Like you can see i design a ring and planet gear. But when i use sweep and twist angle to create the helical type of gear. The inclination does not match even though it has the same angle And i need that to make it works.
I use the same angle in the ring and in the planet 20 degrees but its to different, i try to change that divide but it's still not exact. Somebody can explain me what happen?
Adding a guide rail to the sweep may help it maintain the correct shape.
This thread shows how I made a herringbone (helix) gear a few years ago. It was 3d printed and worked quite well.
ETFrench
Thanks for your answer makes to much sense. But can tell me the specific detail of of the position of the angle that i need to make, I create a copy in another plane with 20 degrees of rotation. im trying but without sucsees.
Hi man, i found another problem like i did i get a straight angle gear but the originals have like a curve. How can i do it, my friend? You dont have a video?
But i found another problem, nobody know how to do it. One side its ok but the other wrong. Lol
The solution my friends after alot of work, create 3 sketch with 15 degrees of differents and use loft. Using this video https://www.youtube.com/watch?v=NDDiYzLuacQ&t=6s
The sweep feature can still be used in this situation, but the twist angle must be calculated from the specified helical angle (α), pitch circle diameter (D), and gear height (H). This is because the definitions of helical angle and twist angle (θ) differ.
Formula:
θ=2⋅arcsin(H⋅tan(θ)/D)
This relationship is derived from the geometric construction shown in the diagram below.
For example:
With α = 20°, H = 6 mm, and D = 8 mm (planet gear), the twist angle θ is 31.7°.
For the ring gear, using the same height (H = 6 mm) but a larger pitch circle diameter (D = 24 mm, to accommodate four planet gears and one sun gear), the twist angle θ is 10.4°.
Of course, all gears must share the same module to mesh properly.
Below is proof of the assembled result and its cross-section view:
As others have mentioned, you can use the GF Gear Generator add-on to automatically generate gears of this type. However, it does not support on-the-fly parameter editing. This means that if you want to try a different gear size, you’ll need to start over—re-doing the alignment, joints, etc.—since nothing is linked. For this reason, I usually prefer to build a simple custom gear component myself. It makes iteration and development much easier later on.
