,c+h1+h2*0.8])
        cylinder(h2*0.3, r2*0.9, r2*0.9, false,$fn=18);
}
 
for (x=[0:nx-1]) {
    for (y=[0:ny-1]) {
    translate([xoffset+gx*x,yoffset+gy*y,-h])
        cube([k, k, h]);
    }
}

translate([xoff, yoff, -h])
cylinder(h, k2, k2, false, $fn=20);

February 16, 2018February 16, 2018

KiCad and 3D Models (4)

Here is a toggle switch.

Not very exact, but may suffice for my purposes.

// dimensions in inches

a=0.450;
b=0.500;
c=0.3350+0.060;
h1=0.350;
h2=0.410;
r1=0.25/2;
r2=0.115/2;

xoff=a/2;
yoff=b/2;
 
nx=2;
ny=3;
gx=0.190;
gy=0.185;
k=0.073/2;
h=0.201;

xoffset=(a-gx*(nx-1))/2;
yoffset=(b-gy*(ny-1))/2;
 
cube([a, b, c]);
 
translate([xoff,yoff,c])
        cylinder(h1, r1, r1, false,$fn=16);

translate([xoff,yoff,c+h1*0.9]) {
        rotate(30,[1,0,0])
        cylinder(h2, r2, r2, false,$fn=10);
 
}

for (x=[0:nx-1]) {
    for (y=[0:ny-1]) {
    translate([xoffset+gx*x,yoffset+gy*y,-h])
        cylinder(h, k, k, false);
    }
}

February 15, 2018February 16, 2018

KiCad and 3D Models (3)

Designing a 3D model is much easier with OpenSCAD rather than, say, FreeCAD.

Here is TAK-5 Frequency Mixer with which you wish to make a model.

Just copy some of the physical parameters into your source code, and then write a very short program.

Voilà!

// dimensions in inches
b=0.800;a
d=0.210;
f=0.400;
g=0.200;
h=0.20;
k=0.031;
nx=2;
ny=4;
xoffset=(f-g*(nx-1))/2;
yoffset=(b-g*(ny-1))/2;

cube([f,b,d]);

for (x=[0:nx-1]) {
    for (y=[0:ny-1]) {
    translate([xoffset+g*x,yoffset+g*y,-h])
        cylinder(h, k, k, false);
    }
}

February 14, 2018