grey/BOSL2
1
0
Fork 0
mirror of https://github.com/BelfrySCAD/BOSL2.git synced 2025-01-01 09:49:45 +00:00
Code Issues Projects Releases Packages Wiki Activity Actions

add worm_dist

Browse source
This commit is contained in:
Adrian Mariano 2023-08-08 23:05:45 -04:00
parent 2b0ab111f1
commit ada1a2e3fc
1 changed files with 36 additions and 2 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

38
gears.scad
View file

@ -2233,6 +2233,7 @@ module worm(
assert(is_finite(gear_spin))
assert(is_finite(profile_shift) && abs(profile_shift)<1);
helical = asin(starts * circ_pitch / PI / d);
fda= echo(helical=helical);
trans_pitch = circ_pitch / cos(helical);
vnf = worm(
circ_pitch=circ_pitch,
@ -2369,6 +2370,7 @@ function worm_gear(
pr = pitch_radius(circ_pitch, teeth,helical),
hob_rad = worm_diam / 2 + crowning,
thickness = worm_gear_thickness(circ_pitch=circ_pitch, teeth=teeth, worm_diam=worm_diam, worm_arc=worm_arc, crowning=crowning, clearance=clearance),
dfda=echo("------->"),
tooth_profile = _gear_tooth_profile(
circ_pitch=circ_pitch,
teeth=teeth,
@ -2379,6 +2381,7 @@ function worm_gear(
profile_shift=profile_shift,
center=true
),
feeg=echo("<----------"),
tbot = min(column(tooth_profile,1)),
arcthick = hob_rad * sin(worm_arc/2) * 2,
twist = sin(helical)*arcthick / (2*PI*pr) * 360,
@ -2566,7 +2569,8 @@ function _gear_tooth_profile(
prad = pitch_radius(circ_pitch, teeth, helical=helical),
brad = _base_radius(circ_pitch, teeth, pressure_angle, helical=helical),
rrad = _root_radius(circ_pitch, teeth, clearance, helical=helical, profile_shift=profile_shift, internal=internal),
fgdg= echo(pitchrad=prad,outerrad=arad,rootrad=rrad),
srad = max(rrad,brad),
tthick = circ_pitch/PI / cos(helical) * (PI/2 + 2*profile_shift * tan(pressure_angle)) + (internal?backlash:-backlash),
tang = tthick / prad / 2 * 180 / PI,
@ -3153,12 +3157,42 @@ function worm_gear_thickness(circ_pitch, teeth, worm_diam, worm_arc=60, crowning
) thickness;
// Function: worm_dist()
// Synopsis: Returns the distance between a worm and a worm gear
// Topics: Gears, Parts
// See Also: worm(), worm_gear(), pitch_radius(), outer_radius()
// Usage:
// dist = worm_dist(mod=|diam_pitch=|circ_pitch=, d, starts, teeth, [profile_shift], [pressure_angle=]);
// Description:
// Calculate the distance between the centers of a worm and its mating worm gear, taking account
// possible profile shifting of the worm gear.
// Arguments:
// d = diameter of worm
// starts = number of starts of worm
// teeth = number of teeth on worm gear
// profile_shift = profile shift of worm gear
// ---
// 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.
// circ_pitch = distance between teeth around the pitch circle.
// pressure_angle = The pressure angle of the gear.
function worm_dist(d,starts,teeth,mod,profile_shift=0,diam_pitch,circ_pitch,pressure_angle=20) =
let(
mod = module_value(mod=mod,diam_pitch=diam_pitch,circ_pitch=circ_pitch),
lead_angle = asin(mod*starts/d),
pitch_diam = mod*teeth/cos(lead_angle)
)
(d+pitch_diam)/2 + profile_shift*mod;
// Function: gear_dist()
// Synopsis: Returns the distance between two gear centers for spur gears or parallel axis helical gears.
// Topics: Gears, Parts
// See Also: worm(), worm_gear(), pitch_radius(), outer_radius()
// Usage:
// dist = gear_dist(mod=|diam_pitch=|circ_pitch=, teeth1, teeth2, [helical], [profile_shift1], [profile_shift2], [pressure_angle=]);
// dist = gear_dist(mod=|diam_pitch=|circ_pitch=, teeth1, teeth2, [helical], [profile_shift1], [profile_shift2], [pressure_angle=], [backlash=]);
// Description:
// Calculate the distance between the centers of two spur gears gears or helical gears with parallel axes,
// taking into account profile shifting and helical angle. You can give the helical angle as either positive or negative.