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G6-parts.scad
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////////////////////////
// Gugulele 6 Body Parts
//////////////////////////
// neck by layer, 0 is top, 1 is bottom
module neck(layer, front_scale, nlen, nwth, nslope, top_scale, bot_scale) {
neck_tl_wth = nwth +2*nlen*nslope;
prelen = FIT_TOL + nlen/front_scale;
ntw = neck_tl_wth + FIT_TOL*2*nslope;
planes = [-neck_tl_wth-1, 0];
scales = [top_scale, bot_scale];
scale([front_scale, 1, scales[layer] ]) difference() {
translate([prelen, 0, 0]) rotate([0, -90, 0])
cylinder(r2=nwth/2, r1=ntw/2, h=prelen, $fn=HIRES);
translate([-1, -ntw/2 -1, planes[layer]])
cube([prelen+2, ntw+2, ntw+1]);
}
}
// shoulder by layer, 0 is top, 1 is bottom
module shoulder(layer, front_scale, shoulder_len, torso_len, shoulder_curve_R,
shoulder_rtop, shoulder_rbot, shoulder_atop, shoulder_abot,
top_scale, bot_scale) {
prelen = shoulder_len/front_scale;
tlen = torso_len/front_scale;
planes = [-2*shoulder_rbot-1, 0];
scales = [top_scale, bot_scale];
scale([front_scale, 1, scales[layer] ])
difference() {
translate([prelen, 0, 0])
rotate([0, -90, 0])
funnel(shoulder_curve_R, shoulder_rtop, shoulder_atop, shoulder_abot);
translate([-1, -shoulder_rbot -1, planes[layer]])
cube([prelen+2, 2*shoulder_rbot+2, 2*shoulder_rbot+1]);
}
}
module torso(layer, front_scale, torso_len, body_rad,
top_scale, bot_scale) {
tlen = torso_len/front_scale;
planes = [-body_rad-1, 0];
scales = [top_scale, bot_scale];
scale([front_scale, 1, scales[layer] ]) difference() {
translate([tlen, 0, 0])
sphere(r=body_rad, $fn=HIRES);
translate([-1, -body_rad -1, planes[layer]])
cube([2*body_rad+2, 2*body_rad+2, body_rad+1]);
translate([-2*body_rad, -body_rad -1, -body_rad-1])
cube([2*body_rad, 2*body_rad+2, 2*body_rad+2]);
translate([tlen, -body_rad -1, -body_rad-1])
cube([2*body_rad+1, 2*body_rad+2, 2*body_rad+2]);
}
}
module butt(layer, back_scale, body_rad, top_scale, bot_scale) {
scale([back_scale, 1, (layer == 0 ? top_scale : bot_scale)] )
rotate([(layer == 0 ? 0 : 180), 0, 0 ])
quartersphere(body_rad, res=HIRES);
}
// The Main Gourd Shape that could be used as neck+body and head
module gourd(layers, nlen, nwth, nslope, mlen, flare, back_ratio, top_scale, bot_scale) {
shoulder_rtop = shoulder_rtop(nlen, nwth, nslope);
shoulder_atop = shoulder_atop(nslope);
shoulder_abot = shoulder_abot(nslope, flare);
shoulder_curve_R = shoulder_curve_R(nlen, nwth, nslope, flare);
shoulder_rbot = shoulder_rbot(nlen, nwth, nslope, flare);
body_rad = body_rad(nlen, nwth, nslope, flare);
front_scale = front_scale(nlen, nwth, nslope, mlen, flare);
back_scale = back_scale(nlen, nwth, nslope, mlen, flare, back_ratio);
shoulder_len = shoulder_len(nlen, nwth, nslope, mlen, flare);
torso_len = torso_len(nlen, nwth, nslope, mlen, flare);
butt_len = butt_len(nlen, nwth, nslope, mlen, flare, back_ratio);
for (i=layers) {
translate([0, 0, i == 0 ? -FUSE_SHIFT : 0])
neck(i, front_scale, nlen, nwth, nslope, top_scale, bot_scale);
translate([nlen -FUSE_SHIFT, 0, (i==0 ? -FUSE_SHIFT : 0)])
shoulder(i, front_scale, shoulder_len, torso_len,
shoulder_curve_R, shoulder_rtop, shoulder_rbot,
shoulder_atop, shoulder_abot,
top_scale, bot_scale);
translate([nlen + shoulder_len -2*FUSE_SHIFT, 0, (i==0 ? -FUSE_SHIFT : 0) ] )
torso(i, front_scale, torso_len, body_rad,
top_scale, bot_scale);
translate([nlen + shoulder_len + torso_len -3*FUSE_SHIFT, 0, (i==0 ? -FUSE_SHIFT : 0) ])
butt(i, back_scale, body_rad, top_scale, bot_scale);
}
}
module dovetail(is_cut=false) {
cut_adj = is_cut ? FIT_TOL : 0;
trapezoid(NECK_JOINT_WTH2 +2*cut_adj, NECK_JOINT_WTH1 +2*cut_adj,
NECK_JOINT_TCK +2*cut_adj, NECK_JOINT_TCK +2*cut_adj,
NECK_JOINT_LEN +2*cut_adj);
translate([0, 0, (is_cut ? FUSE_SHIFT: 0)])
