It’s too easy to break the tool otherwise. Set the feedrates for the operation, I dial these way back to 100mm/min for my little mill on acrylic.Select your freshly created tool and press OK.Press OK when finished entering in the details. Those helical troughs that spiral up the side. The only that might not be obvious is ‘Number of flutes’, a flute is the channel in the side of the bit. I used a set of digital calipers to make all the measurements. Select the cutter tab and fill out all the details for the milling bit you are going to use.

Create a new tool using the buttons in the top right of the select tool dialog.

Press the ‘Select…’ button next to tool.

Select the ‘3D’ menu and press ‘Pocket Clearing’.

The first is to clear out all the holes in the piece, some of these are countersunk, so we will use ‘pocket clearing’ for this. Now we are ready to start giving actions for our CNC mill to perform. Set the top offset to 0mm (assuming we will be cutting this from material that is the same thickness as the part) and press OK.

Bump the side offset up by to 5mm, to give us a bit of a margin when cutting the part.

Click one of the points on the top of the yellow semi-transparent stock box.

Select ‘Box Point’ to select a stock point to be the origin for our job.

Select the axis we want to use for Z, in the pictured example, the green axis is used.In the Setup tab, select the orientation drop down and click ‘Select Z axis/plane & X axis’.We need to set the coordinate system such that the Z-axis points up, while the x and y-axis from the a plane matching the top of the stock (the yellow semi-transparent box). Most importantly, it lets us setup how our stock will be orientated in our mill. It lets us tell Fusion a few details about the stock, or the material we will be using to cut the part from. A setup holds general properties about the milling job.

Fusion 360 cnc 3018