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// OpenSCAD Herringbone Wade's Gears Script |
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// (c) 2011, Christopher "ScribbleJ" Jansen |
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// |
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// Thanks to Greg Frost for his great "Involute Gears" script. |
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// |
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// Licensed under the BSD license. |
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include <MCAD/involute_gears.scad> |
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// WHAT TO GENERATE? |
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//generate = 0; // GENERATE BOTH GEARS FOR VIEWING |
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generate = 0; // GENERATE STEPPER GEAR FOR PRINTING |
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// generate = 2; // GENERATE DRIVE GEAR FOR PRINTING |
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// OPTIONS COMMON TO BOTH GEARS: |
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distance_between_axels = 60; |
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gear_h = 10; |
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gear_shaft_h = 6; |
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// GEAR1 (SMALLER GEAR, STEPPER GEAR) OPTIONS: |
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// It's helpful to choose prime numbers for the gear teeth. |
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gear1_teeth = 13; |
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gear1_shaft_d = 5.5; // diameter of motor shaft |
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gear1_shaft_r = gear1_shaft_d/2; |
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// gear1 shaft assumed to fill entire gear. |
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// gear1 attaches by means of a captive nut and bolt (or actual setscrew) |
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gear1_setscrew_offset = 5; // Distance from motor on motor shaft. |
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gear1_setscrew_d = 3.5; |
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gear1_setscrew_r = gear1_setscrew_d/2; |
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gear1_captive_nut_d = 6.2; |
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gear1_captive_nut_r = gear1_captive_nut_d/2; |
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gear1_captive_nut_h = 3; |
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// GEAR2 (LARGER GEAR, DRIVE SHAFT GEAR) OPTIONS: |
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gear2_teeth = 51; |
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gear2_shaft_d = 8; |
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gear2_shaft_r = gear2_shaft_d/2; |
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// gear2 has settable outer shaft diameter. |
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gear2_shaft_outer_d = 18; |
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gear2_shaft_outer_r = gear2_shaft_outer_d/2; |
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// gear2 has a hex bolt set in it, is either a hobbed bolt or has the nifty hobbed gear from MBI on it. |
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gear2_bolt_hex_d = 15; |
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gear2_bolt_hex_r = gear2_bolt_hex_d/2; |
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// gear2_bolt_sink: How far down the gear shaft the bolt head sits; measured as distance from drive end of gear. |
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gear2_bolt_sink = 3; |
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// 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) |
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bridge_helper_h=3; |
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gear2_rim_margin = 0; |
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gear2_cut_circles = 5; |
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// gear2 setscrew option; not likely needed. |
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gear2_setscrew_offset = 0; |
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gear2_setscrew_d = 0; |
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gear2_setscrew_r = gear2_setscrew_d/2; |
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// captive nut for the setscrew |
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gear2_captive_nut_d = 0; |
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gear2_captive_nut_r = gear2_captive_nut_d/2; |
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gear2_captive_nut_h = 0; |
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// Tolerances for geometry connections. |
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AT=0.02; |
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ST=AT*2; |
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TT=AT/2; |
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module bridge_helper() |
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{ |
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difference() |
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{ |
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translate([0,0,-bridge_helper_h/2]) |
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cylinder(r=gear2_bolt_hex_r+TT, h=bridge_helper_h+TT,$fn=6,center=true); |
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translate([0,0,-bridge_helper_h/2]) |
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cube([gear2_bolt_hex_d+ST, gear2_shaft_d, bridge_helper_h+AT], center=true); |
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} |
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} |
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module gearsbyteethanddistance(t1=13,t2=51, d=60, teethtwist=1, which=1) |
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{ |
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cp = 360*d/(t1+t2); |
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g1twist = 360 * teethtwist / t1; |
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g2twist = 360 * teethtwist / t2; |
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g1p_d = t1 * cp / 180; |
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g2p_d = t2 * cp / 180; |
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g1p_r = g1p_d/2; |
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g2p_r = g2p_d/2; |
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echo(str("Your small ", t1, "-toothed gear will be ", g1p_d, "mm across (plus 1 gear tooth size) (PR=", g1p_r,")")); |
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echo(str("Your large ", t2, "-toothed gear will be ", g2p_d, "mm across (plus 1 gear tooth size) (PR=", g2p_r,")")); |
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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.")); |
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echo(str("Your gear mount axles should be ", d,"mm (", g1p_r+g2p_r,"mm calculated) from each other.")); |
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if(which == 1) |
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{ |
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// GEAR 1 |
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difference() |
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{ |
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union() |
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{ |
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translate([0,0,(gear_h/2) - TT]) |
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gear( twist = g1twist, |
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number_of_teeth=t1, |
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circular_pitch=cp, |
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gear_thickness = gear_shaft_h + (gear_h/2)+AT, |
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rim_thickness = (gear_h/2)+AT, |
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rim_width = 0, |
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hub_thickness = (gear_h/2)+AT, |
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hub_width = 0, |
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bore_diameter=0); |
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translate([0,0,(gear_h/2) + AT]) |
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rotate([180,0,0]) |
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gear( twist = -g1twist, |
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number_of_teeth=t1, |
