Introduction: Skeleton Arm, Made by Penguin Manufacturing

Picture of Skeleton Arm, Made by Penguin Manufacturing

Welded sculpture of a human arm.

Step 1: Tools

Picture of Tools
  • MIG welder with Argon/CO2 75/25
  • Plasma cutter,(Or anything to cut steel Plasma Cutter is preferred)
  • Bench grinder
  • Angle grinder
  • MIG pliers
  • Wire brush
  • Safety gear: Leather gloves, jacket, welding hood, safety goggles.

Step 2: Materials

Picture of Materials

From left to right...

  • 3/8 in. all thread bolt, 9 in. long (16 TPI) 1x
  • 3/8 in. all thread bolt, 8 1/2 in. long (16 TPI) 1x
  • 1/4 in. 3 in. long hex-bolt (20 TPI) 4x
  • 5/16 in. 2 in. long hex-bolt (24 TPI) 2x
  • 5/16 in. 1 1/2 in. long hex-bolt (24 TPI) 12x
  • 5/16 in. 1/2 in. long hex-bolt (24TPI) 1x
  • 5 in wide, 6 in long U-channel (5mm)
  • 1/2 in. nut 9x

Step 3: Make a Base

Picture of Make a Base

Cut U-channel into a roughly 5' by 6' block for the base of the structure.

Grind with angle grinder to get a smoother non-rusted surface.

Step 4: Make Ulna and Radius.

Picture of Make Ulna and Radius.

Grind 45 degree angles into both all thread bolts to make "ulna" and "radius" bones.

Step 5: Ready to Weld!

Picture of Ready to Weld!

I found the optimum voltage for this project to be 20 volts.

Step 6: Tack, Tack, and More Tack.

Picture of Tack, Tack, and More Tack.

Arrange the pieces as shown.

Tack weld the ulna and radius angle side down.

Weld the nuts on as wrist bones.

Tack weld the rest of the bones on piece by piece as shown until you have a skeleton arm!

Step 7: Cleaning

Picture of Cleaning

After welding it all together take your wire brush and brush off any residue, (from welding zinc).

Use an angle grinder to clean welds up, and you're done!


Dr.Duckhunt (author)2015-02-26

Nice job! I mad a couple hands last year out of old sockets, now I've got to get around to making the rest of the body

I have wanted to make a full skeleton since I got the idea of making a hand. Probs gonna be my next project. ( ͡° ͜ʖ ͡°)

Dr. Duckhunt those are super creepy! They almost look like mummified hands!

eruger (author)2015-02-27

Good one!

If those bolts are coated, plated, or galvanized though you'd better use a respirator too. Not stuff you want to breath!

Had a woman in one of my Sculpture classes that made armatures this way for life-size clay figures, made a mold and hollow plaster cast, broke the casting up, then mounted (most of) the pieces on the armature, which had acquired a deep rust patina by then. Nuts and bolts were a whole lot cheaper then though.

amberrayh (author)2015-02-26

Your sculpture turned out really nice. Thanks for sharing! I hope we see more from you in the future!

BrandonSmith16 (author)amberrayh2015-02-27

Thank you, I appreciate the support.

gravityisweak (author)2015-02-27

I love this! Simple yet very much like a skeleton at the same time. Really really cool!

Dr.Duckhunt (author)2015-02-26


About This Instructable




More by BrandonSmith16:Skeleton Arm, Made by Penguin Manufacturing
Add instructable to: