Here's the program that generates the bracket.
This is an scad format program (OpenSCAD)
Generates .scad files, and then exports .stl files
works well with notepad++
You may have to consider where the editor (or your email program) has
put in the carriage returns
.*****************************************************
// parametric support bracket
// overall thickness 7.42 mm (0.29 inches)
// spacing between holes set by board_offset
// allows 3/4 inch (arbitrary) mounting hole space
// drill mounting holes for bracket for 4-40 screws with 0.25 inch
nuts
// tap hex posts for 4-40 for board
// user set parameters
board_offset_inches = 2.95;
board_hole_to_edge_inches = 0.3;
// derived or fixed parameters
$fn = 100;
board_to_edge = board_hole_to_edge_inches * 25.4;
board_offset = board_offset_inches * 25.4; //
board hole spacing
board_hole = 1.35; // tap for 4-40 later
post_size = 6.1; // 0.25 inches
post_thick = 1.2 * post_size; // offset post size to
accommodate nut
support_height = 25.4; // height (below zero) of support
bracket
nut_size_inches = 0.25; // 0.25
nut_size = nut_size_inches * 25.4 * 1.2;
nut_inset = 2; // inset nut this far into
post
angle =
atan(((support_height-post_size)/(board_offset+board_to_edge)));
mount_hole_space = -(support_height+post_size) + 25.4 *3/4;
module post()
{
difference ()
{
union ()
{
translate([post_size/2, post_size/2,0 ])
rotate([0,0,30])cylinder(d = post_size * 1.155, h = 12.5,$fn=6);
}
translate([post_size/2, post_size/2, -1.5])cylinder(r
= board_hole, h=15);
}
}
module arm()
// mounting holes
{difference()
{
union(){
// extension below zero for bracket
translate([0,0,-(support_height+post_thick+nut_size)])
cube([post_thick, post_size, support_height+post_size + nut_size]);
// arm brace
translate([0,0,-support_height])rotate
([angle,0,0]) cube([post_size, board_offset+2*post_size+board_to_edge,
post_size]);
// horizontal support arm
translate([0,0,-post_size/2]) cube([post_size,
board_offset+post_size+board_to_edge, post_size]);
}
// cuts off far end
translate([-(post_thick-post_size)/2,board_offset+post_size+board_to_edge,-3.5
*post_size]) cube([2* post_thick, 2* post_size, 4* post_size]);
// cuts off near end
translate([-(post_thick-post_size)/2,-2*post_size,-support_height])
cube([2* post_thick, 2* post_size, 4* post_size]);
// hole for screw #1
translate([post_thick/2, -post_size/2,
-support_height-post_size])rotate([-90,0,0])cylinder(r = board_hole,
h=15);
// hole for hex nut #1
translate([post_thick/2, post_size-nut_inset,
-support_height-post_size ]) rotate([0,90,90])cylinder(d = nut_size, h
= 2*nut_inset,$fn=6);
// hole for screw #1
translate([post_thick/2, -post_size/2,
mount_hole_space])rotate([-90,0,0])cylinder(r = board_hole, h=15);
// hole for hex nut #2
translate([post_thick/2, post_size-nut_inset,
mount_hole_space ]) rotate([0,90,90])cylinder(d = nut_size, h =
2*nut_inset,$fn=6);
}
}
module support()
{
// post nearest mounting arm
translate([0,board_to_edge,0])post();
// post furthest from mounting arm
translate([0,board_to_edge+board_offset,0]) post();
// mounting bracket minus posts
arm();
}
color("green") support();
.*****************************************************
Harvey
------------------------------------
Posted by: Harvey White <madyn@dragonworks.info>
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