MasterCAM Other Operations Tutorial
MasterCam does have tools for making lines, circles, etc, but … MasterCAM Other Operations Tutorial. Rough/Finish Pocketing Parameters. Peck Drill Parameters …
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MasterCAM Other Operations Tutorial Pocketing Pocketing is simply the method for removing material from concave areas of a part. A pocketing toolpath is set up like any other, but in a special tab in the Parameters dialogue box are a num- ber of pocketing-specific options. Most importantly, the stepdown, whether or not a finish pass is desired, and the pattern the bit will follow to remove material should be set. Chains are used to select the geometry that defines a pocket, so only a 2D contour or set of lines is necessary. The spiral pocket path without a finish path is highly effective and huge improvement over the nor- mal X or Y zig-zag because it traces the edges and removes the teeth round bits inevitably leave. When designing the pocket geometry, either in 2D or 3D, remember that the radius of the bit will be left at all corners. Depending on the design of the part, there may b an opportunity to make the pocket larger than needed to deal with the radii in the corners. Drilling Drilling is best done using a drill bit. All flat end mill bits will make uniform holes, but often burn the material because they are not designed to remove the material from a hole while cutting. Countersinks are best made with end mills. The two most common types of drill paths are Drill/ Counterbore and Peck Drill with the difference being whether the full depth is taken in one mo- tion or multiple. Peck drilling parameters consist of Peck and Subsequent peck where positive values set how far each peck will drill. When designing geometry to signify a drill hole, either a crosshair or circle will work well. Snaps in MC are similar to in CAD, but must be cho- sen before each new selection (use letter keys to speed job). Select crosshairs by snapping to Midpoint (more reliable than Intersection). Se- lect circle centers by snapping to Center. These selections are considered manual , but there are automatic ways to select all entities in a eld of possible drill holes. Creating Geometry and Basic Editing in Mas- terCam MasterCam does have tools for making lines, circles, etc, but they re generally pretty clunky. It is possible to rely on the ability to make a simple line (Create>Line), and to move (Xform>Translate). Avery Fabrication and Material Conservation Laboratory MasterCAM Other Operations Tutorial Rough/Finish Pocketing Parameters Peck Drill Parameters Materials and the Mill These numbers are general upward limits of what the mill can handle per pass. MDF .25 at endmill – .33 max .5 at endmill – .4 max .5 ball > .33 max Rangerboard .25 at endmill – .18 max .5 at endmill – .25 max Burning & Melting Burning is the result of the bit becoming too hot as it is making a cut. In addition to the risk of re and the marginal aesthetic of a blackened piece, hot bits are more likely to dull faster and break. The way to combat burning is to keep the tool moving fast, that is to say running the path at a high speed regardless of spindle speed. To run at a high speed (225 or greater), it is necessary to design paths with low enough stepdowns that the spindle will not meet too much resistance and stop. Spindle speed should usually be at the maximum, but certain materials respond better to a slower speed. Using the Library to Resuse Paths Any de ned toolpath can be saved to a local library le, either with or without geometry. Maintaining a li- brary of common paths (like ball bit contour cut on foam) will save time in pathing. From the Operations Manager, right-click on the name of a de ned path>Save to Library. Library Group Name is the group the path will be listed under. Check or uncheck Expost operation s geometry defending on future use. To import a path, right click in the white background of the Operations Manager>Get from Library. Once path is imported, either with or without operations group (No is generally easier), select the green and black Geometry icon to add the entities that constitute the part. Regen Path.
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