The summary of my latest studies

[path_finder]

Willing definitely get a real answer about the raj 'double elbow' design, I decided to build a demonstrator.
The drawing below shows the final status of the device, with TWO speed doublers based on the tripod concept.
See the animation displayed in the raj's 'mayday' topic here: http://www.besslerwheel.com/forum/viewt ... 875#112884
The area A and B are reserved for the 'double elbow' motion.

But up to now, I went to test only a single mechanism, before to eventually proceed if the results are positive.
So far the shot below show the building of the half of the final device.
The tenser of the chain and the 2x speed bar (where the elbow axle will be linked) are not fixed yet.
Only a practical building can tell if the raj design is effective.

[raj]

Dear Path_Finder,

Thanks a lot for your continued effort with the design.

Absolutely Marvellous!!!

Best regards.

Raj

[path_finder]

An important part has been missed by me in the above drawings: we need an intermediate plane to support the two gears and the chain tenser. Explanation:
- The chain assembly must be able to swing counterwise and anticlockwise around the main axis
- The gear fixed to the tripod must be free to rotate with the same 2x rotation speed
- the gear centered on the main axis must be FREE (as a copy of the other one) and its shaft must be available outside of the main wheel cage for the control of the unbalance.
- the big problem is coming from the chain tenser wich must be linked to the swinging chain.

The only way to solve this constraint is to include a new plane, like shown in the pic/video below.

[path_finder]

Due to heavy heath cares I cannot now be so much productive like earlier.
Nevertheless I try to finalize my best promising building.
Absolutely confident in the 'Raj Balkee' reference design, I still continue to find an efficient and reliable solution for finding a speed doubler, one of the requested part for the implementation of this concept.

As previously published the first animation shows the speed doubler mechanism, based on two triskelions rotating counterclockwise when the main wheel rotates clockwise. The two centers of the triskelions support a set of three gears of equal size (see the second animation), where the center gear rotates clockwise and twice faster than the main wheel. This center gear is sticked to a disk (not represented) supporting the elbows of the 'Raj Balkee' design, shown in the third animation below (updated).

The building of the speed doubler has requested a specific tool. Instead to by an expansive professional tool, I decided to build mysef a slot drill consisting in a pair of rails and a rolling wagon supporting my hand drill.
The fourth shot shows this assembly.

[johannesbender]

nifty little router ;-)

[path_finder]

Just a simple shot of my latest building in progress, in accordance with the above shown concept (fork3x_040d.png).
I received my Christmas gift in advance (a PROXXON DS230/E see here: http://www.conrad.fr/medias/global/ce/8 ... PS_400.jpg, allowing me to cut my first wooden gear.

[wheelrite]

you have an eye for motion and the hands on practical skills to make superb and thought provoking physical test pieces, I really enjoy viewing them thanks.

[path_finder]

Many thanks to wheelrite for the encouragement.

At least, I have now a speed doubler compliant with my old criteria: simple, slim, efficient, reliable and easy to build.

Before to subcontract all the parts I went to verify the correct behavior of the parts.
On the shot below is the corresponding demonstrator I built for test.
A is a wooden support (not a part of the final wheel)
B is the main frame of the wheel (where the two long legs will be linked). The internal gear has 72 teeth.
C is the divider disk. The outer gear has 60 teeth assuming a speed ratio with B of 6/5. The inner gear has 30 teeth.
The disk C will be loaded with a population of weights and will act as a flywheel, the contact with B and D being obtained by the gravity.
D is the doubler. It has 18 teeth, assuming a speed ratio with C of 5/3, the overall speed ratio with B being 6/5 x 5/3 = 2.
Note the very important criteria now assumed, source of my difficulties: thanks the selected geometrical values this doubler is centered on the main wheel axis. There is no belt no crank, etc.
E is the tripod supporting the three rollers F. The purpose of this tripod is to keep the doubler at the center of the main wheel.
The size of the three F rollers is idle (they are here just for the centering).
The tripod is sticked to the doubler D and rotate at a speed twice the speed of the main frame B, and supports the two pins where the small legs will be linked.
Et voilà!
I will try to make an animation summarizing the motion of this sub-assembly (the second sub-assembly being the double elbow mechanism of Raj Balkee).

