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Added involute_gear_od() function.

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Chris Palmer 2020-07-28 21:24:01 +01:00
parent e6a26bc7b1
commit fb41f218fe
2 changed files with 4 additions and 0 deletions
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readme.md
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@ -5254,6 +5254,7 @@ The origin of the rack is the left end of the pitch line and its width is below
|:--- |:--- |
| ```centre_distance(m, z1, z2, pa = 20)``` | Calculate distance between centres taking profile shift into account |
| ```involute(r, u)``` | Involute of circle radius r at angle u in radians |
| ```involute_gear_od(m, z, pa = 20)``` | involute gear outside diameter given modulus, tooth count and pressure angle |
| ```involute_rack_tooth_profile(m, pa = 20, clearance = undef)``` | Calculate rack tooth profile given module and pressure angle |
| ```involute_worm_profile(m, pa = 20, clearance = undef)``` | Calculate worm profile suitable for passing to thread() |
| ```profile_shift(z, pa)``` | Calculate profile shift for small gears |

3
utils/gears.scad
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@ -46,6 +46,9 @@ function profile_shift(z, pa) = z ? max(1 - z * sqr(sin(pa)) / 2, 0) : 0; //! Ca
function centre_distance(m, z1, z2, pa = 20) = //! Calculate distance between centres taking profile shift into account
let(x1 = profile_shift(z1, pa), x2 = profile_shift(z2, pa)) m * (z1/2 + z2/2 + x1 + x2);
function involute_gear_od(m, z, pa = 20) = //! involute gear outside diameter given modulus, tooth count and pressure angle
m * (z + 2 * profile_shift(z, pa) + 2);
module involute_gear_profile(m, z, pa = 20, clearance = undef, steps = 20) { //! Calculate gear profile given module, number of teeth and pressure angle
assert(z >= 7, "Gears must have at least 7 teeth.");
d = m * z; // Reference pitch circle diameter