Tutorials Mill Level 1 Training - TechEdu.com

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Mill Level 1 TUTORIAL 7From the extended Tree view list, select Roughing and select as cutting method Constant OverlapSpiral.Stepover percentage sets the distance between roughing passes in the XY axis as apercentage of the tool diameter and will automatically update the stepover distance.Minimize tool burial clears the area around pocket islands (semi islands in our case) toavoid tool damage due to removing too much stock at once.Spiral inside to outside enabled allows you to spiral from the center to the pocket wall.Display stock for constant overlap spiral previews the amount of stock removed by theroughing passes.Tolerance for remachining and constant overlap spiral determines the accuracy of thetoolpath when using one of the two options. Recommended tolerance is the default.Select the plus sign in front of the Roughing to expand the Tree view list, andselect Entry Motion (if needed).Enable Ramp options and change the parameters to match the following screenshot.The ramp length value will be determined by Mastercamand can not be smaller then the Minimum length or biggerthen the Maximum length.Z clearance sets the height above the stock where theentry ramp will start.XY clearance sets the minimum distance in the XY planebetween the ramp and the pocket wall.Plunge zig/zag angles set the ramp angles as the tool zigzagsto the bottom of the pocket before beginning thecutting pass.Auto angle sets automatically the angle in the XY planebased on the longest area of the pocket.Additional slot width adds a fillet at the end of each rampfor a smoother tool movement.Page 7-61
Mill Level 1 TUTORIAL 7Select Finishing and disable the option as with this operation we want to rough only the part.From the Tree view list, select Depth Cuts and enable the option.Depth cuts are the Z axis cuts that the tool makes in a pocket toolpath.Max rough step sets the maximum amount that can be machined in one step.By pocket enable the system to complete all depth cuts in the first pocket before movingto next one.Mastercam never performs unequal depth cuts. For example, in our case, the left side pocket is 0.375deep; the step is calculated: (0.375-0.02)/2 = 0.1775 which is smaller then 0.3. The same way the systemcalculates the step for the second pocket; (0.75-0.02)/3 =0.2433Page 7-62
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