scale([1, 1, .25])
difference() {
rotate([0, 90, 0])
cylinder(r2=NECK_JOINT_WTH1/2 +cut_adj, r1=NECK_JOINT_WTH2/2 +cut_adj, h=NECK_JOINT_LEN +2*cut_adj);
translate([0, -200, 0]) cube([400, 400, 400]);
}
}
module shoulder_joint(is_cut=false) {
cut_adj = is_cut ? 2*FIT_TOL : 0;
difference() {
hull()
for(ud = [0, -1]) {
for(lr = [-1, 1]) {
translate([(SHOULDER_JNT_LEN+cut_adj)/2,
lr*(SHOULDER_JNT_WTH+cut_adj)/2,
ud*(SHOULDER_JNT_TCK+cut_adj)-(V_GAP > 0 ? 0 : SHOULDER_JNT_TCK/3)])
rotate([0, 0, 90])
round_rod(SHOULDER_JNT_LEN+cut_adj, 1);
}
}
if (V_GAP > 0) {
translate([-500, -500, 0])
cube([1000, 1000, 1000]);
}
}
}
module body() {
shoulder_rtop = shoulder_rtop(NECK_LEN, NECK_HEAD_WTH, NECK_SLOPE);
shoulder_atop = shoulder_atop(NECK_SLOPE);
shoulder_abot = shoulder_abot(NECK_SLOPE, SHOULDER_FLARE);
shoulder_curve_R = shoulder_curve_R(NECK_LEN, NECK_HEAD_WTH, NECK_SLOPE, SHOULDER_FLARE);
shoulder_rbot = shoulder_rbot(NECK_LEN, NECK_HEAD_WTH, NECK_SLOPE, SHOULDER_FLARE);
body_rad = BODY_RAD;
shoulder_len = shoulder_len(NECK_LEN, NECK_HEAD_WTH, NECK_SLOPE, SCALE_LEN, SHOULDER_FLARE);
torso_len = torso_len(NECK_LEN, NECK_HEAD_WTH, NECK_SLOPE, SCALE_LEN, SHOULDER_FLARE);
front_scale = BODY_FRONT_SCALE;
back_scale = BODY_BACK_SCALE;
chamber_rad = body_rad - BODY_TCK;
chamber_front_scale = CHAMBER_BODY_RATIO*front_scale;
chamber_back_scale = CHAMBER_BODY_RATIO*back_scale*CHAMBER_BACK_RATIO;
top_front_vol = PI*(chamber_front_scale*chamber_rad)*(CHAMBER_TOP_SCALE*chamber_rad)*chamber_rad/3;
top_back_vol = PI*(chamber_back_scale*chamber_rad)*(CHAMBER_TOP_SCALE*chamber_rad)*chamber_rad/3;
bot_front_vol = PI*(chamber_front_scale*chamber_rad)*(CHAMBER_BOTTOM_SCALE*chamber_rad)*chamber_rad/3;
bot_back_vol = PI*(chamber_back_scale*chamber_rad)*(CHAMBER_BOTTOM_SCALE*chamber_rad)*chamber_rad/3;
chamber_vol = top_front_vol +top_back_vol +bot_front_vol +bot_back_vol;
echo(str("Chamber volume = ",chamber_vol, "(mm^3)"));
// subtract spine & brace?
chmb_len = chamber_rad*(chamber_front_scale + chamber_back_scale);
echo(str("chamber len = ", chmb_len, "mm"));
spine_vol_chmb = (SPINE_STYLE >=2 ? SPINE_HT*SPINE_WTH*chmb_len*(SPINE_GAP > 0 ? 2 : 1) : 0);
echo(str("spine_vol_chmb = ", spine_vol_chmb, "mm^3"));
brace_vol_chmb = [0, 2*chmb_len*BRACE_LEN_RATIO*BRACE_WTH,
chmb_len*BRACE_LEN_RATIO*body_rad*BRACE_SPAN_RATIO][BRACE_STYLE];
echo(str("brace_vol_chmb = ", brace_vol_chmb, "mm^3"));
adj_chmb_vol = chamber_vol -spine_vol_chmb -brace_vol_chmb;
echo(str("adjusted chamber volume = ", adj_chmb_vol, "mm^3"));
hook_wth = HOOK_WTH_RATIO*body_rad;
hook_len = HOOK_LEN_RATIO*torso_len;
fholes_area = 2 *2 *hook_area(hook_wth, hook_len);
top_hole_rad = TOP_HOLE_RATIO*body_rad;
top_hole_area = PI*pow(top_hole_rad, 2);
oval_len = OVAL_LEN_RATIO*body_rad; //1.4*front_scale*.12*body_rad;
oval_wth = OVAL_WTH_RATIO*body_rad;
sgl_o = PI * oval_len * oval_wth;
dbl_o = 2*sgl_o;
harea = ([0, fholes_area, top_hole_area, dbl_o, sgl_o][(SNDHOLE_STYLE -SNDHOLE_STYLE%2)/2])/
pow(1000, 2);
hvol = adj_chmb_vol/pow(1000,3);
/* from
http://www.acousticmasters.com/AcousticMasters_GuitarBody2.htm
https://newt.phys.unsw.edu.au/jw/Helmholtz.html
*/
max_tck = body_rad*TOP_SCALE -chamber_rad*CHAMBER_TOP_SCALE
-CHAMBER_UP_SHIFT +CHAMBER_FRONT_SHIFT*tan(CHAMBER_TILT) ;
sndbd_tck = max_tck;
echo(str("sndbd_tck (mm): ", sndbd_tck));
tube_len = sndbd_tck + 1.7*[0,
hook_len,
top_hole_rad,
oval_len+oval_wth,
(oval_len+oval_wth)/2
][(SNDHOLE_STYLE -SNDHOLE_STYLE%2)/2];
helmholz_freq = (SND_AIR_SPEED * sqrt(harea/(hvol * .001*tube_len)))/(2 *PI);
echo(str("helmholz_freq = ", helmholz_freq, "hz"));
echo(str("adjusted helmholz_freq = ", .98*helmholz_freq, "hz"));
body_len = BODY_LEN;
echo(str("Body Length = ", body_len, "mm"));
