Part Three is the Charm

[Tarsier79]

. in making this thread the most popular ever on BW and expanding my fanbase exponentially!....

I hope this was sarcasm.

IMO Views are irrelevant. Content matters.

[Fletcher]

I don't know why but i can't share images anymore, only Youtube links.

I was thinking exactly the same linkage you have already, between one weight and one radial bar (the two folding arms).

Replicate this linkage between each weight and its neighbours.

If you can't get what i mean, no problems, i'll have a go with Algodoo, but i think we all know that Algodoo is WM2D for little children.

Take no offense RH, its not personal .. I ask people who suggest ideas to sketch and post them for me to follow because it cuts down the number of potential redo's I might have to do to get something right .. in the dim past some have got upset with me that I can't seem to follow their clearly written advice .. the process of drawing it up it forces the author of the idea to think it thru as it goes to paper, and this saves me time and effort ..

Right now I'm reading your description above - the sim consists of an able to fall past vertical lever-weight (lw - rod with yellow weight) - to it is connected massless rods in a V shape hinged (with mass) at the center junction - the lw is contained to movement within its sector i.e. it collides with the sector walls/spokes, and by the geometry of the V rods it interacts with .. if I understand you correctly you would like a second V shaped attachment with hinge (with mass) attached between a yellow weight and the next one in sequence - what is not clear is how far out the V should be able to move i.e. shallow V etc and are there any pulleys and ropes connecting them in any way ? Can you elaborate further ?

..........

Posting images as attachments to a post - fwiw picture files can be attached to a post - however there is a file size limit - to get inside the allowable limit either use an online resizer program to bring the pixels down etc - or do as I do - take a photo and load it into, or draw something up, in MSPaint etc - then save it as a .gif extension file (not jpeg etc) - gifs have much less detail and memory taken and will automatically be within file limits - but the drawing etc is still easy to see .. I actually use "Irfanview" (free download) a lot which has a gif default for saving pictures etc ..

Yes, Algodoo seems to be inferior to WM .. but it is as good as anything else as just a planning tool .. just build up what you are imagining and don't run it as a sim, or even save it - take a screen grab and put/dump it into MSPaint or Irfanview as I do .. then save as a gif and load to a post as an attachment ..

Happy Days !

[Fletcher]

A very good example to use and perplex those who do not understand that unbalance or overbalance or rather torque because some things are a little more distant here than there , does not a runner make , all non runners alike has/have/had a need for a total amount of energy that is/were/are not available .

https://m.youtube.com/watch?v=5WYCcSMLoVE

There is no better example imo of what you speak of jb (the ultimate ideological OOB wheel) .. maybe a Ramelli Wheel would be a close second ..

fwiw .. I seriously became interested in this subject more than 20 years ago now (my interest was peaked again after I read an article in Nexus magazine on John Collins and B's. wheels 1997) - but it wasn't until about 2003 that I decided to start building some of my previous doodlings to test out in real-world (the days before I had a sim to help with the planning and logistics of a build) ..

One of the very first builds was very similar to vprojects YT video (i.e. obvious geographical displacement OOB - what could possibly go wrong) - I mounted 2 bicycle rims on a stand, cranked at a shallow angle like the vid - and attached pivoting aluminum rods/bars in an articulated V shape (not the full scissor/SB as not necessary) - at the articulation joint of the V I added stacked washers (carefully weighed) when I was ready to test it - before that I carefully balanced each wheel and oiled the bearings etc - good to go, attach the washers .. lo and behold the thing would bind up with lots of frictions and twisting at the axles, from memory .. so I decided I needed a more robust and reliable way to synchronize the 2 wheels motion - I tried out a hollow rubber tube connection between the 2 independent axles - it was better but still had too much flex .. so I made a universal joint which worked much better greatly reducing the binding and twisting problem .. along with evenly spaced rim located rubber bands between wheels for stability ..

And, dang, even tho the washers etc were clearly further from the axle on one side and closer on the other, there was no surplus torque, not even close (turned well by Mr Hand tho) .. between that build, and the later Ramelli's, and Robervals etc, it was self evident that to get continuous self-moving rotation took something else besides geographical imbalance (had that in plenty) .. in the cases of the Ramelli's and RB's it was easy to work out that regardless of the obvious distance from axle differences if one of two identical opposing weights could not lose more PE than the other gained then no turny spinny ..

Side Note .. I would love to build the vproject vid in WM - but as you know it is a 2D program that can act like 3D in most instances by selecting whether parts collide or move thru each other etc ..

*** If you or anyone can think how to build it in 2D then sing out and I'll have a go .. coz I still want to sim it .. ***

[Tarsier79]

Back when I was doing more Sims, I found 3d was like it was a perspective drawing.... difficult to explain it better...

