planetary reduction gear

chand_basha

hi,
i have designed this planetary gearing mechanism, in this the ring is fixed. the in put is sun gear and the out put is planet carrier. when i am trying to give mating the animation is looking intersected. so help me how to give mating b/w fixed ring gear and revolving planet gear 

mahir

Here's a link to a functional example.
https://cad.onshape.com/documents/afef36773400edbb60adf7ef/w/293214089ddddea9f823d1af/e/165a47a6e04f9af368a00b09

mahir

Here's a fixed version of your assembly. I just had to adjust some of the mate connector alignments.
https://cad.onshape.com/documents/cd8786a0636b6a309c217ba3/w/8ed6d9586b8e414e2c0376df/e/4b47896360c019f96f350cbe

chand_basha

here the link is https://cad.onshape.com/documents/1fa61d7170a83151a52a0a08/w/8ab15e2e2d07991e09eed0de/e/60ec06eb1e6edffd6107628f

mahir

Your document is view only, so I can't copy and fix it. But you should be able to take care of it yourself pretty easily. You'll need to delete the fastened mates for each planet gear and replace it with a revolute mate. Then the correct starting position can be edited by rotating the mate connector for each planet gear as required.

chand_basha

yes sir, actually i used ball bearings there for ball bearings i used fastened mate, but from bearing to planet i used revolute only. And another thing is while i am giving mating i am adjusting the gear teethes properly, even though  it is shifting when it comes to animation 

https://cad.onshape.com/documents/1fa61d7170a83151a52a0a08/w/8ab15e2e2d07991e09eed0de/e/60ec06eb1e6edffd6107628f

mahir

The only part that should be fixed/fastened is the outer ring. Every other part has to rotate relative to its neighbors. This is how I would organize the mates:

1. Fixed outer ring
2. Revolute mate on sun gear relative to outer ring
3. Revolute mate on carrier relative to carrier
4. 3X Revolute mate on planet gear relative to carrier
5. Adjust the zero point of all the revolute mates by adjusting the X-axis alignment of the individual mate connectors. This might be more easily done if you add the mate connectors ahead of time. All the gears should mesh properly when all 5 revolute mates are set to 0deg.
6. Now that you have a proper starting point, add all the gear relations.
     Sun gear to carrier
     1X planet gear to carrier (or sun gear)
     2X planet gear to planet gear (just a 1:1 ratio to the planet gear that is driven by the sun/carrier)

mahir

Here's a link to a functional example.
https://cad.onshape.com/documents/afef36773400edbb60adf7ef/w/293214089ddddea9f823d1af/e/165a47a6e04f9af368a00b09

ethan_1

https://forum.onshape.com/discussion/4280/planetary-gear-mates


This should explain everything

chand_basha

yes sir, actually i used ball bearings there for ball bearings i used fastened mate, but from bearing to planet i used revolute only. And another thing is while i am giving mating i am adjusting the gear teethes properly, even though  it is shifting when it comes to animation

chand_basha

Thanks you all  for your support

chand_basha

hi sir, here again i got some problem. i followed the same path which was there in your video, even though the planet teeth and ring teeth are not meshing properly
https://cad.onshape.com/documents/d99fefa5f3f11705853847ec/w/1da1f2ac6c849c9170fa6cec/e/4e9352615b50d2e620d480c5

mahir

Here's a fixed version of your assembly. I just had to adjust some of the mate connector alignments.
https://cad.onshape.com/documents/cd8786a0636b6a309c217ba3/w/8ed6d9586b8e414e2c0376df/e/4b47896360c019f96f350cbe

chand_basha

Thanks a lot sir

chand_basha

sir could you please tell me what adjustments you made in this, so that i will get an idea on this.

mahir

Take a look at my link above. As I said, I adjusted the alignment of some of the mate connectors, starting with matching the planet gears to the outer ring, and then matching the sun gear to the planet gears.

chand_basha

i am not getting this one sir, i think in my system mate connectors are not working properly as because it for education purpose only. and here i am fixing carrier this time
 https://cad.onshape.com/documents/933b7b93dcd1aa2bae75a3b4/w/c7260aa152d18de55edcd616/e/c72cb41f04f1a34129260403

mahir

Whatever works for you. You just have to adjust the relative alignment so the gears mesh. Whether that's by rotating the two gears or by rotating the carrier and a gear... it doesn't matter. As for the educational license, it also doesn't make a difference. Educational licenses don't have different modeling or assembly functionality.

chand_basha

ok. but for me when i change the value for rotation about z axis only mates are changing, but gear is not rotating according to that value.

mahir

Sorry, I don't understand what you're saying. I can't see your screen, so I suggest you just open my file (linked above), copy the workspace, and inspect each mate and mate connector to see what was done. Good luck.

chand_basha

It's OK sir, Now I edited that one properly. Previously I was creating explicit mate connectors and i was editing those. so that is why I was not getting proper results. now i made it. Thanks for your support for such a long time