Look for manufacturers of knobs. Also, look on old radios (amateur and otherwise), and test equipment for interesting knobs.
I like Raytheon knobs (among others). Here's Openscad code for a larger one that I measured and wrote this to reproduce. With Openscad you can make an STL file of this and 3d print it:
I like Raytheon knobs (among others). Here's Openscad code for a larger one that I measured and wrote this to reproduce. With Openscad you can make an STL file of this and 3d print it:
Code:
// Big Raytheon knob.
// Ben Bradley June 14, 02018
$fn = 256;
inch_to_mm_scale = 25.4;
height = 2;
outer_skirt_radius = 2.438 / 2;
inner_skirt_radius = 1.670 / 2;
skirt_thickness = 0.060;
skirt_offset = 0.110;
neck_heigth = 0.080;
ribs_heigth = 0.635;
ribs_inner_radius = 0.8655;
top_radius = 0.8017;
top_first_heigth = 0.0165;
top_last_heigth = 0.1805;
// distance 0.81
// 0.1805 - 0.0165 = 0.164;
// 0.164 / 0.81 = 11 degrees
cube_heigth = 0.5;
under_heigth = 0.353;
under_radius = 1.4565 / 2;
rib_radius = 0.030;
number_of_ribs = 60;
rib_radius_inset = 0.01;
rib_surround_radius = ribs_inner_radius - rib_radius_inset;
module ribs (ribs_heigth, rib_radius, rib_surround_radius, number_of_ribs)
{
for (i_angle = [0:360/number_of_ribs:359])
{
rotate([0,0,i_angle])
translate([0,rib_surround_radius,0])
cylinder (ribs_heigth, r = rib_radius, center = false);
}
} // module ribs (ribs_heigth, rib_radius, rib_surround_radius, number_of_ribs)
module slant_top()
{
rotate ([11, 0, 0])
translate ([-outer_skirt_radius, -outer_skirt_radius, skirt_offset + skirt_thickness + neck_heigth + ribs_heigth + top_last_heigth])
cube ([outer_skirt_radius * 2, outer_skirt_radius * 2, cube_heigth]);
rotate ([-11, 0, 0])
translate ([-outer_skirt_radius, -outer_skirt_radius, skirt_offset + skirt_thickness + neck_heigth + ribs_heigth + top_last_heigth])
cube ([outer_skirt_radius * 2, outer_skirt_radius * 2, cube_heigth]);
} // module slant_top()
module body()
{
difference ()
{
union ()
{
cylinder (skirt_thickness, r = outer_skirt_radius, center = false);
translate ([0, 0, skirt_thickness])
cylinder (skirt_offset, r1 = outer_skirt_radius, r2 = inner_skirt_radius, center = false);
translate ([0, 0, skirt_offset + skirt_thickness])
cylinder (neck_heigth, r = inner_skirt_radius, center = false);
translate ([0, 0, skirt_offset + skirt_thickness + neck_heigth])
cylinder (ribs_heigth, r = ribs_inner_radius, center = false);
translate ([0, 0, skirt_offset + skirt_thickness + neck_heigth])
ribs (ribs_heigth, rib_radius, rib_surround_radius, number_of_ribs);
translate ([0, 0, skirt_offset + skirt_thickness + neck_heigth + ribs_heigth])
cylinder (top_first_heigth + top_last_heigth + 0.005, r = top_radius, center = false);
} // union ()
slant_top();
cylinder (under_heigth, r = under_radius, center = false);
} // difference ()
} // module body()
module draw_to_scale (n)
{
scale ([n, n, n])
body();
} // module draw_to_scale (n)
draw_to_scale (inch_to_mm_scale);We call that knurling.
jeff
Yes, I like knurling . . . as long as it's not gnarly knurling.
Yes me too but the surplus supply became touch and go.
When some are located they are expensive.
Thanks for the cad file.
To restore or repair the knob's white fill use Brownells sticks.
I've used them to correct poor application on some RCA mixer knob reproductions.
Comes in white,red,gold and black.
LACQUER-STIK ? LACQUER-STIK(R) | Brownells
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I have a pun generator. It's a machine fitted with a drawcord. If I want a chicken pun I just 'pullet'!
Since 'The' knob is in front of pecking order, hen ce asking, what alb u men think about sleek version ?
An externally hosted image should be here but it was not working when we last tested it.
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