screws_xy = [
[NECK_LEN +N_GAP +.1*shoulder_len, body_rad*.205],
[NECK_LEN +N_GAP +.5*shoulder_len, body_rad*.27],
[NECK_LEN +N_GAP +.9*shoulder_len, body_rad*.5],
[NECK_LEN +N_GAP +shoulder_len +torso_len*.34, body_rad*.82 ],
[NECK_LEN +N_GAP +shoulder_len +torso_len, body_rad*.965],
[body_len +N_GAP -10, body_rad*.55],
[body_len +N_GAP -3, body_rad*.15]
];
difference() {
union() {
if (SHOW_NECK) {
translate([0, 0, -V_GAP])
neck(1, front_scale, NECK_LEN, NECK_HEAD_WTH, NECK_SLOPE,
TOP_SCALE, BOTTOM_SCALE);
}
if (SHOW_SHOULDER_TOP) {
translate([NECK_LEN +N_GAP -FUSE_SHIFT, 0, -FUSE_SHIFT]) {
fs_len = (1-SHOULDER_SPLIT_RATIO)*shoulder_len;
bs_len = SHOULDER_SPLIT_RATIO*shoulder_len;
for (sx = (S_GAP == 0 ? [0] : V_GAP > 0 ? [S_GAP] : [0, S_GAP])) {
translate([sx, 0, 0]) {
difference() {
shoulder(0, front_scale, shoulder_len, torso_len,
shoulder_curve_R, shoulder_rtop, shoulder_rbot,
shoulder_atop, shoulder_abot,
TOP_SCALE, BOTTOM_SCALE);
if (S_GAP > 0 && V_GAP == 0) {
translate([(sx > 0 ? -bs_len : fs_len), -500, -FUSE_SHIFT])
cube([shoulder_len, 1000, 1000]);
}
}
}
}
}
}
if (SHOW_TOP) {
translate([NECK_LEN +N_GAP +S_GAP + shoulder_len -2*FUSE_SHIFT, 0, -FUSE_SHIFT])
torso(0, front_scale, torso_len, body_rad, TOP_SCALE, BOTTOM_SCALE);
intersection() {
// intersect with top butt piece to make sure the joint is seamless
if (TOP_RND_RAD > 0) {
translate([NECK_LEN +N_GAP +S_GAP + shoulder_len + torso_len -3*FUSE_SHIFT, 0, -FUSE_SHIFT])
butt(0, back_scale*1.1, body_rad, TOP_SCALE, BOTTOM_SCALE);
}
minkowski() {
difference() {
translate([NECK_LEN +N_GAP +S_GAP + shoulder_len + torso_len -3*FUSE_SHIFT, 0, -FUSE_SHIFT])
butt(0, back_scale, body_rad -TOP_RND_RAD, TOP_SCALE, BOTTOM_SCALE);
if (HEAD_STYLE != 1) {
translate([N_GAP +S_GAP, 0, TUNER_UPLIFT -TUNER_BD_TCK -2*FIT_TOL])
tail_pegs(is_cut = true);
}
// Flat butt cut
if (BUTT_CHOP > 0) {
translate([body_len +N_GAP +S_GAP, -200, -200])
cube([400,400,400]);
}
}
if (TOP_RND_RAD > 0) {
sphere(r=TOP_RND_RAD, $fn=LORES);
}
}
}
}
if (SHOW_SHOULDER_BOTTOM) {
fs_len = (1-SHOULDER_SPLIT_RATIO)*shoulder_len;
bs_len = SHOULDER_SPLIT_RATIO*shoulder_len;
tck = NECK_JOINT_TCK*2;
translate([NECK_LEN +N_GAP -FUSE_SHIFT, 0, -V_GAP]) {
for (sx = (S_GAP == 0 ? [0] : [0, S_GAP])) {
translate([sx, 0, 0]) {
difference() {
shoulder(1, front_scale, shoulder_len, torso_len,
shoulder_curve_R, shoulder_rtop, shoulder_rbot,
shoulder_atop, shoulder_abot,
TOP_SCALE, BOTTOM_SCALE);
if (S_GAP > 0) {
if (sx == 0) {
translate([fs_len, -500, -500])
cube([1000, 1000, 1000]);
} else {
translate([fs_len -1000, -500, -500])
cube([1000, 1000, 1000]);
translate([fs_len-FIT_TOL, 0, 0])
shoulder_joint(is_cut=true);
}
}
}
}
}
if (S_GAP > 0) {
translate([fs_len -FUSE_SHIFT, 0, 0])
shoulder_joint(is_cut=false);
}
}
}
if (SHOW_BOTTOM) {
translate([NECK_LEN +N_GAP +S_GAP + shoulder_len -2*FUSE_SHIFT, 0, -V_GAP])
torso(1, front_scale, torso_len, body_rad, TOP_SCALE, BOTTOM_SCALE);
difference() {
minkowski() {
difference() {
translate([NECK_LEN +N_GAP +S_GAP + shoulder_len + torso_len -3*FUSE_SHIFT, 0, -V_GAP])
butt(1, back_scale, body_rad -BOT_RND_RAD, TOP_SCALE, BOTTOM_SCALE);
if (HEAD_STYLE != 1) union(){
if (TUNER_STYLE < 2 || FORCE_TAIL_CAVITY) {
translate([N_GAP +S_GAP, 0, -V_GAP])
tail_tuner_cavity(4*BOT_RND_RAD);
}
translate([N_GAP +S_GAP, 0, TUNER_UPLIFT -TUNER_BD_TCK +FIT_TOL -V_GAP])
tail_pegs(is_cut = true);
}
// Flat butt cut
if (BUTT_CHOP > 0) {
translate([body_len +N_GAP +S_GAP, -200, -200])
cube([400,400,400]);
}
if (PICKUP_STYLE > 0) {
place_pickup(is_cut=true);
}
}
if (BOT_RND_RAD > 0) {
scale([1, 1, BOTTOM_SCALE])
sphere(r=BOT_RND_RAD, $fn=LORES);
}
}
// shave away extra top material from rounding edges in bottom half
if (BOT_RND_RAD > 0) {
translate([N_GAP +S_GAP, -500, -V_GAP])
