Machining path deviation

RoboTomo
Contributor

Machining path deviation

RoboTomo
Contributor
Contributor

Hello,

I have a problem creating straight machining paths in Fusion. I use the Steep and Shallow method for 5-axis lead and lean machining. The machining direction in the Y-axis is fixed, so it would be desirable that the software could create straight lines in this direction, but this is not the case.

 

1. We can already see visually that in some cases, in the curved area, the line in the middle of the workpiece is going left and right, but ok, this is not a big deal yet (Picture 1).

 

2. The problem arises when I export the machining path/points that Fusion generated and plot the results. Here, we can clearly see the path deviation since it creates a Zig-zag pattern in the middle of the workpiece (Picture 2). 

 

I calculate the optimal direction and minimal speed in this Y-direction. I now have to generate a machining path in this direction and verify the minimal speed, but this speed is always incorrect because it is caught in that Zig-zag Fusion pattern.

 

Why is Fusion doing that and how to eliminate it?

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seth.madore
Community Manager
Community Manager

Would you be able to share your Fusion file here?
File > Export > Save to local folder, return to thread and attach the .f3d/.f3z file in your reply.


Seth Madore
Customer Advocacy Manager - Manufacturing


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RoboTomo
Contributor
Contributor

Thank you for your answer. I am attaching the file.

So the goal is to obtain straight machining lines for different stepovers (2, 1, 0,5, 0.1 mm). In this example, we have a stepover of 2 mm and for this case, I tried changing tool diameter, tolerance, and smoothing but was unsuccessful.

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RoboTomo
Contributor
Contributor

I am still struggling with this problem and have additional question.


How exactly are toolpaths generated in this Steep and shallow strategy and if this is different for other strategies? Are they generated directly on the 3D surface with offset curves, or are they generated on the XY-plane and then projected onto the 3D surface?

Thanks.

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a.laasW8M6T
Mentor
Mentor

Hi

 

I have made a video that hopefully explains what is going on with the toolpath there

2024-08-02 18-14-55.mp4
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    RoboTomo
    Contributor
    Contributor

    Thank you very much for your answer; you provided a very good explanation! I have been trying all sorts of parameters and did additional tests after your video, and the results are better. However, in some cases, there are still very sharp declines, as in my original post (Figure 2) when we zoom in. 
    I noticed that if I use the tool diameter the same as stepover distance, the results also improve.
    As you mentioned, the part itself can have an impact on the machining path. Here, originally, I had the .stl part, but I converted it into a solid body in Fusion; maybe it will be better to do machining directly on the original .stl part with a more dense triangulation?

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    a.laasW8M6T
    Mentor
    Mentor

    Hi

     

    whether the original .stl will be better I am not sure, it will really depend on the quality of the original.

     

    The toolpath will re-mesh it when it calculates, but it can't Improve the quality better than the original.

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    RoboTomo
    Contributor
    Contributor

    Hi, it's me again. After more testing, unfortunately, I have to un-accept your answer @a.laasW8M6T.
    At the time, it seemed like it was working, but more detailed analysis showed there were still deviations. Please see the attached file, where the machining path from Fusion is compared to other software, where surface normals can deviate up to 8 degrees alongside the uneven toolpath in my original post.

     

    I am attaching another workpiece; please take a look if somebody can. I can't find the strategy or parameters to create straight machining toolpaths in Fusion 360 CAM software, and I think it's probably impossible.

     

    Conditions for machining path:

    - 5-axis machining with tool normal to the surface (Lead and lean option)

    - the strategy must offer arbitrary machining direction selection

     

    Currently, I am only able to create those paths with Steep and Shallow strategy but if there is another option that can create straight machining toolpaths under those conditions, I will gladly use it.


    I want to get confirmation on why that happens. Mainly, I want to eliminate if I am doing something in the design that results in bad toolpaths or if this is because of the underlying Fusion path planning algorithm.

     

     

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    a.laasW8M6T
    Mentor
    Mentor

    Hi

     

    As far as I'm aware Steep and shallow is the only toolpath that meets your criteria of Lead/lean and arbitrary direction.

     

    Looking at the PDF there is a significant surface normal error in Fusion compared to the other software.

