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Add starts parameter to generic_bottle_cap() for multi-start threads #2020

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Add starts parameter to generic_bottle_cap() for multi-start threads #2020

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12 changes: 10 additions & 2 deletions bottlecaps.scad
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Original file line number Diff line number Diff line change
Expand Up @@ -551,6 +551,10 @@ function generic_bottle_neck(
// Description:
// Creates a basic threaded cap given specifications. You must give exactly two of `thread_od`, `neck_od` and `thread_depth` to
// specify the thread geometry. Most glass bottles conform to the SPI standard and caps for them may be more easily produced using {{sp_cap()}}.
// .
// Plastic bottle necks often use multi-start threads, which you can create by setting `starts` to the number of
// thread starts. The starts are spaced evenly around the cap, and `pitch` remains the axial distance between
// adjacent threads, so the lead (the axial travel of one revolution) is `pitch * starts`.
// Arguments:
// wall = Wall thickness. Default: 2
// texture = The surface texture of the cap. Valid values are "none", "knurled", "sharp_knurled", "ribbed", "sharp_ribbed", or "hex_faces". Default: "none"
Expand All @@ -562,6 +566,7 @@ function generic_bottle_neck(
// tolerance = Extra space to add to the outer diameter of threads and neck. Applied to radius. Default: 0.2
// flank_angle = Angle of taper on threads. Default: 15
// pitch = Thread pitch. Default: 2.7
// starts = Number of thread starts. Default: 1
// anchor = Translate so anchor point is at origin (0,0,0). See [anchor](attachments.scad#subsection-anchor). Default: `BOTTOM`
// spin = Rotate this many degrees around the Z axis after anchor. See [spin](attachments.scad#subsection-spin). Default: 0
// orient = Vector to rotate top toward, after spin. See [orient](attachments.scad#subsection-orient). Default: `UP`
Expand All @@ -571,6 +576,7 @@ function generic_bottle_neck(
// generic_bottle_cap(thread_depth=2,neck_od=INCH,height=INCH/2);
// generic_bottle_cap(texture="knurled",neck_od=25,thread_od=30,height=10);
// generic_bottle_cap(texture="ribbed",thread_depth=3,thread_od=25,height=13);
// generic_bottle_cap(texture="knurled",neck_od=34.7,thread_od=37.1,height=9,pitch=3.14,starts=2);
module generic_bottle_cap(
wall = 2,
texture = "none",
Expand All @@ -581,6 +587,7 @@ module generic_bottle_cap(
neck_od,
flank_angle = 15,
pitch = 2.7,
starts = 1,
anchor = BOTTOM,
spin = 0,
orient = UP
Expand Down Expand Up @@ -611,7 +618,8 @@ module generic_bottle_cap(
}
up(wall + pitch / 2) {
thread_helix(d = neckOuterDTol+.02, pitch = pitch, thread_depth = thread_depth+.01, flank_angle = flank_angle,
turns = ((height - pitch) / pitch), lead_in = -thread_depth, internal = true, anchor = BOTTOM);
starts = starts, turns = ((height - pitch) / (pitch * starts)), lead_in = -thread_depth,
internal = true, anchor = BOTTOM);
}
}
children();
Expand All @@ -621,7 +629,7 @@ module generic_bottle_cap(
function generic_bottle_cap(
wall, texture, height,
thread_od, tolerance,
neck_od, flank_angle, pitch,
neck_od, flank_angle, pitch, starts,
anchor, spin, orient
) = no_function("generic_bottle_cap");

Expand Down