cube([1000, 1000, 100]);
}
if (HEAD_STYLE != 1)
translate([N_GAP +S_GAP, 0, TUNER_UPLIFT -TUNER_BD_TCK +FIT_TOL -V_GAP])
tail_peg_anchors(is_cut = true);
}
}
if (SHOW_BOTTOM && C_GAP > 0) {
translate([0, 0, -C_GAP]) {
intersection() {
difference() {
union() {
translate([NECK_LEN +N_GAP +S_GAP + shoulder_len -2*FUSE_SHIFT, 0, -V_GAP] )
torso(1, front_scale, torso_len, body_rad, TOP_SCALE, BOTTOM_SCALE);
translate([NECK_LEN +N_GAP +S_GAP + shoulder_len + torso_len -3*FUSE_SHIFT, 0, -V_GAP])
butt(1, back_scale, body_rad, TOP_SCALE, BOTTOM_SCALE);
}
// chamber cut
if (CHAMBER_BODY_RATIO > 0) {
translate([NECK_LEN +N_GAP +S_GAP +shoulder_len +torso_len -CHAMBER_FRONT_SHIFT,
0, CHAMBER_UP_SHIFT])
rotate([0, -CHAMBER_TILT, 0])
chamber(chamber_front_scale, chamber_back_scale, chamber_rad);
}
}
difference() {
translate([NECK_LEN +N_GAP +S_GAP +shoulder_len +torso_len -BACK_COVER_SHIFT, 0, -V_GAP])
back_cover(body_rad, BOTTOM_SCALE, front_scale, back_scale, is_cut=false);
place_pickup(is_cut=true);
}
}
}
}
if (SHOW_SHOULDER_BOTTOM && N_GAP > 0) {
// dovetail joint
translate([NECK_LEN +N_GAP -NECK_JOINT_LEN +FUSE_SHIFT, 0,
-NECK_JOINT_TCK -V_GAP])
dovetail(is_cut=false);
}
if (SHOW_TOP && BRDG_STYLE == 1) {
// bridge seat
translate([SCALE_LEN +N_GAP +S_GAP + (HEAD_STYLE ==1 && STRTIE_STYLE !=2 ? -1+BRDG_WTH/2 : 0),
0, BRDG_SET -.25*BRDG_TCK])
cube([BRDG_WTH+2, BRDG_LEN+2, .5*BRDG_TCK], center = true);
}
if (USE_SCREWS && SHOW_SCREWS && V_GAP > 0) {
sz = -V_GAP/2;
for(sxy = screws_xy) {
if (HEAD_STYLE==1 || sxy[0] < (.9*body_len +N_GAP +S_GAP)) {
for (lr = [1, -1]) {
translate([sxy[0] +S_GAP, lr*sxy[1], sz])
screw(BODY_SCREW_MDL, thread="no");
}
}
}
}
if (S_GAP > 0 && SHOW_SCREWS) {
//screw shoulders together
for (lr = [-1, 1]) {
translate([NECK_LEN +N_GAP +(1-SHOULDER_SPLIT_RATIO)*shoulder_len + SHOULDER_JNT_LEN/2,
lr*(-6+SHOULDER_JNT_WTH/2), V_GAP == 0 ? 50 : -V_GAP/2]) {
screw(SHOULDER_SCREW_MDL, thread=SCREW_THREAD);
}
}
}
}
if (SHOW_SHOULDER_TOP || SHOW_SHOULDER_BOTTOM || SHOW_TOP || SHOW_BOTTOM) {
// chamber cut
if (CHAMBER_BODY_RATIO > 0) {
translate([NECK_LEN +N_GAP +S_GAP +shoulder_len +torso_len -CHAMBER_FRONT_SHIFT,
0, CHAMBER_UP_SHIFT])
rotate([0, -CHAMBER_TILT, 0])
chamber(chamber_front_scale, chamber_back_scale, chamber_rad);
}
}
if (S_GAP > 0 && USE_SCREWS) {
//screw shoulders together
for (fb = [0, 1])
for (lr = [-1, 1])
translate([NECK_LEN +N_GAP +fb*S_GAP + (1-SHOULDER_SPLIT_RATIO)*shoulder_len + SHOULDER_JNT_LEN/2,
lr*(-4+SHOULDER_JNT_WTH/2), (V_GAP > 0 ? -V_GAP-4 : -2)]) {
cylinder(r=SHOULDER_SCREW_HEAD_RAD +FIT_TOL, h=40);
screw(SHOULDER_SCREW_MDL, thread=SCREW_THREAD);
}
}
// shoulder fretboard joint cut
if ((SHOW_SHOULDER_TOP || SHOW_TOP) && F_GAP+N_GAP+S_GAP > 0) {
for (sx = (S_GAP > 0 ? [0, S_GAP]: [0])) {
if (V_GAP > 0 || FORCE_FRETBD_TANG) {
translate([NECK_LEN +N_GAP +sx -FUSE_SHIFT,
-FRETBD_TOUNGE_WTH/2 -FIT_TOL,
(V_GAP > 0 ? -FIT_TOL: sx > 0 ? -FIT_TOL : 0)])
cube([FRETBD_TOUNGE_LEN +FIT_TOL,
FRETBD_TOUNGE_WTH +2*FIT_TOL, body_rad]);
} else {
translate([N_GAP+sx, 0, 0]) fretboard(is_cut = true);
}
}
}
// sound port cut
if (SHOW_BOTTOM && len(search(SNDHOLE_STYLE, [1, 3, 5, 7])) > 0) {
//echo(str("Sound port area (m^2): ", sport_area));
translate( [NECK_LEN +N_GAP +S_GAP +shoulder_len +(V_GAP >0 ?.7 :.5)*torso_len,
0, -.2*body_rad*BOTTOM_SCALE -V_GAP])
sound_port(.75*body_rad);
}
// f-hole cut
if (SHOW_TOP && len(search(SNDHOLE_STYLE, [2, 3])) > 0) {
echo(str("F holes total area (m^2): ", fholes_area));
fhole(shoulder_len, torso_len, body_rad, hook_wth, hook_len);
mirror([0,1,0]) fhole(shoulder_len, torso_len, body_rad, hook_wth, hook_len);
}
// Top-hole cut
if (SHOW_TOP && len(search(SNDHOLE_STYLE, [4, 5])) > 0) {
echo(str("Top hole area (m^2): ", top_hole_area));
