3D Roughing

3D Roughing is used when machining 3D parts, to clear away excess material when the part is too deep for the finishing tool to cut in a single pass.

3D Roughing requires a single surface or polysurface to machine. You will need to place this surface into the following layer in the Rhino document:

KaroroCAM/3D Roughing

NOTE: Currently KaroroCAM can only process one surface/polysurface at a time - you will see a warning if you have 2 or more surfaces in the above layer.

Tolerance

KaroroCAM uses polylines (collections of line segments) to create toolpaths. All curves are converted to segments using this Tolerance setting as a guide.

Outside Corners

This menu allows you to switch between Sharp and Round outside corners on your toolpaths. 3D Roughing toolpaths are an offset from curves that represent slices through your model. These two options being the difference in how offsets can be calculated on internal cutout offsets. 

NOTE: Sharp corners can lead to smaller G-code files.

NOTE: Rounded corners are effected by the toolpath Tolerance setting. 

Cut Order

This menu allows you change the order of the cutting. 

Outside -> Inside starts on the outer most path in the layer and works towards the smallest path - this is suitable for 3D objects that are mostly convex - i.e. half a sphere

Inside -> Outside starts in the smallest path in a layer and works towards the outer most path - this is suitable for 3D that are mostly concave - i.e. a bowl or dish

Tool

Tool Shape

3D Roughing uses Flat End Mill tools

Tool Diameter

Sets the diameter of your tool bit in mm.

Tool Number

Select Tool number that matches the tool spec'd in your tool path - mostly important for machines with auto tool change ability.

Spindle Speed

Sets the spindle speed for this operation in your GCode output file

Step Over

Step Over

Sets the step over between offset passes in the 3D Roughing

TIP: Good practice is to set this to 50% of your tool diameter or less

Tool Containment

This menu give you three options to contain the 3D Roughing toolpath on the side of model surface:

Stock to Leave

Stock to Leave

This setting allows you set an additional offset to you cutting path to leave some extra material on the outside of the 3D surface

TIP: This setting is commonly used in a 3D Roughing/3D Finishing toolpath combo - leave 0.5-1mm of excess stock on the 3D Roughing toolpath which will be removed with the 3D finishing path.

Multiple Depths

Max Step Down

Maximum step down in mm per pass in your 3D Roughing tool path.

Ramping

USE RAMPING

Check this box to enable ramping tool entry into the stock.

Ramping Angle

Sets the angle the tool will enter the material at the start of each cutting pass.

NOTE: You may get a warning if one or more of the cutting paths is too short to contain the ramping motion. Either increase the ramp angle and/or reduce the cutting depth per pass to allow for a ramping motion that is suitable for your 3D Roughing. 

Post Process

Post Process 3D Roughing

Click this button to proceed to the Post Process Selection and Gcode File saving