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fix backlash for gear_dist on internal gears

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This commit is contained in:
Adrian Mariano 2023-08-08 19:33:03 -04:00
parent cc3b679ffa
commit ac6cc19775
1 changed files with 3 additions and 1 deletions
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4
gears.scad
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@ -3233,6 +3233,7 @@ function gear_dist(
assert(teeth1>0 || teeth2>0, "One of the teeth counts must be nonzero")
assert(is_bool(internal1))
assert(is_bool(internal2))
assert(is_finite(helical))
assert(!(internal1&&internal2), "Cannot specify both gears as internal")
assert(!(internal1 || internal2) || (teeth1>0 && teeth2>0), "Cannot specify internal gear with rack (zero tooth count)")
let(
@ -3254,7 +3255,8 @@ function gear_dist(
pa_eff = _working_pressure_angle(teeth1,profile_shift1,teeth2,profile_shift2,pressure_angle,helical),
pa_transv = atan(tan(pressure_angle)/cos(helical))
)
mod*(teeth1+teeth2)*cos(pa_transv)/cos(pa_eff)/cos(helical)/2 + backlash*cos(helical)/tan(pressure_angle);
mod*(teeth1+teeth2)*cos(pa_transv)/cos(pa_eff)/cos(helical)/2
+ (internal1||internal2?-1:1) * backlash*cos(helical)/tan(pressure_angle);
function _invol(a) = tan(a) - a*PI/180;