translate( [NECK_LEN +N_GAP +S_GAP +shoulder_len +.15*torso_len, 0, 0])
cylinder(r = TOP_HOLE_RATIO *body_rad, h = body_rad);
}
// top oval hole cut
if (SHOW_TOP && len(search(SNDHOLE_STYLE, [6, 7, 8, 9])) > 0) {
echo(str("Oval holes total area (m^2): ", harea));
translate( [NECK_LEN +N_GAP +S_GAP +shoulder_len +(1-OVAL_PLCMT_RATIO)*body_rad, 0, -FUSE_SHIFT])
oval_holes(body_rad, front_scale, oval_len, oval_wth);
}
// screw top and bottom of body together
if (USE_SCREWS && V_GAP > 0) {
for(sadj = (S_GAP > 0 ? [0, S_GAP] : [0])) {
for(cxy = screws_xy) {
if (sadj == S_GAP || cxy[0] < NECK_LEN + N_GAP + shoulder_len) {
if (HEAD_STYLE==1 || cxy[0] < (.9*body_len +N_GAP)) {
for (cz = [1, 1-V_GAP]) {
if ((SHOW_TOP && cz > 0) || (SHOW_BOTTOM && cz <0))
for (lr = [1, -1]) {
translate([cxy[0] +sadj, lr*cxy[1], cz]) {
if (cz >= 0)
cylinder(r=BODY_SCREW_HEAD_RAD, h=body_rad);
screw(BODY_SCREW_MDL, thread="no");
}
}
}
}
}
}
}
}
// screw fretboard to neck
if ((SHOW_NECK || SHOW_SHOULDER_TOP || SHOW_SHOULDER_BOTTOM || SHOW_TOP) &&
USE_SCREWS && V_GAP + F_GAP + N_GAP +S_GAP > 0) {
for(dz = (V_GAP > 0 ? [0, -V_GAP] :[0])) {
translate([0, 0, dz]) {
for(dx = (N_GAP > 0 && S_GAP > 0 ? [0, N_GAP, N_GAP+S_GAP]:
N_GAP > 0 ? [0, N_GAP] :
S_GAP > 0 ? [0, S_GAP] : [0])) {
rotate([0, -FRETBD_RISE, 0])
translate([dx, 0, 0])
deco_frets_from_nut(F1_LEN, F1_LEN / SEMI_RATIO, 1, true,
from=(dx == 0 ? 0 : dx == N_GAP || dx == S_GAP ? 12 : 17),
to=(dx + N_GAP + S_GAP == 0 ? 24 : dx == 0 ? 20 : 24));
}
}
}
}
// screw head to neck
if ((SHOW_NECK || SHOW_HEAD) && USE_SCREWS && H_GAP > 0) {
for(lr = SPINE_STYLE > 0 && SPINE_GAP > 0 ? [0] : [1, -1]) {
translate([-HEAD_SCREW_PREDEP,
lr*NUT_HOLE_GAP,
-HEAD_SCREW_PLCMT -V_GAP])
rotate([0, -90, 0]) {
cylinder(r=HEAD_SCREW_HEAD_RAD +FIT_TOL, h=40);
screw(HEAD_SCREW_MDL, thread=SCREW_THREAD);
}
}
}
if (SHOW_NECK && N_GAP > 0) {
translate([NECK_LEN -NECK_JOINT_LEN, 0,
-NECK_JOINT_TCK -V_GAP -FIT_TOL ])
dovetail(is_cut=true);
}
if (SHOW_TOP && B_GAP > 0) {
translate([SCALE_LEN +N_GAP +S_GAP, 0, BRDG_SET])
bridge(is_cut = true);
}
if (SHOW_TOP && (HEAD_STYLE==0 || HEAD_STYLE==2) && G_GAP > 0) {
translate([STR_GUIDE_PLCMT +N_GAP +S_GAP, 0,
BRDG_SET -STR_GUIDE_SET_OFF_BRDG +.5])
strings_guide(is_cut = true);
}
if (SHOW_TOP && HEAD_STYLE==1) {
if (STRTIE_STYLE == 0) {
translate([SCALE_LEN +N_GAP +S_GAP, 0, BRDG_SET])
thru_holes();
} else if (STRTIE_STYLE == 2) {
strtie_entry = .1*BUTT_LEN;
groove_rad = BODY_RAD*TOP_SCALE*.5;
strtie_angle = (V_GAP > 0 ? 130 : 145);
tail_hole_gap = BODY_LEN*NECK_SLOPE*2/NUM_STRS +NUT_HOLE_GAP;
translate([BODY_LEN - strtie_entry, 0, BRDG_SET])
string_holes(strtie_angle, tail_hole_gap, .5);
translate([BODY_LEN+(.05*BUTT_LEN), 0, groove_rad - (V_GAP > 0 ? .25 : .75)*strtie_entry])
round_rod(1.1*(NUM_STRS-1)*tail_hole_gap, groove_rad);
}
}
if (SHOW_BOTTOM && C_GAP > 0) {
translate([NECK_LEN +N_GAP +S_GAP +shoulder_len +torso_len -BACK_COVER_SHIFT, 0, -V_GAP])
back_cover(body_rad, BOTTOM_SCALE, front_scale, back_scale, is_cut=true);
}
}
if (USE_SCREWS && SHOW_SCREWS && V_GAP + F_GAP > 0)
translate([0, 0, .5*F_GAP -.5*V_GAP])
rotate([0, -FRETBD_RISE, 0])
deco_frets_from_nut(F1_LEN, F1_LEN / SEMI_RATIO, 1, true);
// under soundboard reinforcement for bridge
if (SHOW_TOP && BRDG_STYLE == 2) {
difference() {
translate([SCALE_LEN +N_GAP +S_GAP, 0, BRDG_SET -.25*BRDG_TCK])
scale([BRDG_WTH*3, 1, .6666666*BRDG_TCK])
round_rod(BRDG_LEN, .3);
// slice top half off
translate([SCALE_LEN +N_GAP +S_GAP, 0, BRDG_SET])
cube([BRDG_WTH*1.5, BRDG_LEN*1.5, .25*BRDG_TCK], center = true);
// bridge foot print incl. screw holes
translate([SCALE_LEN +N_GAP +S_GAP, 0, BRDG_SET])
bridge(is_cut = true);
}
}
}
module head(wth, stem, nslope) {
