--- /dev/null
+// OpenSCAD Herringbone Wade's Gears Script
+// (c) 2011, Christopher "ScribbleJ" Jansen
+//
+// Thanks to Greg Frost for his great "Involute Gears" script.
+//
+// Licensed under the BSD license.
+//
+// Adapted for Reprap Wilson by Martin Rice
+//
+
+include <MCAD/involute_gears.scad>
+
+
+// WHAT TO GENERATE?
+generate = 0; // GENERATE BOTH GEARS FOR VIEWING
+// generate = 1; // GENERATE STEPPER GEAR FOR PRINTING
+ generate = 2; // GENERATE DRIVE GEAR FOR PRINTING
+
+// OPTIONS COMMON TO BOTH GEARS:
+distance_between_axels = 42;
+gear_h = 10;
+
+// for big
+gear_shaft_h = 5;
+
+// for small
+//gear_shaft_h = 10;
+
+
+// GEAR1 (SMALLER GEAR, STEPPER GEAR) OPTIONS:
+// It's helpful to choose prime numbers for the gear teeth.
+gear1_teeth = 13;
+gear1_shaft_d = 5.25; // diameter of motor shaft
+gear1_shaft_r = gear1_shaft_d/2;
+// gear1 shaft assumed to fill entire gear.
+// gear1 attaches by means of a captive nut and bolt (or actual setscrew)
+gear1_setscrew_offset = 5; // Distance from motor on motor shaft.
+gear1_setscrew_d = 3.5;
+gear1_setscrew_r = gear1_setscrew_d/2;
+gear1_captive_nut_d = 6.2;
+gear1_captive_nut_r = gear1_captive_nut_d/2;
+gear1_captive_nut_h = 2.9;
+
+
+// GEAR2 (LARGER GEAR, DRIVE SHAFT GEAR) OPTIONS:
+gear2_teeth = 37;
+gear2_shaft_d = 8.5;
+gear2_shaft_r = gear2_shaft_d/2;
+// gear2 has settable outer shaft diameter.
+gear2_shaft_outer_d = 16;
+gear2_shaft_outer_r = gear2_shaft_outer_d/2;
+
+// gear2 has a hex bolt set in it, is either a hobbed bolt or has the nifty hobbed gear from MBI on it.
+gear2_bolt_hex_d = 15;
+gear2_bolt_hex_r = gear2_bolt_hex_d/2;
+// gear2_bolt_sink: How far down the gear shaft the bolt head sits; measured as distance from drive end of gear.
+gear2_bolt_sink = 5;
+// gear2's shaft is a bridge above the hex bolt shaft; this creates 1/3bridge_helper_h sized steps at top of shaft to help bridging. (so bridge_helper_h/3 should be > layer height to have any effect)
+bridge_helper_h=1;
+
+gear2_rim_margin = 3;
+gear2_cut_circles = 5;
+
+// gear2 setscrew option; not likely needed.
+gear2_setscrew_offset = 0;
+gear2_setscrew_d = 0;
+gear2_setscrew_r = gear2_setscrew_d/2;
+// captive nut for the setscrew
+gear2_captive_nut_d = 0;
+gear2_captive_nut_r = gear2_captive_nut_d/2;
+gear2_captive_nut_h = 0;
+
+
+// Tolerances for geometry connections.
+AT=0.02;
+ST=AT*2;
+TT=AT/2;
+
+
+module bridge_helper()
+{
+ difference()
+ {
+ translate([0,0,-bridge_helper_h/2])
+ cylinder(r=gear2_bolt_hex_r+TT, h=bridge_helper_h+TT,$fn=6,center=true);
+ #translate([0,0,-bridge_helper_h/2])
+ cube([gear2_bolt_hex_d+ST, gear2_shaft_d, bridge_helper_h+AT], center=true);
+ }
+}
+
+
+
+module gearsbyteethanddistance(t1=13,t2=51, d=60, teethtwist=1, which=1)
+{
+ cp = 360*d/(t1+t2);
+
+ g1twist = 360 * teethtwist / t1 / 2;
+ g2twist = 360 * teethtwist / t2 / 2;
+
+ g1p_d = t1 * cp / 180;
+ g2p_d = t2 * cp / 180;
+ g1p_r = g1p_d/2;
+ g2p_r = g2p_d/2;
+
+ echo(str("Your small ", t1, "-toothed gear will be ", g1p_d, "mm across (plus 1 gear tooth size) (PR=", g1p_r,")"));
+ echo(str("Your large ", t2, "-toothed gear will be ", g2p_d, "mm across (plus 1 gear tooth size) (PR=", g2p_r,")"));
+ echo(str("Your minimum drive bolt length (to end of gear) is: ", gear2_bolt_sink+bridge_helper_h, "mm and your max is: ", gear_h+gear_shaft_h, "mm."));
+ echo(str("Your gear mount axles should be ", d,"mm (", g1p_r+g2p_r,"mm calculated) from each other."));
+ if(which == 1)
+ {
+ // GEAR 1
+ difference()
+ {
+ union()
+ {
+ translate([0,0,(gear_h/2) - TT])
+ gear( twist = g1twist,
+ number_of_teeth=t1,
+ circular_pitch=cp,
+ gear_thickness = gear_shaft_h + (gear_h/2)+AT,
+ rim_thickness = (gear_h/2)+AT,
+ rim_width = 0,
+ hub_thickness = (gear_h/2)+AT,
+ hub_width = 0,
