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Robot Arm

I always wanted a third arm

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Construction of an open source precision five axis robot arm.

Design to handle a 10 Kg load.

Simple design using nylon plastics.

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  • 1
    Step 1

    Rotary Base Construction:

    Here is the rotary base. I machined a disk 8" in diameter and 1" thick from nylatron. I then cut out the internal shape and atached a Gates notched belt to the internal surface with Gorilla glue.

    The second 8"x8" nylatron blank was machined to hold the disk. The pinnion placement was measured and drilled for a perfect alignment to the internal ring gear.

    The disk sits on the base and turns very smoothly. The pinion has 12 teeth and the belt 116 teeth. This gives me a ~ 9.66 to 1 reduction.

    A window regulator motor is connect to the pinnion by a coupling.

  • 2
    Step 2

    The elbow joint is complete. A stainless steel cable will control the position and remove weight from the outer end.

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Tr2sa wrote 12/08/2015 at 08:00 point

The inside use of toothed belt is nice idea. One has to be careful with belt load rating - typical number of teeth engaged is way higher (5...6), so there is need to downgrade maximum allowable load accordingly.

  Are you sure? yes | no

Joseph Lavoie wrote 12/08/2015 at 17:52 point

Yes the rotary base will be the only one with this design ; not alot of force on it.

  Are you sure? yes | no

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