My first new machine for 2017-The rotary duplicator.
 This machine carves wood and make shapes. It can be operated in three modes:
1. As a CNC guided carving tool.
 The rotary cutter is guided by raising and lowering the tool against the work through code in CNC mode while the X axis moves the cutter along the length of the work. The cutter speed, the axis speed/direction and the rotary speed are all used to produce a new part.
2. As a straight line duplicator.
 The top pattern is followed by a stylus which guides the rotary tool below against the work. The X axis sweeps back and forth and each pass lowers the tool bit deeper into the material making the process hands free and requires no controller.
3. Non concentric duplication.
The top pattern is perfectly synchronized with the lower work piece to produce off center, or odd shaped items. A timing belt assures the top follows the bottom.
 The entire machine is 3D printed and uses simple, inexpensive motors available from Ebay(about 2$ each). Each spindle has its own motor for pattern/work turning, and the top can be synced with the bottom by loosening the arbor set screws and attaching a 200mm timing belt from top to bottom. 
The X axis is using a small stepper motor attached to a leadscrew for carriage movements.
 The cutting tool motor(5$) has a small chuck(2$) to hold 1/8 inch rotary tool bits and sanding drums to do the carving.
The motors are all driven using off the shelf speed controllers to accommodate various woods. It looks rather complicated as far as wiring, but its all very straight forward.
 When running it looks like a living organism. Each motor is moving when and as it should and as material is removed the part takes shape.
 It does make a bit of a dusty mess but containable. Does not make too much racket, mostly just the cutting motor. The printed parts consumed 250 meters of filament. The full set of parts cost about 25$. The base is acrylic and has a footprint of 16" X 5 " although some parts of the machine do overhang. This was by design to keep shavings from falling into the X axis lead screw below.
 I have found that on softer woods a 1/4 inch band sanding drum works great and makes a satin smooth finish on parts. Maximum stock size for this machine is 2" square X 8 inches long.
This machine is scaleable-It can be made larger.
 My goal is as always to design and make inexpensive 3D printed machines that make.
 Earlier machines can from years past be seen on my profile page.
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2017-01-08
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