In the movie Harvey the main character could see a giant rabbit named Harvey. Other's thought he was nuts! The Pooka 4th Axis falls into that same catagory. In CNC there is a X, Y and Z axis. Then why are there boards that will drive a fourth axis? Some people use the X and W together to drive a gantry style mill. In fact there are Rotory tables out there. They rotate the piece as it is machined. On older machines the Y or X axis could be disconnected in order to run the rotory table. Some people call this the Fourth axis. A rotory table costs any between $800 and $5,000. What are they used for? Cutting gears and making items like chess pieces. Nobody talks about building a rotory table. I did see one once made out of plexi-glass. It was belt driven. Someone was trying to sell it for $300.
Ok here is the deal. I designed a cheap 4th axis. The table will uses a set of gears from Boston Gear. Local Boston Gear dealers will let you buy them with just a credit card. The table won't do every angle the $800 dollar ones will. It won't have the power either. The unit uses a Worm gear so backlash won't be too bad. Basically this design will be for screwing around! This unit is for the advanced experimentor-programmer.
My design is very easy to build. I include a diagram for a step/direction circuit just in case you don't have a four axis controller. This unit can be driven by the Piker 1X controller off the connector of your 3 axis controller.
The output shaft moves .0045 degees with each step of the motor. This unit can be built for under $75.00 US. The plans will show how to build the unit in the picture. Two gears, a floppy drive stepping motor and some PVC and you have a simple 4th axis. Nobody has this!!! I want $23 which includes free shipping and handling. I only sell and ship US and Canada.
Email: John a quick question.
Home Info Plans Order Links Pics