The Claw.

This is how to build... The Claw.


The Claw is my awesome 3 fingered robotic gripper. it is controlled with a servo, and can be attached to another servo which acts as a "wrist".

To see what it should look like, there is a video here http://www.youtube.com/watch?v=-R7vCUfmeNU.

(for the NRW contest, I am 15)

Step 1 Laser cut the pieces

Below are the DXF designs to laser cut the pieces. It should be fairly self explanatory. If you don't have access to a laser cutter, then the designs are also below.

You will also need:
3 x 3mm bolt
3 x 3mm nylock
some multicore wire
some 3mm dowel
3 small pull springs
glue
a drill
a servo
4 x 4mm bolt
4 x 4mm nut

Comments

[rpjamess1]

I made a claw using three one time but they were set with a two-one configuration, not circular like this. I used rubber bands instead of springs but have another thought. What about two wheels connected to the servo, feeding wire as in your plan, closing the claw, and the other feeding the opposite way to where the springs are attached? This would make the open and close completely dependent on the servo and no need for the springs.

[AntMan232]

I thought about rubber bands, but decded springs were probably better. Also, I came up with your idea about wires pulling both ways myself, but it was simpler to build using springs. Thanks for the feedback though!!

[rpjamess1]

The springs are a much better idea. After about three days of playing with the design we had to replace the bands because the snapped. Let me tell you about the pain my hand went through while fine tuning everything...

[hlugo]

i saw your claws and arm with wrist on youtube and i just have to say they are great. im just wondering if you have this in a CAD file that i could use?? im trying to make the claw cuz it looks awesome.

[AntMan232]

I can't release the files for the wrist and arm, because they are part of my IGCSE project, and the exam board might get funny. The file for the Claw above, though, is attached.

[tinker234]

hey could i use a dremel

[AntMan232]

So could I...

[tinker234]

so i can just use my dremel

[Whitestar245]

This is most certainly the best set of instructions for a 3-pronged claw that I've found after quite a bit of searching.
I'm looking to do one with a slightly different design, though, similar to this one:

http://www.clawmachinesdirect.com/claw.jpg

Of course, I know next to nothing about laser cutting, and can't edit the dxf file myself...
If anybody could help, that would be great!

Also, what is the scale of this?

[AntMan232]

The whole assembly is about 20cm long. If there is a better filetype for you, just ask and I will send it to you. If you want to edit DXFs, then i can recommend QCAD or Draftsight. Please send me a photo if you make one.

[The Ideanator]

Very nice, this could be quite useful in some evil world domination robot! You should post the drawings to thingverse too...

[uberzombiebob]

its a dalek claw isn't it?

[The Ideanator]

I thought the Dalek's had a toilet plunger, not a claw...
But still, it is an excellent addition.

[JavaNut13]

They only had a toilet plunger because the BBC couldn't afford grippers..

[AntMan232]

You wouldn't say that to a Dalek's face...

[The Ideanator]

Not if I get all Bad Wolf up in its, uh, eyestalk thing.

[uberzombiebob]

some daleks have plungers others have claws, flamethrowers, extra weaponry and assorted other tools depending on their assignment.

[AntMan232]

That is the eventual plan! I will be using this as part of my GCSE project for tech, the project is technically a teaching aid, but ...

[ckpirate]

Great instructable! By the way Maxwell Smart was Agent 86, Barbera Feldon was Agent 99.

[Dumchicken]

is this like the claw shot from legend of zelda: twilight princess?

[AntMan232]

No.

[burnerjack01]

Hilarious! Great response!

[caarntedd]

The Craw!

[burnerjack01]

No! Not the Craw, the CRAW!!

[gannon12raiders]

Not Craw, Craw!

[AntMan232]

???

[shadeydave]

It's a reference to "Get Smart", the american spoofy spy TV show from the 60's. Agent 99 (Maxwell Smart) had an Asian supervilan enemy called "The Claw", but due to an unfortunate and racist play on his accent it always came out "CRAW!".

[AntMan232]

Sorry, I'm about 40 years younger than i would have to be to have seen that!

[dombeef]

This is just like the claw I made and instructable for, though your's is motorized, good job!

[dombeef]

It is also exactly one month after the one i made's date when I posted it on instructables

[AntMan232]

To be perfectly honest, I have never seen that before today, and there really isn't much resemblance. I designed mine on my own at home here in QCAD.

[Tomcat94]

No one can escape THE CLAWWW!!!!

Great instructable. I just wish I had the materials to make it....

[twolf1]

perfect for a big duo cosplay x)

[mr.incredible]

Awsome job. For anyone who wants to get something laser cut go to Ponoko.com Cheap, lots of materials, and about 10 days shipped. I like the bamboo plywood.

[baneat]

The Claw is our Master! He decides who will go and who shall stay!

[aashilrv]

LOL I love toystory........!!!!!!!!!

[AntMan232]

You have the right idea!

[Kiteman]

Is this your own design, or one you've gotten from somewhere else?

[AntMan232]

I designed this all myself. This is the 3rd version, if you follow the youtube link and look at my other videos, you will see the 2nd version. I have been revising and developing this for a while!!

[Kiteman]

That is great - it's just hard to tell when there's no handwriting on the designs...