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. I purchased the 5x Greembull recently and was hoping I could get some advice and/or plans for the torsion box and table
A torsion box is a way to create a dead flat surface for the CNC router. A torsion box consists of an internal grid of wood that serves as the structure and a top and bottom layer sandwiching the internal grid layer. Here is an excellent resource on how to make a torsion box. http://www.core77.com/posts/26334/A-Look-at-Torsion-Boxes Make sure to leave 2 inches or more overhang on the top layer (3/4" thick) to make room for the rails and the chain mounts.
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All of the pics and videos show your cncs cutting sheet materials, I'm interested in carving 3d images in plastic and hardwood slabs up to 2" thick. What machine and software would you recommend?
All of our CNC machines can carve at that depth without a problem and do 3d carving. Our typical application is cutting sheet materials, but a good percentage of our customers cut 3D bas reliefs or even more complex 3D objects using reference points and jigs. Most of our CNC machines have a Z travel of at least 6 inches for the smaller machines and 7 to 10 inches for our larger machines. The Fabricator Pro has a Z travel of 10 inches. Depending on your application, you will need to consider the length of the end mill (more than the deepest depth of the 3D carving) and the stock that you will be using. If the stock plus the length of the end mill exceed the clearance with the Z axis raised to the top extent, then you will need to consider the way the table/bed of the machine is formed (maybe with a depression to take advantage of the greater need for clearance). The greenBull has the capability of Z axis travel of up to 36 inches, but I would recommend, if milling wood, that the Z-axis not extend more than 12 inches to reduce deflection. Additional Information: Most of the CAM software on the market will have 3D profile machining operation capabilities. CAMBAM has a very nice 3D prpfiling feature. The Vectric line of software can definitely handle this as well.
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Can the long-Z version do the same work as the short-Z?
the only difference is the long-Z can travel further.
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heavy duty 4x8 od z tower height /thanks
The Z axis travel on the heavy duty 4x8 greenBull CNC machine is 8 inches.
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Are the motors for the 5x suppose to operate at a high temperature?
Yes, all of our stepper motors will run hot, depending on the way it is operated. Energy comes in a few forms, light, motion or heat. If the stepper motor is not moving, it is typically holding its position, which will cause the energy to transform to heat energy. If the stepper motor is holding a load, and is moving, it is drawing more current and the energy will be in the form of heat and motion. It is totally normal for stepper motors to be hot to the touch.