Like you can see there are some strange analogies with the details of the KKarlshafenkeystone.
http://www.besslerwheel.com/forum/viewt ... 7375#67375
Just an accident?
Also note the 4:1 ratio between B and D.

I wish to all members a good and productive year 2014.

[path_finder]

I return back to the way of centering the D doubler.
On my side I do prefer the design above using a trilob and three rollers.
But there is another solution using some springs and rods, shown in the drawing below.
The springs are in dark magenta, the rods are in dark grey-green.
The three E rollers are in contact only with the D doubler.
In the past I used this mechanism so many times: http://www.besslerwheel.com/forum/files/flowerbowl5.jpg
Can this explain the use of springs by Bessler?

[path_finder]

Another attempt this time with a wooden model.
The cutting being not perfect I have still some friction problems.
The first tests in the vertical position show an erratic therefore abnormal behavior of the divider C disk.
Not loaded yet, and perhaps with the weights attached it will be more conform.
If not, I think I have to find a way to force the divider in the keeling position.

[path_finder]

The required slim speed doubler consists in three parts:
1. The main frame
2. A doubler
3. A mechanism allowing the transfer of the motion from the doubler on the main frame center axis.

The doubler can be:
- either a roller (radius R) meshed to the inner rim of the main frame gear (radius 2R)
- either a tripode (radius R) sliding inside six grooves of the main frame (radius 2R) like above (image fork3x_step2).

In the second animation the blue tripode follows the grooves, the green tripode is linked but centered on the main axis, and will supprt the two pinions of the 'Raj Balkee' elbows.
In the first animation the blue gear (radius R) supports the three pinions.
As you want.

The two animations below show the skeleton of this mechanism.

The Schmidt coupling. See here:
http://www.youtube.com/watch?v=PKXc7EzgJh4
http://www.youtube.com/watch?v=ARs3y3i0enE


edited: 'first animation' replaced by 'second animation'

[path_finder]

Here below is an animation showing the primemover, second part of the final assembly, which will be attached to the centered tripode in the previous animation (slim2Xfork2 just above).
There are three parallel planes, each supporting two couples of rods (the elbows pinions being the ends of the tripode).
I hope to display soon a combination of the two parts/animations.
Being now located in Cameroon for my job, I will implement this concept when returned back home.
I think to be very close from the purpose of the flowerbowl (Prince of Sabu trilobed bowl in Cairo museum).

[rlortie]

Path,

Your raj3X.gif looks almost if not a duplicate of raj's initial concept!

I have been sitting here watching it turn and have a couple of "what if's" to run by you.

What if you were to shorten the rim hanging rod giving you more free fall time which also should increase leverage. Also possibly allowing for two weights to abruptly be in the free fall stage.

To compensate you make the inner levers longer, giving up a little leverage but increasing inertial velocity.

Although I have never attempted a build of raj's originally concept, I still find it intriguing. If I ever do get around to playing with it, I will stick to the jack-shaft with a 2:1 sprocket ratio concept.

Has anyone including raj ever built it in such manner?

Ralph

[raj]

Path_Finder!
I, sincerely, wish your efforts be fruitful.

Ralph!
No, I haven't tried it.

Maybe I should give it a good try now.

Thanks for your encouraging words about my gravity wheel concept.

Raj

[path_finder]

Dear Ralph,

Has anyone including raj ever built it in such manner?

On my side up today I just built a demonstrator in view to verify the geometrical behavior and confirm the relocation at the center.
So long I don't have any comfortable doubler I cannot test the full design.
Below an old video published here earlier.

Dear Scott,
Reviewing this thread I discovered that a lot of videos have been removed from the topics, although they are present in my User Attachment List.
Is the database corrupted?
Anyway many thanks for your efforts for the disposal of this forum and the subsequent servicing.