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ideas on 3 axle functions going though turntable?


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#51 rgbrown

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Posted 06 February 2011 - 09:41 PM

View PostZblj, on 06 February 2011 - 07:38 PM, said:

Technically the rope is a third function  :tongue: Should be good for cranes. The 3,2 mm tube can carry some torque, it depends on the gears used.
Yes, as I said earlier Posted Image. Except I had a rotating flex cable up the middle, instead of a rope. Not my idea though, I've seen clocks built this way.

#52 Oerieth

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Posted 07 February 2011 - 08:17 AM

View PostblueShinyApple, on 05 February 2011 - 08:48 PM, said:

yeah kinda'

Here's how to do it:

get as many freely spinning axles through the turntable, then one ofter another get into the centre then lead them away to their functions:

Attachment 3axlesthruturntable.jpg



hope you understand  :classic:

Very genius sollution. I'm just wondering if the "get into the centre and lead them away" is required on both sides. I think it would be sufficient and probably more efficient to do it only on one side.
Correct me if I'm wrong.

Edited by Oerieth, 07 February 2011 - 08:18 AM.


#53 blueShinyApple

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Posted 07 February 2011 - 04:59 PM

View PostOerieth, on 07 February 2011 - 08:17 AM, said:

Very genius sollution. I'm just wondering if the "get into the centre and lead them away" is required on both sides. I think it would be sufficient and probably more efficient to do it only on one side.
Correct me if I'm wrong.

No, it's not needed, but it would take just as lot of space as it takes now; only difference is that everything would be on one side of the turntable, instead of 50/50 as it is now.
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#54 CP5670

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Posted 09 February 2011 - 05:09 AM

Doing it on both sides actually provides an advantage here since it allows the blue geartrain (36t gears) to move independently of the other two geartrains. The gears inside the gray liftarms would behave like planetary gears. That's what I especially like about his idea. The other solutions I've seen for doing this involve quite a bit of dependency and backlash between the different geartrains, which make them useless in practice.

All the geartrains will still be affected by the movements of the main turntable, but that seems to be harder to avoid and happens in the usual method for two geartrains too (8258/8043).

#55 fmmjqtft

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Posted 16 February 2011 - 05:21 PM

Here is the animation. I finished it a week ago but only uploaded it today.



I saved the frames to separate .pngs and then converted them to a video using gimp. For some reason this messed up the colors and the first upload had a 'black crush' (although this didn't happen when I opened it in VLC  :sceptic: ). I fixed this by reducing the contrast on each image using imagemagick but now lbg and dbg look too similar.

#56 blueShinyApple

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Posted 17 February 2011 - 05:23 PM

View Postfmmjqtft, on 16 February 2011 - 05:21 PM, said:

I saved the frames to separate .pngs and then converted them to a video using gimp. For some reason this messed up the colors and the first upload had a 'black crush' (although this didn't happen when I opened it in VLC  :sceptic: ). I fixed this by reducing the contrast on each image using imagemagick but now lbg and dbg look too similar.

huh?

Awesome anyways! :sweet:
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#57 fmmjqtft

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Posted 17 February 2011 - 06:15 PM

View PostblueShinyApple, on 17 February 2011 - 05:23 PM, said:

huh?

Basically the colors in this video are slightly distorted.

#58 blueShinyApple

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Posted 17 February 2011 - 08:38 PM

View Postfmmjqtft, on 17 February 2011 - 06:15 PM, said:

Basically the colors in this video are slightly distorted.
OK.. didn't notice
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#59 Bricktrain

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Posted 17 February 2011 - 10:35 PM

View PostblueShinyApple, on 06 February 2011 - 05:44 PM, said:

hmm, I was rather thinking to make a GIGANTIC 8270(mini terrain crane), like 5 times as big! that would just be mighty! :sweet:

edit: I really dont think it would fit in the 8053, but it's absolutely worth a try :classic:


I tried with 8421 and ended up with this http://www.brickshel...y.cgi?i=3909612

#60 blueShinyApple

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Posted 29 November 2011 - 06:10 PM

Yay, I'm on technicBRICKs!! *huh* :grin:
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#61 Alasdair Ryan

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Posted 29 November 2011 - 06:27 PM

View PostblueShinyApple, on 29 November 2011 - 06:10 PM, said:

Yay, I'm on technicBRICKs!! *huh* :grin:

I have not seen you on here for a long time.:sweet:

Edited by Alasdair Ryan, 29 November 2011 - 06:37 PM.

