Instructables
Picture of K'nex Oblivion Ball Machine Instructions
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Someone challenged me in a comment on the previous ible that I should make bigger ball machines so here it is! The Oblivion ball machine has one unique element and that is the automatic drawbridge or path 1. The bridge starts when the ball hits a switch and starts to lower. Then, a second motor will kick in and pull the mother switch back up making the bridge raise and then the bridge will shut the main motor off. This element I think was on another ball machine but I reinvented it to suit the newer motors. The first video shows the drawbridge element by itself. Credit goes to Shadowman39's motor switch mechanism in video one.
 
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Step 1: Piece Count

RODS:

grey: 94
red: 196
yellow: 458
blue: 878
white: 401
Green: 778

CONNECTORS:

white: 97
blue 3d: 265
purple 3d: 603
yellow: 452
green: 24
red: 314
orange: 110
light-grey: 14
dark-grey: 209

SPECIAL:

orange track connector: 159
Black or tan rod: 3
Purple flexi-rod: 22
orange flexi-rod: 3
tan lock: 19
blue clip: 25
Y clip: 78
blue spacer: 113
silver spacer: 129
track clip: 6
medium tire no tread: 11
small tire: 4
red gear: 6
small blue gear: 1
yellow gear: 1
motors: 3
triangle panel with three holes: 1
chain link: 142
tubing
string

GRAND TOTAL: 5,621



Step 2: Base And Supports

Picture of Base And Supports
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Let's start building!

Step 3: Return Path

Picture of Return Path
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Step 5: Secondary Supports

Picture of Secondary Supports
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Step 6: Path Selecters

Picture of Path Selecters
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javive_78921 month ago

can you post more pictures from inside connection for the motor that is on the middle of the drawbridge step 7 its hard to see the inside parts, THANKS

knex akbar5 months ago

does this work with the newer knex balls aswell?

MisterBukweet11 months ago
I think I finally figured it out.... my version of Oblivion..
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MisterBukweet11 months ago
Great build... just got some adjustments to make on the bridge and I'm done... whoot
knexpert#10829476 (author)  MisterBukweet11 months ago
Great job! Can you post pictures of it on this ible?, I would really like to see it:D
Well here it is... just remember you asked for it.... It took me 3 days to get that bridge to work.... Here is a free tip for those who wish to build this machine or use the draw bridge element.... Don't use stretchy string...
Sure thing... After I find some non stretching string for the drawbridge..
I'm working on the machine and I'm in the drawbridge step right now. I can't get the bridge to start motor 2 all the time. Any suggestions?
For me it was just luck of it working. Is the string through the connector hole? It takes a lot and I mean a lot of tweaking for something like that so patience for something like that is needed. I'm really happy that you are building my machine!
hunter9991 year ago
Great job mate in such a short time frame, truly awesome!
How many knex balls do you recommend?
At least 3.
This is one epic big ball machine, challenge completed :D
I really like the drawbridge element, very cool invention.
BTW, is it named after the film?
My next build which is coming up shortly isn't as big but it is very mechanical,my style of ball machines.
Can't wait! You are very fast, sometimes there is only one week between 2 ball machines.
I didn't know there was a film called Oblivion:P
Shame on you ... ;D
Epic ball machine, great build! Keep up the good work!
collinjo121 year ago
Very cool! I see some inspiration i'm getting from you! I plan on using that double ball arm from ionization in my current ball machine. Maybe you could try making a knex ball machine elements guide to bring your elements you've made so far into one place, as well as redesigns of others you've made also (and have updates)!!
cal2871 year ago
That is cool! Nice build man.
For a ball machine with instructions, this thing is pretty big! Great job. The thing I like the most about your drawbridge is how smooth it is. But, it would be nice if I had credit in the Ible and videos since you used my motor switch mechanism.
knexpert#10829476 (author)  Shadowman391 year ago
Yes, it would be great, you deserve credit:).
Wait a minute...Sandroknexmaster and I only suggested you go bigger last week. You figured out the drawbridge mechanism and the whole caboodle in that time?! ;-D
Great job, this machine is really cool! I really like the drawbridge element; I have tried something like this before but never got it to work. Between you and Shadowman39 I'll have to learn the art of mechanical automation!
So keep it up with your machines and let us have some more innovations! Now you see why bigger is more fun? ;-)
JonnyBGood1 year ago
Nice!
alexf11 year ago
Very unique ball machine. I had to build a drawbridge like that for an engineering class out of knex.