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Rack profile shift bugfix for tooth rounding.

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Revar Desmera 2023-07-31 14:15:31 -07:00
parent 4283b0b454
commit 3878f4fc6d
1 changed files with 3 additions and 2 deletions
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5
gears.scad
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@ -1375,7 +1375,8 @@ function rack2d(
) = let( ) = let(
pitch = _inherit_gear_pitch("rack2d()",pitch, circ_pitch, diam_pitch, mod, warn=false), pitch = _inherit_gear_pitch("rack2d()",pitch, circ_pitch, diam_pitch, mod, warn=false),
PA = _inherit_gear_pa(pressure_angle), PA = _inherit_gear_pa(pressure_angle),
helical = _inherit_gear_helical(helical) helical = _inherit_gear_helical(helical),
mod = module_value(circ_pitch=pitch)
) )
assert(is_integer(teeth) && teeth>0) assert(is_integer(teeth) && teeth>0)
assert(is_finite(PA) && PA>=0 && PA<90, "Bad pressure_angle value.") assert(is_finite(PA) && PA>=0 && PA<90, "Bad pressure_angle value.")
@ -1388,6 +1389,7 @@ function rack2d(
let( let(
adendum = _adendum(pitch, profile_shift), adendum = _adendum(pitch, profile_shift),
dedendum = _dedendum(pitch, clearance, profile_shift), dedendum = _dedendum(pitch, clearance, profile_shift),
clear = default(clearance, 0.25 * mod),
bottom = is_def(bottom) ? bottom = is_def(bottom) ?
assert(is_finite(bottom) && bottom>dedendum, "bottom is invalid or too small for teeth") assert(is_finite(bottom) && bottom>dedendum, "bottom is invalid or too small for teeth")
bottom bottom
@ -1406,7 +1408,6 @@ function rack2d(
l = teeth * trans_pitch, l = teeth * trans_pitch,
ax = ang_adj_to_opp(trans_pa, adendum), ax = ang_adj_to_opp(trans_pa, adendum),
dx = ang_adj_to_opp(trans_pa, dedendum), dx = ang_adj_to_opp(trans_pa, dedendum),
clear = dedendum - adendum,
poff = tthick/2 - backlash, poff = tthick/2 - backlash,
tooth = [ tooth = [
[-trans_pitch/2, -dedendum], [-trans_pitch/2, -dedendum],