kaan/MCAD-Library
1
0
Fork 0
Code Issues Pull requests Packages Projects Releases Wiki Activity

Merge branch 'devel'

Browse source 
Made some corrections and several updates to default values in the gear module.
This commit is contained in:
gizmoplex 2015-12-05 19:01:53 -05:00
parent 5ff8ce964c 2a126e526a
commit caa5acfb4c
1 changed files with 32 additions and 19 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

51
involute_gears.scad
View file

@ -295,31 +295,35 @@ module involute_bevel_gear_tooth (
module gear ( module gear (
number_of_teeth=15, number_of_teeth=15,
circular_pitch=false, diametral_pitch=false, circular_pitch=undef, diametral_pitch=undef,
pressure_angle=28, pressure_angle=28,
clearance = 0.2, clearance = undef,
gear_thickness=5, gear_thickness=5,
rim_thickness=8, rim_thickness=undef,
rim_width=5, rim_width=undef,
hub_thickness=10, hub_thickness=undef,
hub_diameter=15, hub_diameter=undef,
bore_diameter=5, bore_diameter=undef,
circles=0, circles=0,
backlash=0, backlash=0,
twist=0, twist=0,
involute_facets=0, involute_facets=0,
flat=false) flat=false)
{ {
if (circular_pitch==false && diametral_pitch==false) // Check for undefined circular pitch (happens when neither circular_pitch or diametral_pitch are specified)
if (circular_pitch==undef)
echo("MCAD ERROR: gear module needs either a diametral_pitch or circular_pitch"); echo("MCAD ERROR: gear module needs either a diametral_pitch or circular_pitch");
//Convert diametrial pitch to our native circular pitch //Convert diametrial pitch to our native circular pitch
circular_pitch = (circular_pitch!=false?circular_pitch:180/diametral_pitch); circular_pitch = (circular_pitch!=undef?circular_pitch:pi/diametral_pitch);
// Calculate default clearance if not specified
clearance = (clearance!=undef?clearance:0.25 * circular_pitch / pi);
// Pitch diameter: Diameter of pitch circle. // Pitch diameter: Diameter of pitch circle.
pitch_diameter = number_of_teeth * circular_pitch / 180; pitch_diameter = number_of_teeth * circular_pitch / pi;
pitch_radius = pitch_diameter/2; pitch_radius = pitch_diameter/2;
echo ("Teeth:", number_of_teeth, " Pitch radius:", pitch_radius); echo (str("Teeth: ", number_of_teeth, ", Pitch Radius: ", pitch_radius, ", Clearance: ", clearance));
// Base Circle // Base Circle
base_radius = pitch_radius*cos(pressure_angle); base_radius = pitch_radius*cos(pressure_angle);
@ -342,7 +346,16 @@ module gear (
half_thick_angle = (360 / number_of_teeth - backlash_angle) / 4; half_thick_angle = (360 / number_of_teeth - backlash_angle) / 4;
// Variables controlling the rim. // Variables controlling the rim.
rim_thickness = (rim_thickness!=undef?(rim_thickness!=0?rim_thickness:gear_thickness):gear_thickness * 1.5);
rim_width = (rim_width!=undef?rim_width:root_radius * .1);
rim_radius = root_radius - rim_width; rim_radius = root_radius - rim_width;
// Variables controlling the hub_diameter
hub_thickness = (hub_thickness!=undef?(hub_thickness!=0?hub_thickness:gear_thickness):gear_thickness * 2);
hub_diameter = (hub_diameter!=undef?hub_diameter:root_radius * .3);
// Variables controlling the bore
bore_diameter = (bore_diameter!=undef?bore_diameter:root_radius * .1);
// Variables controlling the circular holes in the gear. // Variables controlling the circular holes in the gear.
circle_orbit_diameter=hub_diameter/2+rim_radius; circle_orbit_diameter=hub_diameter/2+rim_radius;
@ -360,7 +373,7 @@ module gear (
{ {
difference () difference ()
{ {
linear_exturde_flat_option(flat=flat, height=rim_thickness, convexity=10, twist=twist) linear_extrude_flat_option(flat=flat, height=rim_thickness, convexity=10, twist=twist)
gear_shape ( gear_shape (
number_of_teeth, number_of_teeth,
pitch_radius = pitch_radius, pitch_radius = pitch_radius,
@ -375,36 +388,36 @@ module gear (
cylinder (r=rim_radius,h=rim_thickness-gear_thickness+1); cylinder (r=rim_radius,h=rim_thickness-gear_thickness+1);
} }
if (gear_thickness > rim_thickness) if (gear_thickness > rim_thickness)
linear_exturde_flat_option(flat=flat, height=gear_thickness) linear_extrude_flat_option(flat=flat, height=gear_thickness)
circle (r=rim_radius); circle (r=rim_radius);
if (flat == false && hub_thickness > gear_thickness) if (flat == false && hub_thickness > gear_thickness)
translate ([0,0,gear_thickness]) translate ([0,0,gear_thickness])
linear_exturde_flat_option(flat=flat, height=hub_thickness-gear_thickness) linear_extrude_flat_option(flat=flat, height=hub_thickness-gear_thickness)
circle (r=hub_diameter/2); circle (r=hub_diameter/2);
} }
translate ([0,0,-1]) translate ([0,0,-1])
linear_exturde_flat_option(flat =flat, height=2+max(rim_thickness,hub_thickness,gear_thickness)) linear_extrude_flat_option(flat =flat, height=2+max(rim_thickness,hub_thickness,gear_thickness))
circle (r=bore_diameter/2); circle (r=bore_diameter/2);
if (circles>0) if (circles>0)
{ {
for(i=[0:circles-1]) for(i=[0:circles-1])
rotate([0,0,i*360/circles]) rotate([0,0,i*360/circles])
translate([circle_orbit_diameter/2,0,-1]) translate([circle_orbit_diameter/2,0,-1])
linear_exturde_flat_option(flat =flat, height=max(gear_thickness,rim_thickness)+3) linear_extrude_flat_option(flat =flat, height=max(gear_thickness,rim_thickness)+3)
circle(r=circle_diameter/2); circle(r=circle_diameter/2);
} }
} }
} }
module linear_exturde_flat_option(flat =false, height = 10, center = false, convexity = 2, twist = 0) module linear_extrude_flat_option(flat =false, height = 10, center = false, convexity = 2, twist = 0)
{ {
if(flat==false) if(flat==false)
{ {
linear_extrude(height = height, center = center, convexity = convexity, twist= twist) child(0); linear_extrude(height = height, center = center, convexity = convexity, twist= twist) children(0);
} }
else else
{ {
child(0); children(0);
} }
} }