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  1. #1
    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

  2. #2
    Quote Originally Posted by mbridge87 View Post
    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
    That looks correct to me. Can you alter the software to suite?
    ..Clive
    The more you know, The better you know, How little you know

  3. #3
    Not really I'm afraid. The 180:1 and 90:1 are on the pan tilt head, which means they stall at different speeds and have different payload capacities. It would be much better if the two axis were the same. I could put both 180:1 drives on the pan tilt head but since the 180:1 are a little stronger they're supposed to be used for another purpose, plus I wanted the additional speed of the 90:1 for the pan tilt.

    I wish I could switch them around, would make things a lot easier.

  4. #4
    Quote Originally Posted by mbridge87 View Post
    Not really I'm afraid. The 180:1 and 90:1 are on the pan tilt head, which means they stall at different speeds and have different payload capacities. It would be much better if the two axis were the same. I could put both 180:1 drives on the pan tilt head but since the 180:1 are a little stronger they're supposed to be used for another purpose, plus I wanted the additional speed of the 90:1 for the pan tilt.

    I wish I could switch them around, would make things a lot easier.
    I am not understanding this. Are you saying that the motors stall ? So 180 turns of the motor should be 1 turn on the output.
    ..Clive
    The more you know, The better you know, How little you know

  5. #5
    I'm talking about the speed at which the motors stall. So, as you'd expect, the 180:1 is a lot slower than the 90:1 and hence cannot reach the same speed before stalling.

    I'd prefer that the faster motors be on the pan tilt head hence wanting the 90:1 versions there. Does that makes sense?

  6. #6
    Quote Originally Posted by mbridge87 View Post
    I'm talking about the speed at which the motors stall. So, as you'd expect, the 180:1 is a lot slower than the 90:1 and hence cannot reach the same speed before stalling.

    I'd prefer that the faster motors be on the pan tilt head hence wanting the 90:1 versions there. Does that makes sense?
    Yes of course I should have known better.

    I wasn't thinking about the motor speed 😡
    ..Clive
    The more you know, The better you know, How little you know

  7. #7
    m_c's Avatar
    Lives in East Lothian, United Kingdom. Last Activity: 3 Hours Ago Forum Superstar, has done so much to help others, they deserve a medal. Has been a member for 9-10 years. Has a total post count of 2,552. Received thanks 307 times, giving thanks to others 7 times.
    I'm possibly wrong due to lack of sleep, but shouldn't a 90:1 turn 4 degrees for every input revolution?
    Which would mean you've got one 180:1, and two 360:1 reducers.
    Avoiding the rubbish customer service from AluminiumWarehouse since July '13.

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  9. #8
    You're totally right. Someone else pointed this out to me elsewhere and I hadn't even thought about it. I was so focused on how the company wouldn't acknowledge this obvious difference.

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