Hydraulic arm

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Hydraulic Arm
Build Guide

A guide for building standard and advanced hydraulic arms

Warning: CHOKING HAZARD. Small Parts. Not for Children Under 3 yrs.

Copyright © TeacherGeek 2007

Hydraulic Arm


“Kit” Can Be a Bad Word:
Don’t think of this as a kit. Think of it as a bag full of endless solutions. Although the end of this guidecontains step-by-step instructions for creating a hydraulic arm, we encourage you to try and develop new and different designs. Because, in design and engineering, there is never one right answer… TeacherGeek Easy Engineering Series products allow for great innovation and alternative designs. Because, your first idea is rarely your best… TeacherGeek Easy Engineering Series products are designed to beredesigned; they allow you to quickly change and evolve your designs. Because, possibilities are endless… TeacherGeek Easy Engineering Components can be easily combined with other materials and products (Recycling, wood, metal, broken toys, etc.)

Hydraulic Arm Competition Ideas:
Design an arm that will: · reach the greatest distance to deliver a given object · pick up the heaviest possibleobject · deliver the most objects in a given amount of time · function in an assembly line · have a system to weigh the object it picks up · battle against another arm for an object · rotate as well as reach and grab · dig and recover objects

Dowels vary in diameter because they are made of wood. We have provided you with extra dowels to make up for dowels which may be too large or too small to use.*When constructing your arm, only use dowels which fit properly. Odd sized dowels can be recyled and used on other projects.

Other Documents That Could Help You With This Activity:
Document: Easy Engineering Guide Easy Engineering Ruler Fluid Power Lab Path:


teachergeek.org/easy_engineering_guide.pdf teachergeek.org/ruler.pdf teachergeek.org/fluid_power.pdf

Access Code: NoCode Required No Code Required No Code Required


Copyright TeacherGeek © 2006

Hydraulic Arm


Dowels and Holes
Easy Engineering™ Components come with holes made for a press fit.

A press fit is one where the dowel is fixed and not able to rotate or slide once it’s in the component hole. A press fit is good for creating rigidstructures.

Press fits are good for structural connections.

Press fits are good for gears, pulleys and levers that turn together on the same dowel (axle).

Reaming Holes
The reamer creates a hole that dowels can freely rotate in and slide through.

The crank and pulley are press fit (not reamed) on the dowel so they turn together.

The dowel moves freely in the loose fitting hole.The link strip holes that the dowel needs to rotate in were reamed to make them larger The Reamer creates a hole that is larger than the dowel.
http://www.teachergeek.org/hydraulic_arm.pdf Copyright TeacherGeek © 2006

Hydraulic Arm
Easy Engineering Guide Excerpt


How to Ream Holes

Screws can be used to attach two components together.

Pull and push the reamer inand out of the hole.

The hole the screw will enter first must be reamed “loose.”


Turn the reamer inside the hole. To further enlarge a hole, as you ream it, move the end of the reamer around so it is not in line with the hole.

The hole the screw will enter second should not be reamed. Turn the screw into both components.

Slide-Stop Material

Slide-Stop Material comes in longlengths. It must be cut into 6mm (~1/4”) sections before it can be used.

Slide-Stop Material keeps dowels from sliding back and forth in “loose” reamed holes.

*Be careful not to over-tighten the screw and strip out the bottom hole. Tighten the screw completely to keep components from rotating. Leave the screw a ¼ turn from tight to allow components to rotate/pivot.
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