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« Last post by webby2 on October 13, 2023, 05:37:29 am »
Getting frustrated with run-out and such.
I do not want to spend a lot of money buying sprockets and stuff so I have to come up with a way to print my parts and get them close.
My chain goes to tight in one section of motion and then too loose but when you are trying to keep things lined up that does not work very well.
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« Last post by webby2 on October 09, 2023, 05:26:52 am »
I opted for a chain and sprocket for part of this, I thought it would be the most economical way. Well when you make some silly mistakes it gets to be frustrating when what should be a nice smooth movement ends up being hard and messy.
When using a chain and sprocket it is important to chamfer the edges of the sprocket, not just make the sprocket 0.5mm thinner than the chain, then I was off by just a little bit on shaft spacing so I had to add a 1\2 link into the chain, and I am using plastic printed sprockets on printed shafts going through metal bearings and using a metal chain,, guess what bends a little bit,, guess what has a little run-out,, silly mistakes.
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« Last post by webby2 on September 27, 2023, 02:55:05 am »
I do not like using a velocity related force as a drive force, that is I do not want to use CP as the output force source because that means the faster I spin the system the more force the system puts out. I would rather have the output of the system dependent on the amount of force I put in so that it all can be controlled for the application that it is designed for independent of rate of rotation.
I have built test-beds in the past that I could use to replace Mr. Hand with the current test-part and test-bed, the basic need I understand. While I was going over design ideas and I was going back to an old test-bed I built, I realized that the issue I ran into with that test-bed is exactly what is happening within this current setup.
It all has to do with the difference between torque and leverage and the work transfer function that each uses.
A simple solution I came up with for that old test-bed, I used, but I did not like so much because it limited my access to some of the interactions I wanted to play with. Looking at the setup on my screen I see that there are other solutions, one of which I used but for a completely different thing, and one that is almost easier than the one I used.
I made this other test-bed that allowed me to take a non-circular motion and convert it into a circular motion, just not the way it is usually done.
I am going to combine these things from the past into a single device for the input section of my current test-bed and hopefully I will be able to control the input force independent of rotational velocity, but at the least it will allow for a synchronized input to output timing without interfering.
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« Last post by webby2 on September 23, 2023, 06:33:31 am »
I think I understand what Mr. Hand is doing.
Initially Mr. Hand is spinning up the weight, then CP is building and creating its own input force, this new force quickly outperforms the weight. After this point Mr. Hand is no longer primarily supplying a force of acceleration to the weight but rather keeping the CP and the system in sync.
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« Last post by webby2 on September 22, 2023, 06:14:41 am »
My input is via a long "T" handle Allen wrench. When I start spinning the system I am putting in a lot of work and using one motion or path of input. When the system is spinning up at some point I shift from making a circular motion with my hand at an almost perpendicular relationship to the test part to a centered but angled motion.
The Allen wrench is not fixed to the test part but is pushing against one surface of the test-part so as to cause a rotation of that test part, which it is free to rotate on the shaft it is on.
When I have it spinning up at some value and the test-part starts to lift up the shaft and I am using the angled motion my input feels like it drops way off and as I try to spin faster I need to add a larger resistance to the output shaft to stop it from spinning faster which would lift the test-part up and off of the shaft. Done that a few times now.
The whole test-bed and mount table shake a lot since it is out of balance due to the weight on the test-part.
Since all this is being done with Mr. Hand It does not mean much of anything, but it is only an interesting observation.
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« Last post by webby2 on September 22, 2023, 04:57:00 am »
That design worked for what I thought I needed but it turns out that was not what I really wanted to do, so it did not work for a gain.
I have noticed a few odd things however, one is that when I assemble it with one part or not that the system behaves in a similar manner but not exactly the same. I am meaning that I "can" get the same throughput either way, but in slightly different paths.
I made another part to test some force interactions and that part does something interesting as well when I use the part or not, again similar but not the same and if I use that test part with the other part and spin it up too fast the test part lifts up and off of the shaft, the faster I spin the test part the more resistance I need to add to the output shaft. I have a weight sitting on the edge of the test part and my input rotation is 1:1 with the output rotation.
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« Last post by webby2 on September 17, 2023, 03:12:28 am »
Just putting this out there.
I have held a view for a long time now, after running many tests off and on over several decades, that the permanent magnet is no more a source for the magnetic field than a magnifying glass is a source for light.
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« Last post by webby2 on September 14, 2023, 07:22:17 am »
I have been working on a re-design of my force input section. I wanted to reduce the parts count and keep things as simple and uncomplicated as possible.
I had to give up on some of the possible force amplification to go this way but that should be no big deal.
With the newer force section design I should be able to incorporate my input force and my input motion into one input, one aspect making force and the other making rotation.
I have built 1\2 of the force section and tested it in a static kind of condition, that is, I raise the force potential within the system and after that is done there is no rotational force from that while holding the force potential. This might work fine with only 1\2 the force section but then I would need to provide 2 input sources instead of one.
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« Last post by webby2 on September 13, 2023, 02:13:36 am »
Sometimes trying to follow all the twisted paths gets a little much, but the more I look at them this way the easier they get to follow.
One thing I have not figured out, and most likely I never will, is how I can push against a wall directly and have that push move me closer to the wall or ,conversely, pull on a rope attached to the wall and have that pull move me further away.
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« Last post by webby2 on September 03, 2023, 05:11:27 am »
Still making parts,,, but with what I have I tried to see if I can even find a positional relationship where an input force only transfers as a force with no motivational component other than to move a "lever".
Well It may not be ideally what I am looking for but I can pass a leverage into the system against a force of opposition, keeping the lever balanced by using my system to supply the other half of what the oppositional force needs. I then move that "system" in a rotation fashion and the output is what I think I am looking for,, the not so good part is that it is a fine balance point that can be upset and I am looking for a stable condition that is not easily upset.
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