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1
General stuff / Re: Picking things back up
« Last post by webby2 on Today at 07:53:38 am »
While I am contemplating the next step and changes to twofer I am working on 2 other test-beds that I am using to try and look closer at some of the relationships I am using in twofer.

I am planning on changing the drive system for twofer, I am going to move it external of the system to make it easier.
I also need to balance the system, this seems to have a very large impact on the draw of the input motor.

I am NOT planning on actually pulling twofer completely apart, but instead will try and use add-on parts only,, keeping the first test-bed intact could be a good thing.
2
General stuff / Re: twofer
« Last post by webby2 on July 06, 2020, 02:20:40 pm »
Another stupid thing,,

I do not have the system balanced, at all.
I spun up another test-bed that is about the same mass and stuff as unbalanced as twofer was and had about the same draw readings, well, then I balanced that frame and the draw numbers came down to between 0.16A and 0.24A,, and that was not "perfect".
3
General stuff / Re: twofer
« Last post by webby2 on June 29, 2020, 02:32:38 pm »
Thought of something stupid.

How much does it cost me to run the system without the twofer gear engaged?
at 6V it costs between 0.31A to 0.34A . 
That is a lot of the increase in draw,, so maybe I need to start with better motors and generators.
4
General stuff / Re: twofer
« Last post by webby2 on June 29, 2020, 06:38:32 am »
My system is a geared transmission that is a 1:2 step up ratio, for every 1 RPM in on the input  the output has 2 RPM.  This is a constant ratio.

It uses the twofer gear to communicate the input work through the system and to the output.

I am encouraged by the test results and am now planning on building a better version using more efficient motors and generators to hopefully loop the system.
5
General stuff / Re: twofer
« Last post by webby2 on June 29, 2020, 06:32:06 am »
due to extra frictional losses with my system I had to increase the voltage to 6V

Here then are those numbers with a 6V input.

They are
no second motor
second motor
second motor with 17.2 ohm resistor across the terminals

benchmark 1:1
0.12 to 0.14
0.24 to 0.26
0.49 to 0.52 v out 1.96 to 1.97

benchmark 1:2
0.15 to 0.18
0.42 to 0.47
0.74 to 0.76 v out 1.48 to 1.52

system
0.37 to 0.41
0.53 to 0.56
0.68 to 0.72

Observation: with the 2:1 benchmark the load on the motor caused it to heat up and slow down, so I cooled it off several times and ran a short loaded test, the 1:1 benchmark did not appear to exhibit this to the extent of the 2:1 and the system did not appear to exhibit this problem to that extent either.
6
General stuff / twofer
« Last post by webby2 on June 26, 2020, 02:18:58 pm »
I am going to place the test stuff here.

Right now I have only tested the benchmark setup, I am still making a few more parts for the test-bed itself.

The motor will be run at 3V for all tests.
I am using the same loaded motor with the same 17.2 ohm resistor across its terminals for all of those tests.

The motor with nothing else
0.03A to 0.08A

The motor in the housing
0.05A to 0.08A

The motor in the housing with a second housing output shaft connected directly to the first housing output shaft
0.08A to 0.09A

The motor in the housing with a second housing output shaft connected directly to the first housing output shaft with a motor in the second housing
0.19A to 0.21A

The motor in the housing with a second housing output shaft connected directly to the first housing output shaft with a motor in the second housing and a 17.2 ohm resistor across the second motor terminals
0.29A to 0.31A
Voltage across the resistor
0.855V

The motor in the housing with a 65T gear attached to the output shaft and the second housing with a 33T gear attached and no second motor
0.9A to 0.11A

The motor in the housing with a 65T gear attached to the output shaft and the second housing with a 33T gear attached WITH motor
0.32A to 0.38A

The motor in the housing with a 65T gear attached to the output shaft and the second housing with a 33T gear attached with motor and a 17.2 ohm resistor across the second motor terminals
0.43A to 0.47A
Voltage across the resistor
0.534V
7
General stuff / Re: Picking things back up
« Last post by webby2 on June 25, 2020, 06:59:01 am »
I am using motors like these, as an fyi,,

https://www.amazon.com/Cylewet-Motor-Shaft-Arduino-CYT1037/dp/B01N9MS3UZ

They suck as far as efficiency goes :)  They do work great for building motorized toys,, a few cars and tanks and well I had them lying around so I used them.
8
General stuff / Re: Picking things back up
« Last post by webby2 on June 25, 2020, 06:51:56 am »
my modular build is not as modular as I would like,, normal stuff there,, but while I was working out some other parts I would like I think I ran across an interesting situation.

I think I have a twofer,, for those that do not understand that word it is short for " two for one".

It is elctro-mechanical in design and I made a few parts to put a quick test-bed together to see if what I thought could be there is there, in some form or another.  That crude play time seemed to support what I think I can do so I am now making and designing some parts to do a comparison test since the electrical stuff I am using is not very efficient I can only compare these significantly less than 50% efficient devices input costs against the same load without my system and going through my system.

I am doomed to fail of-course,, but it is fun and exciting anyway.
9
General stuff / FreeCad
« Last post by webby2 on June 20, 2020, 05:53:04 am »
Found something nice in FreeCad 17.

I have been printing out a bunch of gears and have had issues with the accuracy of my placement of those gears so that I have enough slop to not bind but keeping them close enough to do there job,, well in FreeCad Involute Gears there is an option for "shift" which changes the ratio between the heel and toe of the gear, or is that peak and valley,,, and there is "clearance" that sets the depth of clearance for the valley.

I have been re-printing some gears with these options tweaked and it works so much nicer,, just print, clean up and place them right where they are supposed to be and PRESTO! they work smoothly.

I have been using FreeCad for all my design work and part creation,, it can do way more than I need and I am only using the basic functions but it is nice and easy to use.
10
General stuff / Re: Picking things back up
« Last post by webby2 on June 14, 2020, 07:50:45 am »
Interesting but most likely not useful,,

My other build is very modular, meaning that I can easily take it apart and then re-assemble with the parts in a different configuration so that I can change the path all the forces take to get to the same end point.

I have it together in one orientation and did not have any external mechanical connections made and was checking on the internal added force stuff,, well I fired up the internal added force and the system started to do its thing and then I noticed that being free to spin about its axle the whole system started to rotate and the mass of the system was also rotating and it was rotating in the direction of rotation of the whole system.  The rotation of the whole system seems to settled down at the same rate of the internal rotation.

I reversed the polarity of the internal source and the rotation also reversed.  It takes a little bit of time for the whole thing to stabilize but once it gets itself organized it settles down quickly to the stable RPM.

I think it is interesting reaction.
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