clen = 200; // arbitray side of cube to use as cut
glen = gourd_len(stem, wth, nslope, HEAD_MIDLEN, HEAD_FLARE, HEAD_FRONT_BACK_RATIO);
head_len = [ stem, glen, glen ][HEAD_STYLE];
echo(str("Head Length = ", head_len));
if (USE_SCREWS && SHOW_SCREWS && H_GAP > 0) {
for(ud = [1, -1]) {
translate([-.5*H_GAP, ud*NUT_HOLE_GAP, -HEAD_SCREW_PLCMT -V_GAP])
rotate([0, -90, 0]) {
screw(HEAD_SCREW_MDL, thread=SCREW_THREAD);
}
}
}
difference() {
stem_wth = wth -2*stem*nslope;
// Solid head parts
if (HEAD_STYLE==0) { // minimal headless
// head stem bottom is extension of neck
translate([FUSE_SHIFT -H_GAP, 0, -V_GAP])
scale([1, 1, BOTTOM_SCALE])
difference() {
translate([0, 0, FUSE_SHIFT]) rotate([0, -90, 0])
cylinder(r2=stem_wth/2, r1=wth/2, h=stem, $fn=HIRES);
translate([-clen, -clen/2, 0])
cube([clen, clen, clen]);
}
// head stem top is extension of fretboard if head is one with neck
translate([-stem -H_GAP, 0,
H_GAP > 0 ? -V_GAP -FUSE_SHIFT : F_GAP]) {
trapezoid(stem_wth, wth,
FRETBD_HD_TCK+.5*F0_RAD, FRETBD_HD_TCK+.5*F0_RAD, stem);
}
} else if (HEAD_STYLE==1) { // Headed w tuners
minkowski() {
difference() {
translate([FUSE_SHIFT -H_GAP, 0, -V_GAP])
rotate([ 0, 0, 180])
gourd([0, 1], stem, wth -2*HD_RND_RAD, nslope, HEAD_MIDLEN, HEAD_FLARE,
HEAD_FRONT_BACK_RATIO, HEAD_TOP_SCALE, BOTTOM_SCALE);
// slice top and bottom off at an angle
for (tbd = [ HEAD_SLICE[0], -clen +HEAD_SLICE[1] ]) {
translate([(tbd < 0 ? clen*tan(HEAD_ANGLE) :-stem ) -H_GAP +3,
0, tbd-V_GAP])
rotate([0, -HEAD_ANGLE, 0])
translate([-clen, -clen/2, 0])
cube([clen,clen,clen]);
}
// slice left and right off at an angle
for (i = [ 1, -1 ]) {
translate([-clen/2 -H_GAP,
i*(clen/2 +.5*NUT_HOLE_GAP*NUM_STRS),
-V_GAP])
rotate([0, 0, i*HEAD_SIDE_CUT_ANGLE])
translate([-clen/2, -clen/2, -clen/2])
cube([clen,clen,clen]);
}
translate([-H_GAP, 0, -V_GAP])
rotate([0, -HEAD_ANGLE, 0])
pegs();
}
if (HD_RND_RAD > 0)
scale([1, 1, BOTTOM_SCALE])
sphere(r=HD_RND_RAD, $fn=LORES);
}
} else { // decorative head
minkowski() {
difference() {
translate([FUSE_SHIFT -H_GAP, 0, -V_GAP])
rotate([ 0, 0, 180])
gourd([0, 1], stem, wth -2*HD_RND_RAD, nslope, HEAD_MIDLEN, HEAD_FLARE,
HEAD_FRONT_BACK_RATIO, HEAD_TOP_SCALE, BOTTOM_SCALE);
// cut groove at the top of headless stem
translate([ -.5*HEADLESS_TOP_GROOVE_RAD -H_GAP, clen/2,
HEADLESS_TOP_GROOVE_RAD -V_GAP +1])
scale(1, 1, 2)
rotate([90, 0, 0])
cylinder(r=HEADLESS_TOP_GROOVE_RAD, h=clen, $fn=HIRES);
// cut groove at front of headless stem
translate([HEADLESS_FRONT_GROOVE_PLCMT[0] -H_GAP,
clen/2,
HEADLESS_FRONT_GROOVE_PLCMT[2] -V_GAP])
scale([.7, 1, HEAD_POKED ? 1 : .7 ])
rotate([90, 0, 0])
cylinder(r=HEADLESS_FRONT_GROOVE_RAD, h=clen, $fn=HIRES);
}
if (HD_RND_RAD > 0)
scale([1, 1, BOTTOM_SCALE])
sphere(r=HD_RND_RAD, $fn=LORES);
}
}
// Subtract parts from head
if (HEAD_STYLE == 0 ) {
// cut string holes thru headless stem
translate([-2*STR_HOLE_RAD -H_GAP, 0, FRETBD_HD_TCK +F0_RAD -V_GAP])
string_holes(-90 -HEADLESS_STRING_ANGLE, NUT_HOLE_GAP);
if (F_GAP > 0) {
translate([-2*STR_HOLE_RAD -H_GAP, 0, FRETBD_HD_TCK +F0_RAD +
(H_GAP > 0 ? -V_GAP : F_GAP)])
string_holes(-90 -HEADLESS_STRING_ANGLE, NUT_HOLE_GAP);
}
// cut groove at the top of headless stem
translate([-2*F0_RAD -H_GAP, clen/2,
FRETBD_HD_TCK + F0_RAD +
(H_GAP > 0 ? -V_GAP : F_GAP)])
rotate([90, 0, 0])
cylinder(r=HEADLESS_TOP_GROOVE_RAD, h=clen, $fn=HIRES);
translate([ -1.5*F0_RAD -H_GAP, -clen/2,
FRETBD_HD_TCK +.5*F0_RAD -.5*HEADLESS_TOP_GROOVE_RAD +
(H_GAP > 0 ? -V_GAP -FUSE_SHIFT : F_GAP)])
cube([HEADLESS_TOP_GROOVE_RAD, clen, F0_RAD]);
// cut groove at the front of headless stem
translate([-stem -H_GAP, clen/2, -2 -V_GAP -1])
scale([.5, 1, 1])
rotate([90, 0, 0])
cylinder(r=HEADLESS_FRONT_GROOVE_RAD, h=clen, $fn=HIRES);
}
if (HEAD_STYLE == 1 ) {