+ bore_diameter=0);
+
+ translate([0,0,(gear_h/2) + AT])
+ rotate([180,0,0])
+ gear( twist = -g1twist,
+ number_of_teeth=t1,
+ circular_pitch=cp,
+ gear_thickness = (gear_h/2)+AT,
+ rim_thickness = (gear_h/2)+AT,
+ hub_thickness = (gear_h/2)+AT,
+ bore_diameter=0);
+ }
+ //DIFFERENCE:
+ //shafthole
+ translate([0,0,-TT])
+ cylinder(r=gear1_shaft_r, h=gear_h+gear_shaft_h+ST);
+
+ //setscrew shaft
+ translate([0,0,gear_h+gear_shaft_h-gear1_setscrew_offset])
+ rotate([0,90,0])
+ cylinder(r=gear1_setscrew_r, h=g1p_r);
+
+ //setscrew captive nut
+ translate([(g1p_r)/2, 0, gear_h+gear_shaft_h-gear1_captive_nut_r-gear1_setscrew_offset])
+ translate([0,0,(gear1_captive_nut_r+gear1_setscrew_offset)/2])
+ #cube([gear1_captive_nut_h, gear1_captive_nut_d, gear1_captive_nut_r+gear1_setscrew_offset+ST],center=true);
+
+
+ }
+ }
+ else
+ {
+ // GEAR 2
+ difference()
+ {
+ union()
+ {
+ // cylinder(h=gear_h+gear_shaft_h , r=gear2_shaft_outer_r);
+
+ translate([0,0,(gear_h/2) - TT])
+ gear( twist = -g2twist,
+ number_of_teeth=t2,
+ circular_pitch=cp,
+ gear_thickness = gear_shaft_h + (gear_h/2)+AT,
+ rim_thickness = (gear_h/2)+AT,
+ rim_width = gear2_rim_margin,
+ hub_diameter = gear2_shaft_outer_d,
+ hub_thickness = (gear_h/2)+AT,
+ bore_diameter=0,
+ circles = gear2_cut_circles);
+
+ translate([0,0,(gear_h/2) + AT])
+ rotate([180,0,0])
+ gear( twist = g2twist,
+ number_of_teeth=t2,
+ circular_pitch=cp,
+ gear_thickness = (gear_h/2)+AT,
+ rim_thickness = (gear_h/2)+AT,
+ rim_width = gear2_rim_margin,
+ hub_diameter = gear2_shaft_outer_d,
+ hub_thickness = (gear_h/2)+AT,
+ bore_diameter=0,
+ circles = gear2_cut_circles);
+ }
+
+ //DIFFERENCE:
+ //shafthole
+ translate([0,0,-TT])
+ cylinder(r=gear2_shaft_r, h=gear_h+gear_shaft_h+ST);
+
+ //setscrew shaft
+if(0) {
+ translate([0,0,gear_h+gear_shaft_h-gear2_setscrew_offset])
+ rotate([0,90,0])
+ cylinder(r=gear2_setscrew_r, h=gear2_shaft_outer_d);
+
+ //setscrew captive nut
+ translate([(gear2_shaft_outer_d)/2, 0, gear_h+gear_shaft_h-gear2_captive_nut_r-gear2_setscrew_offset])
+ translate([0,0,(gear2_captive_nut_r+gear2_setscrew_offset)/2])
+ #cube([gear2_captive_nut_h, gear2_captive_nut_d, gear2_captive_nut_r+gear2_setscrew_offset+ST],center=true);
+}
+
+ //trim shaft
+ difference()
+ {
+ translate([0,0,gear_h+AT]) cylinder(h=gear_shaft_h+ST, r=g2p_r);
+ #translate([0,0,gear_h]) cylinder(h=gear_shaft_h , r=gear2_shaft_outer_r);
+ }
+
+ //hex bolt shaft
+ translate([0,0,-TT]) cylinder(r=gear2_bolt_hex_r, h=gear2_bolt_sink+AT,$fn=6);
+
+ }
+
+if(1) translate([0,0,1]) {
+ // hex bolt shaft bridge aid.
+ #translate([0,0,gear2_bolt_sink]) //gear_h+gear_shaft_h-gear2_bolt_sink])
+ bridge_helper();
+ #translate([0,0,gear2_bolt_sink-bridge_helper_h/3]) //gear_h+gear_shaft_h-gear2_bolt_sink+bridge_helper_h/3])
+ rotate([0,0,60]) bridge_helper();
+ #translate([0,0,gear2_bolt_sink-(bridge_helper_h/3*2)]) //gear_h+gear_shaft_h-gear2_bolt_sink+((bridge_helper_h/3)*2)])
+ rotate([0,0,-60]) bridge_helper();
+ }
+ }
+
+}
+
+
+t1 = gear1_teeth;
+t2 = gear2_teeth;
+cp = 360*distance_between_axels/(t1+t2);
+g1p_d = t1 * cp / 180;
+g2p_d = t2 * cp / 180;
+g1p_r = g1p_d/2;
+g2p_r = g2p_d/2;
+
+if(generate == 1)
+{
+ gearsbyteethanddistance(t1 = gear1_teeth, t2=gear2_teeth, d=distance_between_axels, which=1);
+}
+else if(generate == 2)
+{
+ gearsbyteethanddistance(t1 = gear1_teeth, t2=gear2_teeth, d=distance_between_axels, which=2);
+}
+else
+{
+
+ translate([-g1p_r,0,0]) rotate([0,0,($t*360/gear1_teeth)]) gearsbyteethanddistance(t1 = gear1_teeth, t2=gear2_teeth, d=distance_between_axels, which=1);
+ translate([g2p_r,0,0]) rotate([0,0,($t*360/gear2_teeth)*-1]) gearsbyteethanddistance(t1 = gear1_teeth, t2=gear2_teeth, d=distance_between_axels, which=2);
+}
+
HCoop / clinton / wilson.git / blobdiff