grey/BOSL2
1
0
Fork 0
mirror of https://github.com/BelfrySCAD/BOSL2.git synced 2025-01-01 09:49:45 +00:00
Code Issues Projects Releases Packages Wiki Activity Actions

Made some saner default values for gears and racks.

Browse source
This commit is contained in:
Revar Desmera 2017-08-30 18:32:20 -07:00
parent 5d62eb7922
commit a9e9956c9b
1 changed files with 14 additions and 11 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

25
involute_gears.scad
View file

@ -109,10 +109,10 @@ function q6(b,s,t,d) = polar(d,s*(iang(b,d)+t));
//a rack, which is a straight line with teeth (the same as a segment from a giant gear with a huge number of teeth).
//The "pitch circle" is a line along the X axis.
module rack (
mm_per_tooth = 3, //this is the "circular pitch", the circumference of the pitch circle divided by the number of teeth
number_of_teeth = 11, //total number of teeth along the rack
thickness = 6, //thickness of rack in mm (affects each tooth)
height = 120, //height of rack in mm, from tooth top to back of rack.
mm_per_tooth = 5, //this is the "circular pitch", the circumference of the pitch circle divided by the number of teeth
number_of_teeth = 20, //total number of teeth along the rack
thickness = 5, //thickness of rack in mm (affects each tooth)
height = 10, //height of rack in mm, from tooth top to back of rack.
pressure_angle = 28, //Controls how straight or bulged the tooth sides are. In degrees.
backlash = 0.0 //gap between two meshing teeth, in the direction along the circumference of the pitch circle
) {
@ -141,13 +141,13 @@ module rack (
//These 5 functions let the user find the derived dimensions of the gear.
//A gear fits within a circle of radius outer_radius, and two gears should have
//their centers separated by the sum of their pictch_radius.
function circular_pitch (mm_per_tooth=3) = mm_per_tooth; //tooth density expressed as "circular pitch" in millimeters
function diametral_pitch (mm_per_tooth=3) = pi / mm_per_tooth; //tooth density expressed as "diametral pitch" in teeth per millimeter
function adendum (mm_per_tooth=3) = module_value(mm_per_tooth);
function dedendum (mm_per_tooth=3) = 1.25 * module_value(mm_per_tooth);
function module_value (mm_per_tooth=3) = mm_per_tooth / pi; //tooth density expressed as "module" or "modulus" in millimeters
function pitch_radius (mm_per_tooth=3,number_of_teeth=11) = mm_per_tooth * number_of_teeth / pi / 2;
function outer_radius (mm_per_tooth=3,number_of_teeth=11,clearance=0.1) //The gear fits entirely within a cylinder of this radius.
function circular_pitch (mm_per_tooth=5) = mm_per_tooth; //tooth density expressed as "circular pitch" in millimeters
function diametral_pitch (mm_per_tooth=5) = pi / mm_per_tooth; //tooth density expressed as "diametral pitch" in teeth per millimeter
function adendum (mm_per_tooth=5) = module_value(mm_per_tooth);
function dedendum (mm_per_tooth=5) = 1.25 * module_value(mm_per_tooth);
function module_value (mm_per_tooth=5) = mm_per_tooth / pi; //tooth density expressed as "module" or "modulus" in millimeters
function pitch_radius (mm_per_tooth=5,number_of_teeth=11) = mm_per_tooth * number_of_teeth / pi / 2;
function outer_radius (mm_per_tooth=5,number_of_teeth=11,clearance=0.1) //The gear fits entirely within a cylinder of this radius.
= mm_per_tooth*(1+number_of_teeth/2)/pi - clearance;
//////////////////////////////////////////////////////////////////////////////////////////////
@ -155,6 +155,7 @@ function outer_radius (mm_per_tooth=3,number_of_teeth=11,clearance=0.1) //
//Try it with OpenSCAD View/Animate command with 20 steps and 24 FPS.
//The gears will continue to be rotated to mesh correctly if you change the number of teeth.
/*
n1 = 11; //red gear number of teeth
n2 = 20; //green gear
n3 = 5; //blue gear
@ -176,6 +177,8 @@ translate([ d13, 0, 0]) rotate([0,0,-($t-n3/4+n1/4+1/2)*360/n3]) color([0.75,0.
translate([ d13, 0, 0]) rotate([0,0,-($t-n3/4+n1/4+1/2)*360/n3]) color([0.75,0.75,1.00]) gear(mm_per_tooth,n3,thickness,hole);
translate([-d14, 0, 0]) rotate([0,0,-($t-n4/4-n1/4+1/2-floor(n4/4)-3)*360/n4]) color([1.00,0.75,0.50]) gear(mm_per_tooth,n4,thickness,hole,0,n4-3);
translate([(-floor(n5/2)-floor(n1/2)+$t+n1/2-1/2)*9, -d1+0.0, 0]) rotate([0,0,0]) color([0.75,0.75,0.75]) rack(mm_per_tooth,n5,thickness,height);
*/
rack();
// vim: noexpandtab tabstop=4 shiftwidth=4 softtabstop=4 nowrap