// cut to level any sharp angle at fretboard joint
translate([-0.8*clen -H_GAP, -clen/2, FRETBD_HD_TCK])
cube([clen,clen,clen]);
}
if (HEAD_STYLE == 2) {
// cut string holes thru headless stem
translate([-2*STR_HOLE_RAD -H_GAP, 0, FRETBD_HD_TCK +F0_RAD -V_GAP])
string_holes(-90 -HEADLESS_STRING_ANGLE, NUT_HOLE_GAP);
// level joining end to fretboard to avoid sharp edges
translate([-.5*HEADLESS_TOP_GROOVE_RAD -H_GAP, -clen/2, -V_GAP+1+HD_RND_RAD])
cube([clen,clen,clen]);
}
// cut to fit fretboard
if (F_GAP +V_GAP +H_GAP > 0) {
translate([-H_GAP, 0, -V_GAP]) fretboard(is_cut = true);
}
if (SHOW_NECK && USE_SCREWS && H_GAP > 0) {
for(lr = SPINE_STYLE > 0 && SPINE_GAP > 0 ? [0] : [1, -1]) {
translate([-HEAD_SCREW_PREDEP -H_GAP,
lr*NUT_HOLE_GAP,
-HEAD_SCREW_PLCMT -V_GAP])
rotate([0, -90, 0]) {
cylinder(r=HEAD_SCREW_HEAD_RAD +FIT_TOL, h=40);
screw(HEAD_SCREW_MDL, thread=SCREW_THREAD);
}
}
// level joining end to fretboard to avoid sharp edges
translate([-.5*HEADLESS_TOP_GROOVE_RAD -H_GAP,
-clen/2, FRETBD_HD_TCK-0.5])
cube([clen,clen,clen]);
}
}
}
module fretboard(is_cut = false) {
cut_adj = (is_cut ? FIT_TOL :0);
shoulder_len = shoulder_len(NECK_LEN, NECK_HEAD_WTH, NECK_SLOPE, SCALE_LEN, SHOULDER_FLARE);
torso_len = torso_len(NECK_LEN, NECK_HEAD_WTH, NECK_SLOPE, SCALE_LEN, SHOULDER_FLARE);
fretbd_hd_tck = FRETBD_HD_TCK;
fretbd_hd_wth = NUT_HOLE_GAP*NUM_STRS;
fretbd_neck_tck = fretbd_hd_tck + NECK_LEN*tan(FRETBD_RISE);
fretbd_tl_tck = fretbd_hd_tck + FRETBD_LEN*tan(FRETBD_RISE);
fretbd_tl_wth = fretbd_hd_wth +2*FRETBD_LEN*NECK_SLOPE;
fretbd_extn_wth = fretbd_tl_wth +2*FRETBD_EXTN*NECK_SLOPE;
fretbd_extn_tck = fretbd_tl_tck + FRETBD_EXTN*tan(FRETBD_RISE);
f0_rad = F0_RAD +cut_adj;
f0_len = 4*fretbd_hd_wth;
front_scale = BODY_FRONT_SCALE;
shoulder_rtop = shoulder_rtop(NECK_LEN, NECK_HEAD_WTH, NECK_SLOPE);
shoulder_atop = shoulder_atop(NECK_SLOPE);
shoulder_abot = shoulder_abot(NECK_SLOPE, SHOULDER_FLARE);
shoulder_curve_R = shoulder_curve_R(NECK_LEN, NECK_HEAD_WTH, NECK_SLOPE, SHOULDER_FLARE);
shoulder_rbot = shoulder_rbot(NECK_LEN, NECK_HEAD_WTH, NECK_SLOPE, SHOULDER_FLARE);
difference() {
union() {
trapezoid(fretbd_hd_wth+2*cut_adj, fretbd_tl_wth+2*cut_adj,
fretbd_hd_tck, fretbd_tl_tck, FRETBD_LEN);
// Zeroth fret
translate([0, 0, fretbd_hd_tck])
scale([1, 1/4, 1]) round_rod(f0_len, f0_rad);
translate([0, 0, fretbd_hd_tck]) {
difference() {
scale([1, 1/4, FRETBD_HD_TCK/f0_rad])
round_rod(f0_len, f0_rad);
translate([-2*f0_rad, -4*fretbd_hd_wth, 0])
cube([4*f0_rad, 8*fretbd_hd_wth, 2*FRETBD_HD_TCK]);
}
}
// rolling extension to end of fretbd
translate([FRETBD_LEN-FUSE_SHIFT, 0, 0]) {
difference() {
// the main trapezoid of the extension
trapezoid(fretbd_tl_wth+2*cut_adj, fretbd_extn_wth+2*cut_adj,
fretbd_tl_tck, fretbd_extn_tck, FRETBD_EXTN+cut_adj);
if (!is_cut) {
// cut a notch where the roll off will happen
translate([FRETBD_EXTN/2, -fretbd_extn_wth/2,
fretbd_extn_tck-FRETBD_EXTN/2])
cube([FRETBD_EXTN/2, fretbd_extn_wth, FRETBD_EXTN/2]);
}
}
if (!is_cut) {
intersection() {
trapezoid(fretbd_tl_wth+2*cut_adj,
fretbd_extn_wth+2*cut_adj,
fretbd_tl_tck, fretbd_extn_tck, FRETBD_EXTN);
translate([FRETBD_EXTN/2 -FUSE_SHIFT, fretbd_extn_wth/2,
fretbd_extn_tck-FRETBD_EXTN/2-FUSE_SHIFT])
rotate([90,0,0])
difference() {
cylinder(r=FRETBD_EXTN/2, h=fretbd_extn_wth);
translate([-FRETBD_EXTN, -FRETBD_EXTN/2, 0])
cube([FRETBD_EXTN, FRETBD_EXTN, fretbd_extn_wth]);
translate([-FRETBD_EXTN/2, -FRETBD_EXTN, 0])
cube([FRETBD_EXTN, FRETBD_EXTN, fretbd_extn_wth]);
}
}
}
}
}
// string slots on Zeroth fret
if (!is_cut) {
translate([-2*f0_rad, 0, fretbd_hd_tck +f0_rad +.25*STR_HOLE_RAD])
string_holes(90, NUT_HOLE_GAP);
}
if (!is_cut && (V_GAP > 0 || FORCE_FRETBD_TANG) && F_GAP > 0) {
// use shoulder top to cut fretboard!
