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Fixed blower_exit_offset() for square blowers with 2 screws.

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Chris Palmer 2022-01-23 09:04:46 +00:00
parent ac7c4403b9
commit f4b9ab961c
2 changed files with 11 additions and 2 deletions
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1
readme.md
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@ -442,6 +442,7 @@ Individual teeth are not drawn, instead they are represented by a lighter colour
<a name="Blowers"></a>
## Blowers
Models of radial blowers.
Note that blower_exit() and blower_exit_offset() are for the inside of the exit for square blowers but the outside for spiral blowers.
[vitamins/blowers.scad](vitamins/blowers.scad) Object definitions.

12
vitamins/blower.scad
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@ -20,6 +20,8 @@
//
//! Models of radial blowers.
//
//! Note that blower_exit() and blower_exit_offset() are for the inside of the exit for square blowers but the outside for spiral blowers.
//
include <../utils/core/core.scad>
use <../utils/rounded_cylinder.scad>
use <../utils/quadrant.scad>
@ -45,8 +47,10 @@ function blower_wall_left(type) = type[15]; //! Left side wall thickness
function blower_wall_right(type) = type[17]; //! Right wall thickness (for square fans)
function blower_casing_is_square(type) = blower_depth(type) < 15; //! True for square radial fans, false for spiral shape radial blowers
function blower_exit_offset(type) = blower_casing_is_square(type) ? blower_length(type) / 2 : blower_exit(type) / 2; //! Offset of exit's centre from the edge
function blower_exit_offset(type) = //! Offset of exit's centre from the edge
blower_casing_is_square(type) ? len(blower_screw_holes(type)) > 2 ? blower_length(type) / 2
: blower_wall_left(type) + blower_exit(type) / 2
: blower_exit(type) / 2;
fan_colour = grey(20);
module blower_fan(type, casing_is_square) {
@ -100,6 +104,7 @@ module blower_square(type) { //! Draw a square blower
// cut out the inside, leaving the corners
translate([hole_count == 2 ? wall_left : corner_inset + wall_left, -eps])
square([blower_exit(type), width / 2], center = false);
translate(blower_axis(type))
circle(d = blower_bore(type) + 1);
} else {
@ -225,6 +230,9 @@ module blower(type) { //! Draw specified blower
blower_fan(type, is_square);
}
*translate([blower_exit(type) / 2 + blower_exit_offset(type), 0])
rotate(180)
#cube([blower_exit(type), 30, depth]);
}
module blower_hole_positions(type) //! Translate children to screw hole positions