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Updated 02/08/12
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#62 blueShinyApple

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Posted 29 November 2011 - 08:31 PM

View PostAlasdair Ryan, on 29 November 2011 - 06:27 PM, said:

I have not seen you on here for a long time.:sweet:

Yeah, i know.. I'm in the 9th grade (=11th US grade, i think), so i have quite a bit of homework to do, tests to practice for, and papers to write :/

have anything special happened/been built?
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#63 Alasdair Ryan

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Posted 29 November 2011 - 08:45 PM

Well apart from the loader i finished today i am working on a harvester and my big skip truck.

Edited by Alasdair Ryan, 29 November 2011 - 08:45 PM.

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Updated 02/08/12
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#64 timslegos

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Posted 29 November 2011 - 10:07 PM

And i making some pretty awesome machines to  :wink: .  Anyway, i have just read the whole thread and i am amazed!  i never thought that 3 functions through a turntable would be possible.  Is there any way that it can be built smaller?

tim

#65 blueShinyApple

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Posted 29 November 2011 - 10:18 PM

View Posttimr, on 29 November 2011 - 10:07 PM, said:

And i'm making some pretty awesome machines to  :wink: .  Anyway, i have just read the whole thread and i am amazed!  i never thought that 3 functions through a turntable would be possible.  Is there any way that it can be built smaller?

tim

I don't think so, but perhaps the new small turntable could be used somehow. Do you know when the 1h2012 sets will come?
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#66 timslegos

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Posted 29 November 2011 - 10:36 PM

View PostblueShinyApple, on 29 November 2011 - 10:18 PM, said:

I don't think so, but perhaps the new small turntable could be used somehow. Do you know when the 1h2012 sets will come?
I dont know when they come out, i cant wait until they do.

tim

#67 le60head

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Posted 30 November 2011 - 12:50 AM

I just read trough this topic and i'm seriously amazed!

blueShinyApples, your solutions is incredible. i couldnt't understand how it worked until i saw the video.

Congratulations on your idea :)

#68 SNIPE

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Posted 01 December 2011 - 11:23 AM

I would imagine since the 8 tooth gears mesh with the inner gear of the geat ring it would be hard to fix the axles of the 8 tooth gears because they are offset.

Note that a 24 tooth concrate/crown gear can fit inside of the inner gear and if im not mistaken I think a LEGO 24 tooth clutch gear should be able tp aswell which allows for bi rotational movement but only slips when used on one direction, the other one meshes

Since the outer gear of the gear 'ring' is bi rirectional you can have 4 'speeds' with one gear ring so one can be for one function of the midel ,and the other one can be for 'such and such'

Just have two gear rings beside each other but on counter rotating axles that are still put 'end to end' in this configurationand that is 8 functions.

You can put two 8L axles with stops back to back (yes the stops are back to back) and then lock something over the stops so that it is harder to pulll them apart but still allows for counter-rotation which means having the hole for the axle a 'pin' hole not an axle hole.

Edited by SNIPE, 01 December 2011 - 11:35 AM.


#69 Alasdair Ryan

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Posted 07 December 2012 - 10:26 PM

I counted three functions plus rotation,but feel free to count them your self. :sweet:
Hopefully you can see the video alright....



The design above will not work,to make it work it requires one height retractable drive shaft to power the turntables.

Edited by Alasdair Ryan, 08 December 2012 - 12:59 AM.

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Updated 02/08/12
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#70 Alasdair Ryan

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Posted 26 May 2013 - 11:31 PM

I just came up with a very easy solution to a well known problem,it's not perfect but it will allow more functions though a turntable. :classic:

Posted Image

The pink drive shaft is connected to a cam which in turn lifts the whole middle axle,this then powers the third function.
Both blue and yellow gears are for your main functions which are still powered independently of one another.
The red gear is for the extra function.

Edited by Alasdair Ryan, 26 May 2013 - 11:43 PM.

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Updated 02/08/12
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