translate([NECK_LEN -FUSE_SHIFT -FIT_TOL, 0, TOP_RND_RAD + FIT_TOL]) {
shoulder(0, front_scale, shoulder_len, torso_len,
shoulder_curve_R, shoulder_rtop, shoulder_rbot,
shoulder_atop, shoulder_abot,
TOP_SCALE, BOTTOM_SCALE);
translate([shoulder_len-FUSE_SHIFT, 0, 0])
torso(0, front_scale, torso_len, BODY_RAD,
TOP_SCALE, BOTTOM_SCALE);
translate([0, -100, -100+FUSE_SHIFT])
cube([200, 200, 100]);
}
}
}
// tounge into shoulder groove
if (!is_cut && (V_GAP > 0 || FORCE_FRETBD_TANG) && F_GAP > 0) {
translate([NECK_LEN -FIT_TOL -FUSE_SHIFT, 0, 0])
trapezoid(FRETBD_TOUNGE_WTH, FRETBD_TOUNGE_WTH,
fretbd_neck_tck -2,
fretbd_tl_tck -2,
FRETBD_TOUNGE_LEN);
}
// inserts into spine groove
if (!is_cut && SPINE_STYLE == 3 && F_GAP > 0) {
difference() {
for (lr = USE_SCREWS ? [1, -1] : [0]) {
translate([SPINE_PRE_LEN, lr*SPINE_GAP/2, SPINE_RAISE +SPINE_HT])
rotate([0, SPINE_STYLE ==3 ? SPINE_DIP :0, lr*SPINE_FAN])
rect_spine(SPINE_LEN, SPINE_HT, SPINE_WTH, tented=SPINE_TENTED, beveled=false);
}
translate([0, -500, FUSE_SHIFT]) cube([1000, 1000, 1000]);
translate([-1000, -500, -500]) cube([1000, 1000, 1000]);
translate([FRETBD_LEN +(V_GAP > 0 ? -FIT_TOL : FRETBD_EXTN), -500, -500]) cube([1000, 1000, 1000]);
}
}
}
module bridge(is_cut = false) {
brdg_hole_gap = SCALE_LEN*NECK_SLOPE*2/NUM_STRS +NUT_HOLE_GAP;
cut_adj = (is_cut ?FIT_TOL :0);
cut_rad = HEAD_STYLE==1 ? (STRTIE_STYLE == 1 ? .4 : 1)*BRDG_WTH -SDDL_RAD : (BRDG_WTH/2)-SDDL_RAD;
cut_scale = HEAD_STYLE==1 ? BRDG_CARVE_SCALE : BRDG_CARVE_SCALE*2;
brdg_bottom = BRDG_TCK -cut_rad*cut_scale;
side_cut_rad = BRDG_TCK +SDDL_RAD -brdg_bottom;
brdg_len = BRDG_LEN;
difference() {
if (HEAD_STYLE==0 || HEAD_STYLE==2 || (HEAD_STYLE==1 && STRTIE_STYLE==2)) {
// bridge block
translate([-BRDG_WTH /2 -cut_adj, -brdg_len/2 -cut_adj, -cut_adj])
cube([BRDG_WTH +2*cut_adj, brdg_len +2*cut_adj, BRDG_TCK +cut_adj]);
// saddle
if (!is_cut)
translate([0, brdg_len/2, BRDG_TCK])
rotate([90,0,0]) cylinder(h=brdg_len, r=SDDL_RAD);
} else {
// bridge block
translate([-SDDL_RAD -cut_adj, -brdg_len/2 -cut_adj, -cut_adj])
cube([BRDG_WTH +2*cut_adj, brdg_len +2*cut_adj, BRDG_TCK +cut_adj]);
// saddle
if (!is_cut)
translate([0, brdg_len/2, BRDG_TCK])
rotate([90,0,0]) cylinder(h=brdg_len, r=SDDL_RAD);
if (!is_cut && STRTIE_STYLE == 1) {
// string tie block
translate([-1+BRDG_WTH/2, -brdg_len/2, BRDG_TCK-FUSE_SHIFT])
cube([BRDG_WTH/2, brdg_len, SDDL_RAD]);
}
}
if ((HEAD_STYLE==0 || HEAD_STYLE==2 || (HEAD_STYLE==1 && STRTIE_STYLE==2)) && !is_cut) {
// bridge front/back carves
for (x = [-1, 1]) {
translate([x*(SDDL_RAD+cut_rad), brdg_len/2 +1, BRDG_TCK]) {
scale([1, 1, cut_scale])
rotate([90, 0, 0]) cylinder(r=cut_rad, h=brdg_len+2, $fn=2*DEFRES);
}
}
// bridge left/right carves
for (y = [-1, 1]) {
translate([-BRDG_WTH, y*brdg_len/2, BRDG_TCK+SDDL_RAD])
rotate(90,[0,1,0]) cylinder(h=2*BRDG_WTH, r=side_cut_rad, $fn=2*DEFRES);
}
} else if (HEAD_STYLE==1 && !is_cut) {
// bridge back carve
translate([STRTIE_STYLE == 1 ? cut_rad+SDDL_RAD : BRDG_WTH, brdg_len/2 +1, BRDG_TCK]) {
translate([-cut_rad, -brdg_len-2, -FUSE_SHIFT])
cube([cut_rad*2, brdg_len+2, BRDG_TCK]);
scale([1, 1, (STRTIE_STYLE == 1 ? 1.2 : 1)*cut_scale])
rotate([90, 0, 0]) cylinder(r=cut_rad, h=brdg_len+2, $fn=2*DEFRES);
}
if (STRTIE_STYLE != 1) {
// bridge left/right carves
for (y = [-1, 1]) {
translate([-BRDG_WTH, y*brdg_len/2, BRDG_TCK+SDDL_RAD])
rotate(90,[0,1,0]) cylinder(h=2*BRDG_WTH, r=side_cut_rad, $fn=2*DEFRES);
}
if (STRTIE_STYLE == 0) thru_holes();
}
}
// string grooves on top of saddle
if (!is_cut) {
translate([-10, 0, BRDG_TCK +SDDL_RAD +.25*STR_HOLE_RAD])
string_holes(90, brdg_hole_gap, STR_HOLE_RAD, strlen=brdg_hole_gap); // .5);
if (STRTIE_STYLE == 1) {
translate([BRDG_WTH/2, 0, BRDG_TCK +SDDL_RAD])
string_holes(115, brdg_hole_gap, .5);
// groove at back of bridge for string knots
translate([BRDG_WTH, 0, .5*BRDG_TCK])
rotate([90, 0, 0])
translate([0, 0, -BRDG_LEN])