Hey everyone,

I bought some geared rotational stages from a company on AliExpress and I'm 99% sure they sent the wrong ones but there are no markings to be able to tell. Two should have a gear ratio of 90:1 and one should have a gear ratio of 180:1. The company is refusing to take responsibility and I just want to check I'm not going mad and completely wrong here.

Correct me if I'm wrong but a 90:1 gear ratio should move at double the speed of a 180:1, correct? Meaning after one full turn the 90:1 would move double as much. I recorded a couple videos to prove this but they're saying otherwise. These are the videos:

https://squaremountain.co.uk/wp-cont...ion-Part-1.mp4

https://squaremountain.co.uk/wp-cont...ion-Part-2.mp4

Thanks