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In the gear module, set rim_thickness, rim_width, hub_thickness, hub_diameter, and bore_diameter default values to undef and

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then added code to calculate default values based on a percentage of the root circle radius.  This helps generate a valid
gear when the only parameter specified is the pitch (diametral or circular).
This commit is contained in:
gizmoplex 2015-12-05 18:57:18 -05:00
parent 2d1a97c307
commit 2a126e526a
1 changed files with 14 additions and 5 deletions
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19
involute_gears.scad
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@ -299,11 +299,11 @@ module gear (
pressure_angle=28,
clearance = undef,
gear_thickness=5,
rim_thickness=8,
rim_width=5,
hub_thickness=10,
hub_diameter=15,
bore_diameter=5,
rim_thickness=undef,
rim_width=undef,
hub_thickness=undef,
hub_diameter=undef,
bore_diameter=undef,
circles=0,
backlash=0,
twist=0,
@ -346,8 +346,17 @@ module gear (
half_thick_angle = (360 / number_of_teeth - backlash_angle) / 4;
// 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;
// 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.
circle_orbit_diameter=hub_diameter/2+rim_radius;
circle_orbit_curcumference=pi*circle_orbit_diameter;