Generating the correct unit in output is the responsibility of the post-processor and is done only at that time.Changing your preferred unit schema will have no effect on output but will help avoid input errors.If you design in US units, either the Imperial Decimal and Building US will work If you're a Path user and prefer to design in metric, it's highly recommended that you use the "Metric Small Parts & CNC" schema. Changing schema in preferences changes default unit string for the input fields.Most post-processors will automatically convert the unit when generating gcode. Most CNC machines expect feed rate in the form of either 'mm/min' or 'in/min'.If you're using the default schema and you enter a feed rate without a unit string, it will get entered as 'mm/s' The default unit schema uses the default units.This is what FreeCAD stores internally regardless of anything else FreeCAD base units for length and time are 'mm' and 's' respectively.Look for possible collisions with clamps or other obstacles along the paths. If necessary, model your clamping mechanisms in FreeCAD in order to better inspect the paths generated. Consequently, please review and simulate the paths you generate prior to sending the code to your machine. The operations within the Path workbench are not aware of clamping mechanisms in use to secure the model to your machine.Most operations in Path workbench will return paths based on a standard endmill tool/bit only, regardless of the tool/bit type assigned in a given tool controller with the exception of the Engrave and 3D Surface operations.Most of Path workbench is designed for a simple, standard 3-axis (xyz) CNC mill/router, but lathe tools are under development in 0.19_pre.However, there are two tools which produce true 3D paths: 3D Pocket and 3D Surface (which is still an experimental feature as of November 2020). This means that they take a fixed 2D shape and can cut it down to a given depth. Most of the Path Tools are not true 3D tools but only 2.5D capable.Some current limitations of which you should be aware are: That the Base 3D model quality supports the Path workbench requirements, passes Check Geometry.Holding tag parameters are defined in the Edit → Preferences → Path → Dressups tab.Colors are defined in the Edit → Preferences → Path → Path colors tab.The Macro file path, and Geometric tolerances, are defined in the Edit → Preferences → Path → Job Preferences tab.The Postprocessor configuration defines the final G-code units. The FreeCAD 3D model units are defined in the Edit → Preference → General → Units tab's Units settings.The Path Workbench has external dependencies including: It links the Postprocessor, and allows importing and exporting Job Templates. The Path Workbench provides a Tool Manager (Library, Tool-Table), and G-code Inspection, and Simulation tools. The list is populated by adding Path Operations, Path Dressups, Path Supplemental Commands, and Path Modifications from the Path Menu, or GUI buttons. The Job Workflow lists these in the order they will be executed. The G-code is generated from directives and Operations contained in a Path Job. The Path Workbench generates G-code defining the paths required to mill the Project represented by the 3D model on the target mill in the Path Job Operations FreeCAD G-code dialect, which is later translated to the appropriate dialect for the target CNC controller by selecting the appropriate postprocessor. This step is called post processing there are different post processors available. Export the job with a G-code, matching to your machine.These Path objects use internal FreeCAD G-code dialect, independent of the CNC machine. Path Tools are selected as required by the Job Operations.This contains all the information required to generate the necessary G-code to process the Job on a CNC mill: there is Stock material, the mill has a certain set of tools and it follows certain commands controlling speed and movements (usually G-code). A Path Job is created in the Path Workbench.A 3D model is the base object, typically created using one or more of the Part Design, Part or Draft Workbenches.The FreeCAD Path Workbench workflow creates these machine instructions as follows: A general CNC lathe tool path sequence simulation example is presented here. Typically, instructions are a G-code dialect. These produce real-world 3D objects on CNC machines such as mills, lathes, lasercutters, or similar. The Path Workbench is used to produce machine instructions for CNC machines from a FreeCAD 3D model.
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