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  #31   Spotlight this post!  
Unread 06-02-2017, 09:54
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Re: 2.5" CIM Motor stops when climbing

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Originally Posted by serdaruluer View Post
If we can find a gearbox, which model do we need for CIM motor? 15:1 Ratio

Thank you.
For a direct 15:1 ratio you could get a VexPro VersaPlanetary with a 3:1 and a 5:1 reduction (which combine to create a 15:1), you would also need a CIM Adapter and 2 ring gears.

Alternatively you could buy this 16:1 BaneBots Gearbox from AndyMark that comes with all the parts you need (though costs more).

You could also use a ToughBox Micro with a 12.75:1 ratio and add a sprocket reduction using a 12 tooth and a 15 tooth sprocket.


I believe both Vex and AndyMark ship internationally.
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Last edited by cbale2000 : 06-02-2017 at 09:58.
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  #32   Spotlight this post!  
Unread 08-02-2017, 05:31
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Re: 2.5" CIM Motor stops when climbing

Can we use
http://www.andymark.com/PG71-Gearmot...-p/am-2971.htm
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  #33   Spotlight this post!  
Unread 08-02-2017, 05:44
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Re: 2.5" CIM Motor stops when climbing

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Originally Posted by serdaruluer View Post
Not without a sprocket reduction between the output shaft and the shaft of your climber, even then chances are it won't be able to lift your robot all the way up the rope within the 30 second end game period. It has 1/10th the power of the CIM, so it will be much slower compared with a properly geared CIM.

If you want to continue to use your current setup, it shouldn't be too difficult to integrate a Versa Planetary into it as it has the same mounting holes as the CIM ( you'd would probably need to use a different sprocket).

You might not have enough time to get it done before Bag day, but I'm sure there would be plenty of teams who would be happy to help you get it working at the NYC regional.
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Unread 08-02-2017, 07:26
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Re: 2.5" CIM Motor stops when climbing

Just realized you guys will be at the nyc regional. I'll be there all 3 days without too much to do so if you need me to I an bring some versaplanetary parts and I can help you guys get running.
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Unread 08-02-2017, 10:53
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Re: 2.5" CIM Motor stops when climbing

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Originally Posted by serdaruluer View Post
In theory, any motor can lift anything, if geared properly. But the power of the motor will determine how fast it can (theoretically do so).

Do you have someone local (a physics teacher, perhaps) who can help you with the math?
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  #36   Spotlight this post!  
Unread 08-02-2017, 11:22
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Re: 2.5" CIM Motor stops when climbing

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Originally Posted by Ether View Post
FTFY. The power out of a gearbox is the same as the power into the gearbox, minus any inefficiency in the gearbox. The power is neither geared up nor geared down.



I was responding to someone from Turkey who appeared to have neither an engineering background nor English as a first language. Assuming that, I tried to frame my response in simple terms.

"Gearing up" is a phrase that typically refers to changing to a higher gear, either in a car or a bicycle, resulting in more speed and less hill-climbing ability. And, vice-versa. I did not think that a treatise on work per unit of time, torque or RPM was necessary - or helpful - in this instance.

Similarly, given that the team is in Turkey, it might not be helpful for any of us to advise ordering this or that gearbox from AndyMark. (he asked, "Can we find another solution but using gearbox? On the motor side small gear, on the shaft side big gear possible?") Just sayin'.
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Last edited by chapman1 : 08-02-2017 at 11:47.
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  #37   Spotlight this post!  
Unread 08-02-2017, 13:09
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Re: 2.5" CIM Motor stops when climbing

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Originally Posted by chapman1 View Post
I tried to frame my response in simple terms.
I understand you were trying to help, and I applaud that.

But I guess we'll just have to agree to disagree whether it is clearer or more confusing... especially for other students reading this thread who are just beginning to understand the concepts of torque and power and gearing.

No treatise is necessary. Maybe just a footnote.


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