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Sometimes scaling causes data loss issues from Rhino to Mastercam. Milling isn't a simple printing operation where you can scale everything down to fit on a page while sending it to the machine. If you will be cutting the model from 3" foam, make sure all of the geometry is scaled to fit within the 3" of working height. Prior to working in Mastercam, your geometry must be scaled to the size your final model will be (1:1). So, it's important that you work with geometry that is at this same scale and in the correct units for the machine. When you start to apply toolpaths and select tools in Mastercam, all of the settings will be at the scale of actual machine motion and physical tooling. Position all geometry within the modeling environment such that a clear relationship to the machine's coordinate system is created.Create a bounding box that defines the volume of your stock material.Work with a layer organization strategy that makes it clear how the geometry will be used in Mastercam.Create the necessary geometry for the toolpaths you intend to use.Work near the origin of the modeling environment.Work at the scale of the actual model, rather than the scale of the architectural body being represented.If you want to do more and venture beyond the template files provided, you might want to look at the page on Choosing Toolpaths of this tutorial about different toolpaths and the geometry types that are used with them.Īt minimum, to prepare for Mastercam, you will need to: The geometry that is needed to adequately configure this file is discussed on the "Assign Geometry" section of Setting up a Mastercam File. To make this easier, we provide Template Files that embody an approach to removing material to define a surface-based model. The logic behind particular tool paths will ask for different types of defining geometry, so it's a good idea to know how you want the machine to remove material from the part before you create the geometry in Rhino that will be used to define the tool paths. To be able to help you, however, we need you to start the process by creating the geometry necessary to describe your part for the mill.Ī file that is suitable for Mastercam and the milling process is not necessarily the same file that you use to make renderings or to produce a model from which you can make a 3D printed part. At the GSD, the process of using either of the two CNC Routers requires you to engage in this process somewhere in the middle of this spectrum by providing you with template files and the assistance of experienced users. Other machines require more involvement, both in creating the file that defines the tool paths and in the operation of the machine itself. The Roland Modela 3-Axis Desktop mill in the woodshop is an example of this type of machine.
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Some CNC milling machines come with proprietary software that can make the process as simple as: importing a mesh surface, making a few decisions regarding desired part resolution, and then hitting "go" on the machine once you've secured the material. Software that generates toolpaths for 3-axis CNC routers and mills will generally work with surfaces, meshes, curves, and points, depending on the particular motion that is being created for the machine. There are a number of different software tools that can create toolpaths from geometry (some require a closed mesh model, like an STL file to a 3D Printer, others work only with 2D curves, like a DWG file for a laser cutter). The geometry that you create in Rhino or another 3D modeling program of your choosing will ultimately control the motion the cutting tool takes through the material to make your part.