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Enable trapezpoidal vs rounded racks.

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Revar Desmera 2023-07-19 02:52:10 -07:00
parent 3afde4f677
commit 535a14f6a6
1 changed files with 23 additions and 19 deletions
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42
gears.scad
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@ -1009,7 +1009,9 @@ function rack(
// backlash = Gap between two meshing teeth, in the direction along the circumference of the pitch circle
// clearance = Clearance gap at the bottom of the inter-tooth valleys.
// helical = The angle of the rack teeth away from perpendicular to the rack length. Stretches out the tooth shapes. Used to match helical spur gear pinions. Default: 0
// profile_shift = Profile shift factor x.
// profile_shift = Profile shift factor x for tooth shape.
// gear_travel = The distance the rack should be moved by linearly. Default: 0
// rounding = If true, rack tips and valleys are slightly rounded. Default: true
// 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.
// mod = The metric module/modulus of the gear, or mm of pitch diameter per tooth.
// anchor = Translate so anchor point is at origin (0,0,0). See [anchor](attachments.scad#subsection-anchor). Default: `CENTER`
@ -1040,6 +1042,7 @@ function rack2d(
diam_pitch,
mod,
gear_travel = 0,
rounding = true,
anchor = CENTER,
spin = 0
) = let(
@ -1057,29 +1060,30 @@ function rack2d(
l = teeth * trans_pitch,
ax = ang_adj_to_opp(trans_pa, adendum),
dx = ang_adj_to_opp(trans_pa, dedendum),
clear = dedendum - adendum,
poff = tthick/2 - backlash,
tooth = [
[-trans_pitch/2, -dedendum],
each arc(n=4, r=dedendum-adendum, corner=[
if (rounding) each arc(n=4, r=clear, corner=[
[-trans_pitch/2, -dedendum],
[-poff-dx, -dedendum],
[-poff+ax, +adendum],
]),
each arc(n=4, r=trans_pitch/16, corner=[
[-poff-dx, -dedendum],
[-poff+ax, +adendum],
[+poff-ax, +adendum],
]),
each arc(n=4, r=trans_pitch/16, corner=[
[-poff+ax, +adendum],
[+poff-ax, +adendum],
[+poff+dx, -dedendum],
]),
each arc(n=4, r=dedendum-adendum, corner=[
[+poff-ax, +adendum],
[+poff+dx, -dedendum],
[-poff-dx, -dedendum],
[-poff+ax, +adendum],
]) else [-poff-dx, -dedendum],
if (rounding) each arc(n=4, r=trans_pitch/16, corner=[
[-poff-dx, -dedendum],
[-poff+ax, +adendum],
[+poff-ax, +adendum],
]) else [-poff+ax, +adendum],
if (rounding) each arc(n=4, r=trans_pitch/16, corner=[
[-poff+ax, +adendum],
[+poff-ax, +adendum],
[+poff+dx, -dedendum],
]) else [+poff-ax, +adendum],
if (rounding) each arc(n=4, r=clear, corner=[
[+poff-ax, +adendum],
[+poff+dx, -dedendum],
[+trans_pitch/2, -dedendum],
]),
]) else [+poff+dx, -dedendum],
[+trans_pitch/2, -dedendum],
],
path2 = [