For the bottom set up again use the stock from previous setup and same XY origin. (ex: do normal 3 axis milling on one gcode, rotate the part, then do. Now dowels in the spoil board connected to the top of the stock will position the part for the bottom operations. This is a new feature in the January 2023 update of Fusion 360. Fusion 360 allows you to create your own tool path simulations and access the latest CNC programs for your metal cutting tools and machining strategies. You can do indexed machining aka 3+1 machining with the free version of Fusion 360. The Fusion 360 Machining Extension is a cost option that unlocks additional CAM capabilities inside Fusion 360, allowing you to make better use of your. These will drill down into the spoil board. Create the drill tool path from the sketch points. So if your XY origin was on the bottom left corner in the top setup and you flip along the X axis the XY origin will be at the top left corner in the spoil board setup. Keep the XY origin at the same place on the stock but z starts at the bottom of the stock next to the spoil board. The part is flipped 180 along an axis so the stock and sketch points are flipped too. Now you need to add a spoil board setup to receive dowel holes from the sketch points. When programming a thread milling operation in Fusion 360, there are two important numbers you need: the thread pitch and the pitch diameter offset. Learn how to create a Setup, select the machine type, operation type, machining plane, Work Coordinate System (WCS) and the define the stock boundary. Be sure and use tabs so the remaining stock is attached to the part. In your top setup do all your tool paths and then add a drill tool path at the sketch points. The easiest way is to create a sketch on the top surface of the part and create at least two sketch points where you will drill dowel holes in the stock (not the part).
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