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internal threads => negative radius of rotation

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user does not need to rotate internal threads by 180 deg anymore
to fit external thread. nut module also does not need to rotate
anymore
This commit is contained in:
Adrian Schlatter
2019-04-14 16:45:34 +02:00
parent 46fcbc9395
commit e4faa5ab0c
4 changed files with 555 additions and 529 deletions
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1046
THREAD_TABLE.scad
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design/threads.xlsx
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35
tests/test_table.awk
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@@ -58,8 +58,8 @@ BEGIN {
parse();
m1 = slope(v3, v0) / deg;
m2 = slope(v1, v2) / deg;
if (m1 > 60 + dphi || m1 < 60 - dphi \
|| m2 < -60 - dphi || m2 > -60 + dphi)
if (m1 > -60 + dphi || m1 < -60 - dphi \
|| m2 < 60 - dphi || m2 > 60 + dphi)
print designator " FAIL: " m1 ", " m2 " deg";
test_horizontal();
tested = 1;
@@ -82,8 +82,34 @@ BEGIN {
parse();
m1 = slope(v3, v0) / deg;
m2 = slope(v1, v2) / deg;
if (m1 > 62.5 + dphi || m1 < 62.5 - dphi \
|| m2 < -62.5 - dphi || m2 > -62.5 + dphi)
if (m1 > -62.5 + dphi || m1 < -62.5 - dphi \
|| m2 < 62.5 - dphi || m2 > 62.5 + dphi)
print designator " FAIL: " m1 ", " m2 " deg";
test_horizontal();
tested = 1;
}
/PCO.+-ext/ {
# PCO-1881 threads have slopes of -80 deg (on the load side) and 70 deg
# (on the other side) + horizontal crest / valley
parse();
m1 = slope(v0, v3) / deg;
m2 = slope(v2, v1) / deg;
if (m1 > 70 + dphi || m1 < 70 - dphi \
|| m2 < -80 - dphi || m2 > -80 + dphi)
print designator " FAIL: " m1 ", " m2 " deg";
test_horizontal();
tested = 1;
}
/PCO.+-int/ {
# PCO-1881 threads have slopes of 80 deg (on the load side) and -70 deg
# (on the other side) + horizontal crest / valley
parse();
m1 = slope(v3, v0) / deg;
m2 = slope(v1, v2) / deg;
if (m1 > -70 + dphi || m1 < -70 - dphi \
|| m2 < 80 - dphi || m2 > 80 + dphi)
print designator " FAIL: " m1 ", " m2 " deg";
test_horizontal();
tested = 1;
@@ -97,3 +123,4 @@ BEGIN {
print designator " FAIL: not tested";
};
}

3
threadlib.scad
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@@ -49,8 +49,7 @@ module nut(designator, turns, Douter, higbee_arc=20, fn=120, table=THREAD_TABLE)
specs = thread_specs(str(designator, "-int"), table=table);
P = specs[0]; Dsupport = specs[2];
H = (turns + 1) * P;
rotate(180)
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);
translate([0, 0, -P / 2])
difference() {