Introduction: K'nex Balance Scale

Here is a knex balance scale I made a few weeks ago. It's uses a simple pivot point and two arms. It has a pointer at the top along with a dial to tell you how far from balanced it is. It doesn't use many pieces so most people can build it. This is the first one I know of on the site so far. It uses two large baskets to hold the items being balanced. This can also be used for counting items of the same mass. Needless to say this has many uses.
Please tell me what you think.
Killer~SafeCracker

Step 1: Part Count

This doesn't use many pieces, but it's always good to have a part count.

Connectors: #
White 17
Yellow 3
Purple 24
Green 36
Red 2
Light gray 2
Orange 2
Gray clip 4
Tan clip 3
Blue clip 2

Rods:
Red 6
Yellow 2
Blue 2
White 85
Green 58

Odds and ends:
Y connectors 4
Track splice 1

Step 2: The Baskets

In this step you will build the baskets. First off build this circular plate.Picture 1.
Next build these four things.Picture 2They are the same so it should be easy enough.
Now build this ring of yellow flexi rods and green connectors.Picture 3

Okay, Now add the four things to the main plate.Picture 4
Last but not least add the ring made in picture 3.Picture 5

Great, you have built one basket. Now repeat this step so you have two baskets.

Step 3: The Pivot Point

In this step you are going to make the pivot point of the scale. Here are two pictures of the same thing.

Step 4: The Arms.

In this step you will build the arms of the scale. First build this.Picture 1 Now build the hinge on which the baskets will hang.Picture 2 Then connect the arm with the hinge.Picture 3

Good job. Now repeat this step so you will have two arms and hinges.

Step 5: Hook the Arms to the Pivot Point.

In this step we are going to hook the arms to the pivot point. Just connect the three green/red rods to the half circle connectors.Picture 1 Do the same with the other armPicture 2 and there you go.

Step 6: Build the Body.

In this step we will build the main body of the scale. First build these two sides.Picture 1 Then add green rods to one of the sides.Picture 2 And connect the two sides together Picture 3

Step 7: Build the Dial

You need to build these two things. Pictures 1-2You'll need them soon. And slide them together.Picture 3

Step 8: It's Time to Put It All Together. Part 1

It's time to put it all together. First add a yellow/gray rod to the body.Picture 1 Then add white rods to both sides.Pictures 2-3 Now add the pivot point and arms to the rest of the body.Picture 4

Step 9: It's Time to Put It All Together. Part 2

First add the dial to the body.Picture 1 Then add this brown/orange connectorPicture 2. Finaly we can add the baskets.Pictures 3-4 Do the same on both sides.

Step 10: You're Done!!

Congratulations you're done!!

Now to use it just put things in both sides. You can tell it's balanced when the pointer points to the middle slot in the white connector.

If you have any questions let me know.
Killer~SafeCracker

Comments

author
OlgaN2 made it! (author)2016-03-18

Excellent instructions! Thank you! Beats buying $30 worth of teaching balance scales

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author
chopstx (author)2009-09-25

A kind FYI: Pictures 2 and 3 are misordered. I would appreciate it if you corrected this problem. Any way, Awesome! I am actually in the middle of building this now!!!!!!!!!!!!

author

Fixed

author

I finished building it! It's so cool!!!!! Do you mind if I make an instructable using this?

author

I guess not. Do I get a little credit??

author

Well....................OF COARSE!!!!!

author

Sure.

author

Just so you know, It's nothing special. It's just what a white rod equals and such(in weight of coarse!)

author

Ok sound cool.

author

Kinda boring but I need something to post.

author

How's it coming??

author

Sorry, I was working on that, but then I decided I would work on my SKAK.

author

Are you still going to work on it after the contest??

author

Um..........maybe, maybe not. I probably won't though. Why?

author
~KGB~ (author)2009-08-18

lol! just asking?

author
Killer~SafeCracker (author)~KGB~2009-08-18

It was 7:43 am. What time was it where you live??

author
~KGB~ (author)Killer~SafeCracker2009-08-20

it was 11:10

author
Killer~SafeCracker (author)~KGB~2009-08-20

Do you live in NY??

author
~KGB~ (author)Killer~SafeCracker2009-08-21

no. wish i did!

author
Killer~SafeCracker (author)~KGB~2009-10-24

A little late, but lol.

author
~KGB~ (author)Killer~SafeCracker2009-10-25

lol!

author
knex_mepalm (author)2009-08-20

i bought a set in aus and i think you copied the idea, but better than it, so maybe 2.0

author

I would never copy a set. There is no point in it. Also did you rate it down. Because it's down like 1/2 a star.

author

i rated 2.0*

author

Why??

author

It feels like so much more could be dont, but wan't I'll rate it 4* I changed my mine, its harder to make one than expected.

author
mettaurlover (author)2009-08-27

in step 2, you got pics 2 and 3 mixed up.

author

Thanks I didn't see that

author
knexsniper1 (author)2009-08-19

just wondering, but wont the arms collapse under all that weight? either way, great job!

author

That depends on the strength of your connectors.

author

i gues, good job!

author

Thanks

author
lemonie (author)2009-08-18

Very good, since someone just asked me - how much metal can you load onto this (grams)? L

author

It will hold about 900 grams or 2 pounds per basket.

author
NYPA (author)Killer~SafeCracker2009-08-19

I bet it can hold a lot more with tan rods.

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Killer~SafeCracker (author)NYPA2009-08-19

Yes, Yes it will

author
NYPA (author)Killer~SafeCracker2009-08-20

Too bad i only have one.

author
Killer~SafeCracker (author)NYPA2009-08-20

Yep I have like 6.

author

I'd like to see that (for how much it bends) - can you add a pic? L

author

Ya I'll try to get one soon.

author

2 lbs? that's an awful lot.

author
Owenmon (author)2009-08-19

Nice! this is a very good idea. 4.5*

author

Thank you.

author

No problem!

author
smilee (author)2009-08-18

Wierd there are two ofthese in my recent page!

author

Thats odd. Comments keep going away as well

author
s0lekill3r (author)2009-08-18

Nice, simple design. Great job.

author

Thanks man. Glad you like it.

author
~KGB~ (author)2009-08-18

pretty creative. 5

author
Killer~SafeCracker (author)~KGB~2009-08-18

Thanks

About This Instructable

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Bio: Im Killer~SafeCracker, I started using Instructables in 2009. I mainly post in the Knex world, but I venture out sometimes. Check out all my ... More »
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