Anyway, The V wheels can be simmed by using two different radius wheel with different axle points. The second axle only works in my design if it is separate arms.

Green slots in main wheel to keep SB's alligned. Hopefully you can decifer my poor drawing...

[Robinhood46]

No offence taken Fletcher, i know exactly where you are coming from. The illusion that what is clear to us, is just as clear to someone else without a simulation, is a common mistake. Sketches can point someone in the right direction, but words alone can rarely get the message across.
My problem with posting images isn't that i don't know how to do it, or at least i don't think it is, i was happy posting images and i even got the hang of checking them and pivoting them when i messed up. My problem is that for reasons unknown to me they don't wanna anymore. Ever since that problem with the forum a good while back if i recall correctly. Maybe i need to give it another try since i have a different pc since then?
I think you have understood the basic principal of the addition i suggested.
"the process of drawing it up it forces the author of the idea to think it thru as it goes to paper, and this saves me time and effort .."
You are absolutely right there. I didn't really give it a great deal of thought, because i don't think it will make a great deal of difference. Best case scenario would be it will fail miserably, but maybe a little bit less miserably.
These two sims are somewhat similar, in the sense that the weighted arms are only interacting with the wheel, there are no interactions between the weights (one set and another set) only within each set, if there is a weight at the junction of the V and no interaction between weights if there isn't.
https://www.youtube.com/watch?v=L1hvuAokFHo
https://www.youtube.com/watch?v=BAMtQOWHkro&t=1s
You can also see the pain in the butt Algodoo is when it's not in a good mood.
I'll give some more thought and try to make a sim .

[johannesbender]

I don't know why but i can't share images anymore, only Youtube links.

I was thinking exactly the same linkage you have already, between one weight and one radial bar (the two folding arms).
Replicate this linkage between each weight and its neighbours.
If you can't get what i mean, no problems, i'll have a go with Algodoo, but i think we all know that Algodoo is WM2D for little children.

I think perhaps there is a limit to how much in total space a user can use by uploading attachments to the forum , i don't know for sure .
But if you click your name on the top right , then click user control panel , then click manage attachments in the left list , you will be shown a list of every attachment you uploaded to the forum.

You have the option to delete them , by selecting which ones you want to delete ,and using the buttons on the bottom right of the list, but this will remove the images from the posts you attached them too !

I suggest if you don't want to delete them , then use something like https://postimages.org/

[Robinhood46]

I had a look and i only have 122 attachments. It is more than your 40 odd, but i would have thought other members have far more.
maybe they do delete them every once in a while.

[daxwc]

JB: I think perhaps there is a limit to how much in total space a user can use by uploading attachments to the forum , i don't know for sure .

I don’t think so I have 22 pages of images. The only restriction I know of is byte size per image. Maybe he means he can’t share Algodoo files?

[Tarsier79]

I have had a problem in the past when I had a few larger files. I had to delete them, then haven't had a problem since.

[daxwc]

Heh Robinhood46 I see you posted just before me. If it is paint image have you tried changing the format? Just as you save the picture and name it underneath it has file type try changing that to JPEG.

[Robinhood46]

I do exactly the same as i did in the past, they just will not work, i haven't got a clue why.
I get annoyed with the bloody thing and give up pretty fast because i hate my computer with a passion.

[johannesbender]

https://www.phpbb.com/support/docs/en/3 ... _settings/

Here is an example of phpbb 3.0 board settings for attacments.
I would not know the settings of the board , just saying i think there was a quota on the earlier version too for attachments.

[johannesbender]

@Fletcher , I can relate ,i have been someone that read tons of books since my early days before i had access to internet , and it is in books where i have learned about this silly pursuit , i started developing ideas at a young age , i cant remember my first idea , but i remember coding up my very first sim in c++ back then , it was a circular newton cradle with hammers shaped and sized arranged around an axle ,a particular amount of them such that the top one at 12's handle was very close to being vertical and would tip over by its own overbalance and strike the next up hammer in the circular newton cradle.

Of course it worked fine on my program , because back then i did not know to code up energy losses and such :/ , luckily i have learned enough to know how silly the idea was back then.

edit: removed wrong quote..

[agor95]

I do exactly the same as i did in the past, they just will not work, i haven't got a clue why.
I get annoyed with the bloody thing and give up pretty fast because i hate my computer with a passion.

Can you check two methods 1. drag the file onto the text box were you enter the post details 2. try another browser.

Both these can help inform us of possible causes.

Regards

[Robinhood46]

Please don't misinterpret this, i really don't care about not being able to post an image. I only explained my problem so Fletcher knew why i couldn't post a sketch. Thanks for trying to help but i have no intention of trying yet again loads of different methods to get to the bottom of a problem that i can live with just fine.
Fingers crossed i can keep posting links, or i will have to do something about it.