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circular_pitch=cp, |
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gear_thickness = (gear_h/2)+AT, |
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rim_thickness = (gear_h/2)+AT, |
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hub_thickness = (gear_h/2)+AT, |
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bore_diameter=0); |
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} |
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//DIFFERENCE: |
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//shafthole |
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translate([0,0,-TT]) |
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cylinder(r=gear1_shaft_r, h=gear_h+gear_shaft_h+ST); |
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//setscrew shaft |
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translate([0,0,gear_h+gear_shaft_h-gear1_setscrew_offset]) |
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rotate([0,90,0]) |
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cylinder(r=gear1_setscrew_r, h=g1p_r); |
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//setscrew captive nut |
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translate([(g1p_r)/2, 0, gear_h+gear_shaft_h-gear1_captive_nut_r-gear1_setscrew_offset]) |
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translate([0,0,(gear1_captive_nut_r+gear1_setscrew_offset)/2]) |
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#cube([gear1_captive_nut_h, gear1_captive_nut_d, gear1_captive_nut_r+gear1_setscrew_offset+ST],center=true); |
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} |
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} |
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else |
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{ |
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// GEAR 2 |
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difference() |
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{ |
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union() |
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{ |
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translate([0,0,(gear_h/2) - TT]) |
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gear( twist = -g2twist, |
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number_of_teeth=t2, |
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circular_pitch=cp, |
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gear_thickness = /* gear_shaft_h + */ (gear_h/2)+AT, |
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rim_thickness = (gear_h/2)+AT, |
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rim_width = gear2_rim_margin, |
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hub_diameter = gear2_shaft_outer_d, |
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hub_thickness = (gear_h/2)+AT, |
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bore_diameter=0, |
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circles = gear2_cut_circles); |
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translate([0,0,(gear_h/2) + AT]) |
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rotate([180,0,0]) |
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gear( twist = g2twist, |
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number_of_teeth=t2, |
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circular_pitch=cp, |
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gear_thickness = (gear_h/2)+AT, |
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rim_thickness = (gear_h/2)+AT, |
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rim_width = gear2_rim_margin, |
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hub_diameter = gear2_shaft_outer_d, |
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hub_thickness = (gear_h/2)+AT, |
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bore_diameter=0, |
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circles = gear2_cut_circles); |
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} |
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//DIFFERENCE: |
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//shafthole |
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//translate([0,0,-TT]) |
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//cylinder(r=gear2_shaft_r, h=gear_h+gear_shaft_h+ST); |
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//setscrew shaft |
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//translate([0,0,gear_h+gear_shaft_h-gear2_setscrew_offset]) |
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// rotate([0,90,0]) |
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// cylinder(r=gear2_setscrew_r, h=gear2_shaft_outer_d); |
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//setscrew captive nut |
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translate([(gear2_shaft_outer_d)/2, 0, gear_h+gear_shaft_h-gear2_captive_nut_r-gear2_setscrew_offset]) |
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translate([0,0,(gear2_captive_nut_r+gear2_setscrew_offset)/2]) |
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#cube([gear2_captive_nut_h, gear2_captive_nut_d, gear2_captive_nut_r+gear2_setscrew_offset+ST],center=true); |
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//trim shaft |
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//difference() |
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//{ |
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// translate([0,0,gear_h+AT]) cylinder(h=gear_shaft_h+ST, r=g2p_r); |
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// translate([0,0,gear_h]) cylinder(h=gear_shaft_h, r=gear2_shaft_outer_r); |
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//} |
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//hex bolt shaft |
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translate([0,0,-TT]) cylinder(r=gear2_bolt_hex_r, h=gear_h+gear_shaft_h-gear2_bolt_sink+AT,$fn=6); |
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} |
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// hex bolt shaft bridge aid. |
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//translate([0,0,gear_h+gear_shaft_h-gear2_bolt_sink]) |
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// bridge_helper(); |
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//translate([0,0,gear_h+gear_shaft_h-gear2_bolt_sink+bridge_helper_h/3]) |
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// rotate([0,0,60]) bridge_helper(); |
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//translate([0,0,gear_h+gear_shaft_h-gear2_bolt_sink+((bridge_helper_h/3)*2)]) |
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// rotate([0,0,-60]) bridge_helper(); |
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} |
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} |
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t1 = gear1_teeth; |
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t2 = gear2_teeth; |
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cp = 360*distance_between_axels/(t1+t2); |
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g1p_d = t1 * cp / 180; |
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g2p_d = t2 * cp / 180; |
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g1p_r = g1p_d/2; |
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g2p_r = g2p_d/2; |
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if(generate == 1) |
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{ |
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gearsbyteethanddistance(t1 = gear1_teeth, t2=gear2_teeth, d=distance_between_axels, which=1); |
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} |
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else if(generate == 2) |
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{ |
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gearsbyteethanddistance(t1 = gear1_teeth, t2=gear2_teeth, d=distance_between_axels, which=2); |
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} |
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else |
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{ |
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translate([-g1p_r,0,0]) rotate([0,0,($t*360/gear1_teeth)]) gearsbyteethanddistance(t1 = gear1_teeth, t2=gear2_teeth, d=distance_between_axels, which=1); |
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translate([g2p_r,0,0]) rotate([0,0,($t*360/gear2_teeth)*-1]) gearsbyteethanddistance(t1 = gear1_teeth, t2=gear2_teeth, d=distance_between_axels, which=2); |
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} |
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