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Implemented herringbone racks.

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Revar Desmera 2023-07-31 18:37:15 -07:00
parent fbfcd4ab74
commit 406c18afaf
1 changed files with 48 additions and 23 deletions
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71
gears.scad
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@ -1232,6 +1232,7 @@ module ring_gear2d(
// mod = The metric module/modulus of the gear, or mm of pitch diameter per tooth. // mod = The metric module/modulus of the gear, or mm of pitch diameter per tooth.
// diam_pitch = The diametral pitch, or number of teeth per inch of pitch diameter. Note that the diametral pitch is a completely different thing than the pitch diameter. // diam_pitch = The diametral pitch, or number of teeth per inch of pitch diameter. Note that the diametral pitch is a completely different thing than the pitch diameter.
// helical = The angle of the rack teeth away from perpendicular to the rack length. Used to match helical spur gear pinions. Default: 0 // helical = The angle of the rack teeth away from perpendicular to the rack length. Used to match helical spur gear pinions. Default: 0
// herringbone = If true, and helical is set, creates a herringbone rack.
// profile_shift = Profile shift factor x. // profile_shift = Profile shift factor x.
// pressure_angle = Controls how straight or bulged the tooth sides are. In degrees. Default: 20 // pressure_angle = Controls how straight or bulged the tooth sides are. In degrees. Default: 20
// backlash = Gap between two meshing teeth, in the direction along the circumference of the pitch circle. Default: 0 // backlash = Gap between two meshing teeth, in the direction along the circumference of the pitch circle. Default: 0
@ -1289,8 +1290,9 @@ module rack(
backlash = 0.0, backlash = 0.0,
clearance, clearance,
helical, helical,
herringbone = false,
profile_shift = 0, profile_shift = 0,
gear_travel=0, gear_travel = 0,
circ_pitch, circ_pitch,
diam_pitch, diam_pitch,
mod, mod,
@ -1309,7 +1311,7 @@ module rack(
assert(clearance==undef || (is_finite(clearance) && clearance>=0)) assert(clearance==undef || (is_finite(clearance) && clearance>=0))
assert(is_finite(backlash) && backlash>=0) assert(is_finite(backlash) && backlash>=0)
assert(is_finite(helical) && abs(helical)<90) assert(is_finite(helical) && abs(helical)<90)
//assert(is_bool(herringbone)) assert(is_bool(herringbone))
assert(is_finite(profile_shift) && abs(profile_shift)<1) assert(is_finite(profile_shift) && abs(profile_shift)<1)
assert(is_finite(gear_travel)); assert(is_finite(gear_travel));
trans_pitch = pitch / cos(helical); trans_pitch = pitch / cos(helical);
@ -1341,18 +1343,36 @@ module rack(
size = [l, thickness, 2*bottom]; size = [l, thickness, 2*bottom];
attachable(anchor,spin,orient, size=size, anchors=anchors) { attachable(anchor,spin,orient, size=size, anchors=anchors) {
right(gear_travel) right(gear_travel)
skew(sxy=-tan(helical)) xrot(90) { xrot(90) {
linear_extrude(height=thickness, center=true, convexity=teeth*2) { if (herringbone) {
rack2d( zflip_copy()
pitch = pitch, skew(axz=-helical) down(0.01)
teeth = teeth, linear_extrude(height=thickness/2, center=false, convexity=teeth*2) {
bottom=bottom, rack2d(
pressure_angle = PA, pitch = pitch,
backlash = backlash, teeth = teeth,
clearance = clearance, bottom = bottom,
helical = helical, pressure_angle = PA,
profile_shift = profile_shift backlash = backlash,
); clearance = clearance,
helical = helical,
profile_shift = profile_shift
);
}
} else {
skew(axz=helical)
linear_extrude(height=thickness, center=true, convexity=teeth*2) {
rack2d(
pitch = pitch,
teeth = teeth,
bottom = bottom,
pressure_angle = PA,
backlash = backlash,
clearance = clearance,
helical = helical,
profile_shift = profile_shift
);
}
} }
} }
children(); children();
@ -1369,11 +1389,12 @@ function rack(
backlash = 0.0, backlash = 0.0,
clearance, clearance,
helical, helical,
herringbone = false,
profile_shift = 0, profile_shift = 0,
circ_pitch, circ_pitch,
diam_pitch, diam_pitch,
mod, mod,
gear_travel=0, gear_travel = 0,
anchor = CENTER, anchor = CENTER,
spin = 0, spin = 0,
orient = UP orient = UP
@ -1390,7 +1411,7 @@ function rack(
assert(clearance==undef || (is_finite(clearance) && clearance>=0)) assert(clearance==undef || (is_finite(clearance) && clearance>=0))
assert(is_finite(backlash) && backlash>=0) assert(is_finite(backlash) && backlash>=0)
assert(is_finite(helical) && abs(helical)<90) assert(is_finite(helical) && abs(helical)<90)
//assert(is_bool(herringbone)) assert(is_bool(herringbone))
assert(is_finite(profile_shift) && abs(profile_shift)<1) assert(is_finite(profile_shift) && abs(profile_shift)<1)
assert(is_finite(gear_travel)) assert(is_finite(gear_travel))
let( let(
@ -1411,19 +1432,23 @@ function rack(
path = rack2d( path = rack2d(
pitch = pitch, pitch = pitch,
teeth = teeth, teeth = teeth,
bottom=bottom, bottom = bottom,
pressure_angle = PA, pressure_angle = PA,
backlash = backlash, backlash = backlash,
clearance = clearance, clearance = clearance,
helical = helical, helical = helical,
profile_shift = profile_shift profile_shift = profile_shift
), ),
vnf = linear_sweep(path, height=thickness, anchor="origin", orient=FWD), vnf = herringbone
m = product([ ? sweep(path, [
right(gear_travel), left(adj_ang_to_opp(thickness/2,helical)) *
if (helical) skew(sxy=-tan(helical)) back(thickness/2) * xrot(90),
]), xrot(90),
out = apply(m, vnf), left(adj_ang_to_opp(thickness/2,helical)) *
fwd(thickness/2) * xrot(90),
], style="alt", orient=FWD)
: skew(axy=-helical, p=linear_sweep(path, height=thickness, anchor="origin", orient=FWD)),
out = right(gear_travel, p=vnf),
size = [l, thickness, 2*bottom], size = [l, thickness, 2*bottom],
anchors = [ anchors = [
named_anchor("tip", [0,0,a], BACK), named_anchor("tip", [0,0,a], BACK),