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Added clearance parameter for nut, bolt and tap + 32-UN-1 thread #56

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Added clearance parameter for nut, bolt and tap + 32-UN-1 thread #56

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12ccfbf
added 32-UN-1 thread
olivier-boesch Sep 29, 2021
57bcab1
added clearance paramter
olivier-boesch Sep 29, 2021
e7a9f91
added height parameter
olivier-boesch Sep 29, 2021
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2 changes: 2 additions & 0 deletions THREAD_TABLE.scad
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Original file line number Diff line number Diff line change
Expand Up @@ -1827,4 +1827,6 @@ THREAD_TABLE = [["G1/16-ext", [0.907, 3.1631, 6.3625, [[0, -0.4252], [0, 0.4252]
["32-UN-3/4-int", [0.79375, -9.5551, 19.1033, [[0, 0.3473], [0, -0.3473], [0.4296, -0.0992], [0.4296, 0.0992]]]],
["32-UN-13/16-ext", [0.79375, 9.8517, 19.7103, [[0, -0.2977], [0, 0.2977], [0.4296, 0.0496], [0.4296, -0.0496]]]],
["32-UN-13/16-int", [0.79375, -10.3492, 20.6914, [[0, 0.3473], [0, -0.3473], [0.4296, -0.0992], [0.4296, 0.0992]]]],
["32-UN-1-ext", [0.79375, 12.2319, 24.4707, [[0, -0.2977], [0, 0.2977], [0.4296, 0.0496], [0.4296, -0.0496]]]],
["32-UN-1-int", [0.79375, -12.7312, 25.4556, [[0, 0.3473], [0, -0.3473], [0.4296, -0.0992], [0.4296, 0.0992]]]]
];
35 changes: 19 additions & 16 deletions threadlib.scad
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Expand Up @@ -14,6 +14,8 @@ function __THREADLIB_VERSION() = 0.3;
use <thread_profile.scad>
include <THREAD_TABLE.scad>

bolt("M6", height=2.8, tol=0);

function thread_specs(designator, table=THREAD_TABLE) =
/* Returns thread specs of thread-type 'designator' as a vector of
[pitch, Rrotation, Dsupport, section_profile] */
Expand All @@ -24,56 +26,57 @@ function thread_specs(designator, table=THREAD_TABLE) =
// verify that we found something and return it:
assert(!is_undef(specs), str("Designator: '", designator, "' not found")) specs;

module thread(designator, turns, higbee_arc=20, fn=120, table=THREAD_TABLE)
module thread(designator, turns, higbee_arc=20, fn=120, table=THREAD_TABLE, tol=0)
{
specs = thread_specs(designator, table=table);
P = specs[0]; Rrotation = specs[1]; section_profile = specs[3];
P = specs[0]; Rrotation = specs[1]-tol; section_profile = specs[3];
straight_thread(
section_profile=section_profile,
higbee_arc=higbee_arc,
r=Rrotation,
turns=turns,
fn=fn,
pitch=P);
pitch=P, fn=fn); // added fn for this function : smoother thread
}

module bolt(designator, turns, higbee_arc=20, fn=120, table=THREAD_TABLE) {
module bolt(designator, turns, height=0, higbee_arc=20, fn=120, table=THREAD_TABLE, tol=0) {
union() {
specs = thread_specs(str(designator, "-ext"), table=table);
P = specs[0]; Dsupport = specs[2];
turns=turns?turns:height/P;
H = (turns + 1) * P;
thread(str(designator, "-ext"), turns=turns, higbee_arc=higbee_arc, fn=fn, table=table);
thread(str(designator, "-ext"), turns=turns, higbee_arc=higbee_arc, fn=fn, table=table, tol=tol);
translate([0, 0, -P / 2])
cylinder(h=H, d=Dsupport, $fn=fn);
cylinder(h=H, d=Dsupport-2*tol, $fn=fn);
};
};

module nut(designator, turns, Douter, higbee_arc=20, fn=120, table=THREAD_TABLE) {
module nut(designator, turns, height=0, Douter, higbee_arc=20, fn=120, table=THREAD_TABLE, tol=0.0) {
union() {
specs = thread_specs(str(designator, "-int"), table=table);
P = specs[0]; Dsupport = specs[2];
P = specs[0]; Dsupport = specs[2] + tol;
turns=turns?turns:height/P;
H = (turns + 1) * P;
thread(str(designator, "-int"), turns=turns, higbee_arc=higbee_arc, fn=fn, table=table);
thread(str(designator, "-int"), turns=turns, higbee_arc=higbee_arc, fn=fn, table=table, tol=tol);

translate([0, 0, -P / 2])
difference() {
cylinder(h=H, d=Douter, $fn=fn);
translate([0, 0, -0.1])
cylinder(h=H+0.2, d=Dsupport, $fn=fn);
cylinder(h=H+0.2, d=Dsupport+tol, $fn=fn);
};
};
};

module tap(designator, turns, higbee_arc=20, fn=120, table=THREAD_TABLE) {
module tap(designator, turns, height=0, higbee_arc=20, fn=120, table=THREAD_TABLE, tol=0.0) {
difference() {
specs = thread_specs(str(designator, "-int"), table=table);
P = specs[0]; Dsupport = specs[2];
H = (turns + 1) * P;

turns=turns?turns:height/P;
H = (turns + 1) * P;
translate([0, 0, -P / 2]) {
cylinder(h=H, d=Dsupport, $fn=fn);
cylinder(h=H, d=Dsupport+2*tol, $fn=fn);
};

thread(str(designator, "-int"), turns=turns, higbee_arc=higbee_arc, fn=fn, table=table);
thread(str(designator, "-int"), turns=turns, higbee_arc=higbee_arc, fn=fn, table=table, tol=tol);
};
}