Second, here are time-stamps for the video for each section we're gonna cover: 0:37 Types of cuts 1:08 Process overview 2:00 CAM 2:29 CAM - setup 2:41 CAM - setup - stock tab (material) 3:14 CAM - setup - setup tab (orientation and zero) 4:07 CAM - tools 4:11 CAM - tools - cloud libraries 4:21 CAM - tools - add new tool 4:38 CAM - tools - speeds and feeds 5:21 CAM - toolpaths 5:39 CAM - toolpaths - passes we use 6:28 CAM - toolpaths - customize toolpath 6:36 CAM - toolpaths - customize toolpath - tool tab 6:43 CAM - toolpaths - customize toolpath - geometry tab 7:35 CAM - toolpaths - customize toolpath - heights tab 7:42 CAM - toolpaths - customize toolpath - passes tab 8:31 CAM - toolpaths - customize toolpath - linking tab 8:51 G-code 9:42 Machine Controller 9:58 Carve! First, a link to the Fusion 360 3D file we're using so you can follow along/poke around: So we've put together this beginners guide to using Fusion 360 CAM for your CNC.īefore we dive in, here are a couple things to help you follow along. If you haven’t tried out Fusion 360 yet, you can download a free trial at this link.Fusion 360 is an awesome tool you can use with your CNC because you can do fancy cuts like 3D curves, slopes, and complex layers. I hope this post helped highlighting the most important aspects to consider when machining internal corners on your components. Now that my minimum radius is 6 mm, based on what I said before, I could use a tool with a maximum diameter of 10 mm, if I wanted to, as my tool radius would be around 83% of the radii to machine. All I need to do is go to the Design worskpace, select the surfaces, then open the Press/Pull tool and select the desired value for the radii. Let’s say I want to modify the 5 mm radii highlighted in red in the image above, as they were the smallest I found. How to change your radii based on the available toolsĪnother option you have (unless the design specifications don’t allow you to) is to modify the radii to accommodate for the tools you have available. Therefore, I know that I can use a tool with a maximum diameter of 8 mm, as I’d be exactly on the 80% mark I mentioned above, if I don’t want any issues. What I always do first is run a quick Minimum Radius Analysis within the Manufacture workspace.įor the part you see in the image, I found the sweet spot at 5 mm, as you can see in the image below. Let’s now see together how we can be sure to choose the correct tools to machine the internal corners on the part we are about to program. How to find the minimum radius on your part As a rule of thumb, I would recommend a tool radius that’s 80% of the minimum concave radius you have to machine. Overall, the last scenario I depicted is the most desirable and effective one. Keeping in mind that we will still experience an increase in the engagement angle, a slight reduction in the feed rate would cope with the problems caused by the increasing cutting forces, leaving a better surface finish and decreasing the chances of a tool break. The third option we have is to use a smaller tool. In our second scenario, using a tool radius that matches exactly the part radius wouldn’t leave any undesired material, but would cause a sharp increase in the engagement angle, which could damage our tool, as I mentioned earlier. First, for example, using an 8 mm ball nose tool to machine a surface with a 3 mm radius would inevitably end up leaving material on the part, which in turn would result in the need for additional toolpaths to complete the programme, as you can see in the image below. Let’s now look at three possible scenarios. How to choose the correct tool to machine internal corners When a tool enters a corner, its engagement angle with the material will inevitably grow, subsequently increasing the forces acting on the cutter and resulting in a potential tool break or bad surface finish due to tool deflection. The risks here, if I chose the wrong tool, would be to gouge the part, leave some unmachined material behind, or even break the tool, all undesirable outcomes in the world of manufacturing. As we can see, there is quite a lot of concave radii on this Setup. Let’s take, as an example, the part you can see in the image below. In this post I will explain why analysing the internal radii on your model is very important when programming your toolpaths. Many things in the world of CAM can be tricky, but one aspect programmers should never neglect, if they want their tools to last, is how they plan to machine internal corners.
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