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backlash fixes

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This commit is contained in:
Adrian Mariano 2023-08-10 22:56:50 -04:00
parent 6c01ef99a0
commit 853d2e3983
1 changed files with 9 additions and 4 deletions
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13
gears.scad
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@ -2177,7 +2177,7 @@ function worm(
for (t = xcopies(trans_pitch, n=2*ceil(l/trans_pitch)+1))
each apply(t, tooth)
],
steps = max(36, segs(d/2)),
steps = max(36, segs(d/2))*4,
step = 360 / steps,
zsteps = ceil(l / trans_pitch / starts * steps),
zstep = l / zsteps,
@ -3179,7 +3179,10 @@ function worm_dist(d,starts,teeth,mod,profile_shift=0,diam_pitch,circ_pitch,pres
lead_angle = asin(mod*starts/d),
pitch_diam = mod*teeth/cos(lead_angle)
)
(d+pitch_diam)/2 + profile_shift*mod + backlash * (cos(lead_angle)+cos(90-lead_angle)) / tan(pressure_angle);
(d+pitch_diam)/2 + profile_shift*mod
// + backlash * (cos(lead_angle)+cos(90-lead_angle)) / tan(pressure_angle);
// + backlash * cos(45-lead_angle) / tan(pressure_angle);
+ backlash * cos(lead_angle) / tan(pressure_angle);
@ -3350,8 +3353,10 @@ function gear_dist_skew(teeth1,teeth2,helical1,helical2,profile_shift1,profile_s
pa_normal_eff = _working_normal_pressure_angle_skew(teeth1,profile_shift1,helical1,teeth2,profile_shift2,helical2,pressure_angle),
dist_adj = 0.5*(teeth1/cos(helical1)^3+teeth2/cos(helical2)^3)*(cos(pressure_angle)/cos(pa_normal_eff)-1)
)
mod*(teeth1/2/cos(helical1)+teeth2/2/cos(helical2)+dist_adj)
+ backlash * (cos(helical1+helical2)) / tan(pressure_angle);
mod*(teeth1/2/cos(helical1)+teeth2/2/cos(helical2)+dist_adj)
// This expression is a guess based on finding the cross section where pressure angles match so that there is a single
// pressure angle to reference the movement by.
+ backlash * cos((helical1-helical2)/2) / tan(pressure_angle);
function _working_normal_pressure_angle_skew(teeth1,profile_shift1,helical1, teeth2, profile_shift2, helical2, pressure_angle) =