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Added mate_teeth= and apex named anchor to bevel_gear()

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Garth Minette 2020-10-14 15:37:56 -07:00
parent 775e0c4c48
commit 4fc03b18e6
2 changed files with 11 additions and 12 deletions
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21
involute_gears.scad
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@ -471,24 +471,21 @@ module gear(
// spin = Rotate this many degrees around the Z axis after anchor. See [spin](attachments.scad#spin). Default: `0`
// orient = Vector to rotate top towards, after spin. See [orient](attachments.scad#orient). Default: `UP`
// Extra Anchors:
// "apex" = At the pitch cone apex for the bevel gear.
// "pitchbase" = At the natural height of the pitch radius of the beveled gear.
// "flattop" = At the top of the flat top of the bevel gear.
// Example: Beveled Gear
// bevel_gear(pitch=5, teeth=36, face_width=10, shaft_diam=5, pitch_angle=45, spiral_angle=0);
// Example: Spiral Beveled Gear and Pinion
// t1 = 14;
// t2 = 32;
// a1 = atan(t1/t2);
// a2 = atan(t2/t1);
// down(pitch_radius(5, t1))
// zrot(180/t2) bevel_gear(pitch=5, teeth=t2, face_width=10, shaft_diam=6, pitch_angle=a2, left_handed=true, slices=8, orient=UP);
// back(pitch_radius(5, t2))
// bevel_gear(pitch=5, teeth=t1, face_width=10, shaft_diam=6, pitch_angle=a1, slices=8, orient=FWD);
// t1 = 16; t2 = 28;
// bevel_gear(pitch=5, teeth=t1, mate_teeth=t2, slices=12, anchor="apex", orient=FWD);
// bevel_gear(pitch=5, teeth=t2, mate_teeth=t1, left_handed=true, slices=12, anchor="apex", spin=180/t2);
module bevel_gear(
pitch = 3,
teeth = 11,
face_width = 6,
face_width = 10,
pitch_angle = 45,
mate_teeth = undef,
shaft_diam = 3,
hide = 0,
PA = 20,
@ -504,6 +501,7 @@ module bevel_gear(
orient = UP
) {
slices = cutter_radius==0? 1 : slices;
pitch_angle = is_undef(mate_teeth)? pitch_angle : atan(teeth/mate_teeth);
pr = pitch_radius(pitch, teeth);
rr = root_radius(pitch, teeth, clearance, interior);
pitchoff = (pr-rr) * cos(pitch_angle);
@ -535,7 +533,7 @@ module bevel_gear(
let(
u = polar.y / ocone_rad,
m = up((1-u) * pr / tan(pitch_angle)) *
up(2*pitchoff) *
up(pitchoff) *
zrot(polar.x/sin(pitch_angle)) *
back(u * pr) *
xrot(pitch_angle) *
@ -576,7 +574,8 @@ module bevel_gear(
vnf = left_handed? vnf1 : xflip(p=vnf1);
anchors = [
anchorpt("pitchbase", [0,0,pitchoff-thickness/2]),
anchorpt("flattop", [0,0,thickness/2])
anchorpt("flattop", [0,0,thickness/2]),
anchorpt("apex", [0,0,hyp_ang_to_opp(ocone_rad,90-pitch_angle)+pitchoff-thickness/2])
];
attachable(anchor,spin,orient, vnf=vnf, extent=true, anchors=anchors) {
difference() {

2
version.scad
View file

@ -8,7 +8,7 @@
//////////////////////////////////////////////////////////////////////
BOSL_VERSION = [2,0,448];
BOSL_VERSION = [2,0,449];
// Section: BOSL Library Version Functions