Can a 7.2 Volt Driver Rotate a 300 Pound Weight with Ease?

In summary: Can you provide more information on how the weight is divided into segments? What are the dwell times? Are they the same for all segments? Are they adjustable? What are the maximum dwell times? What are the maximum weights? What are the dimensions of the segments? Are they round or not? Is the weight on a shaft? The dimensions of the segments are not specified. The dwell times are unspecified. The maximum dwell times are unspecified. The maximum weights are unspecified. The segments are not specified to be round. The weight is not specified to be on a shaft.
  • #1
lefthook
6
0
I have a device that is able to rotate on a shaft a weight of 40 pounds with less effort than it does to rotate a weight of 10 pounds on the same shaft. The rotation of the 40 pounds can be done simply by rotating the shaft by hand using only a slip motion. This design can rotate weights over 300 pounds using same slip motion without gears, pullies or any other input.
A 7.2 volt driver rotates the 300 pound weight to around 45 rpm as well as the ability to do the rotation by hand. Disengaging the driver allows the device to slow down, however the intermittent use of the driver keeps the device rotating and back up to speed. An electronic
shaft encoder would deliver pulse to maintain a set desired rpm. Need assistance to take this technology further. Suggestions and advise please.
 
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  • #2
Welcome to PF! It isn't clear to me what assistance you are looking for. Can you ask a specific question please? Also, as worded your description of the device has a hint of the provocative, but really looks pretty simple and mundane; You're spinning a weight around a shaft. Not much weight and not very fast. That's pretty basic. Can you elaborate on why you think this is useful/interesting, what it is useful for and what you want to discuss about it?
 
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  • #3
You obviously do not understand what I am talking about. So you can spin by hand on a shaft a weight of 400 pounds? Just by rotating the shaft itself?
 
  • #4
lefthook said:
You obviously do not understand what I am talking about.
Evidently. Can you draw a diagram or provide more of a description of the setup and what it does? What you provided is pretty vague.
So you can spin by hand on a shaft a weight of 400 pounds? Just by rotating the shaft itself?
Certainly! With well lubricated bearings a person can easily spin something weighing thousands of pounds.

Note that constant speed motion does not require any input force and you did not specify that acceleration rate was important.
 
  • #5
Welcome to the PF. :smile:
lefthook said:
So you can spin by hand on a shaft a weight of 400 pounds?
As Russ says, you can spin thousands of pounds if the friction is low enough. This little girl can spin this very heavy sphere because it is riding on a low-friction water bearing (Kugel fountain)...

https://upload.wikimedia.org/wikipe...he_Stars.jpg/405px-Reaching_for_the_Stars.jpg
405px-Reaching_for_the_Stars.jpg
 

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  • #6
Google tells me a 10' playground merry go round weighs a thousand pounds (children not included).

bigstock_Merry_Go_Round_176951.jpg
 

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  • #7
lefthook said:
...
Do you have anything more you would like to say or should we just close the thread for having nothing to discuss? It's your thread: if you want it to continue, you need to give it a purpose and content that can support that purpose.
 
  • #8
Gentlemen, obviously more information is needed so here we go. 1 wheel weighing 10 pounds has a segment removed so the weight is now below the center line and requires a lot of effort to get it to rotate. However, this wheel cannot be rotated by simply rotating the shaft. The 40 pound weight is divided into a number of segments each with a dwell time motion. This, due to the dwell motion that connects all the other segments, can be simply rotated by hand just by rotating the shaft. Yet the single 10 pound weight cannot be rotated period.
 
  • #9
It would be greatly appreciated if an open mind attitude was displayed by the staff mentor.
 
  • #10
Our minds are definitely open, unless of course you start trying to discuss some over-unity mechanism...

Can you Upload a sketch? Use the Upload button in the lower right of the Edit window to upload a PDF or JPEG copy of your sketch. Thank you. :smile:
 
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  • #11
Over unity mechanism, no nothing as complex as that.
 
  • #12
lefthook said:
It would be greatly appreciated if an open mind attitude was displayed by the staff mentor.
It would be greatly appreciated if you could provide a diagram of the device and detailed descriptions. You will find lots of professional scientists and engineers here, but no mind readers.
lefthook said:
1 wheel
What are the dimensions of this wheel? Is it on a shaft? What's the diameter and length of the shaft? How is this all oriented?
weighing 10 pounds has a segment removed...
What is a "segment"? What shape is it? How much does it weigh? Where on the wheel is/was it? How is it removed?
so the weight is now below the center line and requires a lot of effort to get it to rotate. However, this wheel cannot be rotated by simply rotating the shaft.
Why not? A weight of something less than 10 lb and only slightly out of balance is not much. Exactly how much torque is required? Have you calculated it?
The 40 pound weight is divided into a number of segments each with a dwell time motion.
What is "dwell time motion"?
This, due to the dwell motion that connects all the other segments, can be simply rotated by hand just by rotating the shaft. Yet the single 10 pound weight cannot be rotated period.
So an object/device that we still haven't been shown the design or performance calculations of is easier to rotate than another lighter object/device that we also still haven't been shown the design or performance calculations of. You haven't demonstrated that what you are saying is true, but even setting that aside: so what? What does it do that is useful? You said you "need assistance taking this technology further", but what does that mean? Are you asking for names of a metal shop that can fabricate it for you? Are you asking us if it could do anything useful?
 
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  • #13
lefthook said:
Over unity mechanism, no nothing as complex as that.
Just an fyi, the reason for the question is the title of the thread implies energy production. So far, you haven't said anything obviously related to the title of the thread.
 
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  • #14
I think it pointless to continue this thread since you admit you have no idea what I am describing yet feel qualified to criticize to what you obviously view as a mechanical abstract. In case you are not still aware, the world is almost round.
Goodbye!
 
  • #15
lefthook said:
I think it pointless to continue this thread since you admit you have no idea what I am describing yet feel qualified to criticize to what you obviously view as a mechanical abstract.
I have not offered any positive or negative opinions on the device - I have only asked for more detailed descriptions so I can understand it before offering them. But either way, since you are unwilling to provide this, yes, it is best to close the thread. Good luck to you.
In case you are not still aware, the world is almost round.
Not sure what that has to do with anything, but yes, the world is almost round. It is also almost flat. :wink:
Goodbye!
Bye!
 
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