     

    unfortunately I'm just a user of Fusion so I don't know what's going on "under the Hood" so to speak.

     

    @seth.madore this looks like something Craig might be interested in, may be worth running up the chain.

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    RoboTomo
    Contributor
    Contributor

    Ok thank you again for all your time and help. I hope somebody from Autodesk can take a look.

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    seth.madore
    Community Manager
    Community Manager

    I've raised this issue with a couple of people who would be able to speak with more authority on the matter, I'll let you know if/when I hear back from them!


    Seth Madore
    Customer Advocacy Manager - Manufacturing


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    craig.chester
    Autodesk
    Autodesk

    Here's an explanation as to what is happening with Steep and Shallow and some methods which might help you to get a superior result

     

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    craig.chester
    Autodesk
    Autodesk

    It might also be worth stating that both BLEND and FLOW both support Lead/Lean toolaxis control. However, they will not maintain a constant Y value or Parallel passes when viewing down Z.


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    RoboTomo
    Contributor
    Contributor

    Thank you very much for your time and help. I don't know how I didn't see this option before, but changing the smooth angle to 0 deg improved the machining for Workpiece 1 ("Fusion_example.f3d") along the 0.005 tolerance. The normal deviation has now improved (Fig. wp1_tolerance), but the downside is that there is a significant increase in points, but I can handle this. 

     

    Applying the same tactics to Workpiece 2 (Fusion_example_WP2 v4.f3d), which is also attached in previous posts, did not yield such good results. When the tolerance is low (0.005), the path drifts out from the surface, and additional turns at the end appear (Fig. wp2_low_tolerance_dev); those turns are still visible when changing the tolerance to 0.1 (Fig. wp2_tolerance_increase).

     

    Would you happen to have any suggestions for this workpiece? Based on the video, it seems that tool diameter can impact the machining since you can not pick a tool diameter smaller than the stepover distance in Fusion. Theoretically, if we set the tool diameter smaller, the contact point would be closer to the tooltip, and the path deviation may improve?

     

     

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    craig.chester
    Autodesk
    Autodesk
    Accepted solution

    I am unsure exactly why you want what you ask for....

    What may help you......

    You can cheat the system and use a CHAMFER TOOL with a very small tip diameter (I used a tip diameter = 0.1mm) and a much bigger diameter (I used 12mm for the diameter which enables me to use a stepover up to 12mm). This creates a Parallel Toolpath with Lead/Lean=0 very close to parallel. Fusion file attached. Let me know if this is useful to you.

     

    Chamfer_Tool.png

    Chamfer_Tool2.png



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    craig.chester
    Autodesk
    Autodesk

    Switching on CONTACT POINT BOUNDARY produces a toolpath with much cleaner end points.... Use this Document to check the result.

    Is this of use to you?

     

    1 Like

    craig.chester
    Autodesk
    Autodesk

    Almost_Parallel_Passes.png

     Toolpath is very close to parallel

    2 Likes

    RoboTomo
    Contributor
    Contributor

    Dear Craig,

     

    that's exactly what I was looking for; the paths are ideal now! Perfect!

    Thank you for taking the time to investigate that problem. You have saved me a lot of time because I was already looking at some other software, but I like the simplicity and versatility of Fusion and I am very glad I can continue using it.

     

    Yes, my demands for this machining are odd, and because all the strategies are based on milling, it was hard for me to achieve the right results. To simplify what we are doing: We are working on a robot hammer peening application, which is basically surface finishing, and there is no material removal like in the milling. Here, the hard metal ball is hammering the surface of the workpiece to improve hardness, smoothness, etc. (https://www.youtube.com/watch?v=E4zfizO65xo). We are calculating the optimal direction and robot machining speed to minimize the machining time, so the catch is that the calculated (designed) optimal directions are straight, and the robot should follow them very closely. Then we pick those optimal machining directions in Fusion, but if there are deviations from the designed directions, as initially, the machining task is not successful. That's why I need nice, smooth, and straight paths without deviations. If interested, I can send our paper, which better explains it.

     

    Thank you again. I would also like to thank @seth.madore to forward this problem to you and of course @a.laasW8M6T who is always willing to help and was also a big part in answering my other questions.

     

    Best regards.

     

    3 Likes

    craig.chester
    Autodesk
    Autodesk

    So happy that this looks like a workable solution for you 🙂  

    Is your robot hammer peening application aimed at hardening the outer layer of molds or press tools by any chance? If so, I know of a large customer who will probably be interested in your work.

    1 Like

    RoboTomo
    Contributor
    Contributor

    Yes, this is meant for the toolmaking industry, but we are still in the research phase. We can exchange some more data in private messages.

    Thanks.

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    We use Bing to deploy digital advertising on sites supported by Bing. Ads are based on both Bing data and behavioral data that we collect while you’re on our sites. The data we collect may include pages you’ve visited, trials you’ve initiated, videos you’ve played, purchases you’ve made, and your IP address or device ID. This information may be combined with data that Bing has collected from you. We use the data that we provide to Bing to better customize your digital advertising experience and present you with more relevant ads. Bing Privacy Policy
    G2Crowd
    We use G2Crowd to deploy digital advertising on sites supported by G2Crowd. Ads are based on both G2Crowd data and behavioral data that we collect while you’re on our sites. The data we collect may include pages you’ve visited, trials you’ve initiated, videos you’ve played, purchases you’ve made, and your IP address or device ID. This information may be combined with data that G2Crowd has collected from you. We use the data that we provide to G2Crowd to better customize your digital advertising experience and present you with more relevant ads. G2Crowd Privacy Policy
    NMPI Display
    We use NMPI Display to deploy digital advertising on sites supported by NMPI Display. Ads are based on both NMPI Display data and behavioral data that we collect while you’re on our sites. The data we collect may include pages you’ve visited, trials you’ve initiated, videos you’ve played, purchases you’ve made, and your IP address or device ID. This information may be combined with data that NMPI Display has collected from you. We use the data that we provide to NMPI Display to better customize your digital advertising experience and present you with more relevant ads. NMPI Display Privacy Policy
    VK
    We use VK to deploy digital advertising on sites supported by VK. Ads are based on both VK data and behavioral data that we collect while you’re on our sites. The data we collect may include pages you’ve visited, trials you’ve initiated, videos you’ve played, purchases you’ve made, and your IP address or device ID. This information may be combined with data that VK has collected from you. We use the data that we provide to VK to better customize your digital advertising experience and present you with more relevant ads. VK Privacy Policy
    Adobe Target
    We use Adobe Target to test new features on our sites and customize your experience of these features. To do this, we collect behavioral data while you’re on our sites. This data may include pages you’ve visited, trials you’ve initiated, videos you’ve played, purchases you’ve made, your IP address or device ID, your Autodesk ID, and others. You may experience a different version of our sites based on feature testing, or view personalized content based on your visitor attributes. Adobe Target Privacy Policy
    Google Analytics (Advertising)
    We use Google Analytics (Advertising) to deploy digital advertising on sites supported by Google Analytics (Advertising). Ads are based on both Google Analytics (Advertising) data and behavioral data that we collect while you’re on our sites. The data we collect may include pages you’ve visited, trials you’ve initiated, videos you’ve played, purchases you’ve made, and your IP address or device ID. This information may be combined with data that Google Analytics (Advertising) has collected from you. We use the data that we provide to Google Analytics (Advertising) to better customize your digital advertising experience and present you with more relevant ads. Google Analytics (Advertising) Privacy Policy
    Trendkite
    We use Trendkite to deploy digital advertising on sites supported by Trendkite. Ads are based on both Trendkite data and behavioral data that we collect while you’re on our sites. The data we collect may include pages you’ve visited, trials you’ve initiated, videos you’ve played, purchases you’ve made, and your IP address or device ID. This information may be combined with data that Trendkite has collected from you. We use the data that we provide to Trendkite to better customize your digital advertising experience and present you with more relevant ads. Trendkite Privacy Policy
    Hotjar
    We use Hotjar to deploy digital advertising on sites supported by Hotjar. Ads are based on both Hotjar data and behavioral data that we collect while you’re on our sites. The data we collect may include pages you’ve visited, trials you’ve initiated, videos you’ve played, purchases you’ve made, and your IP address or device ID. This information may be combined with data that Hotjar has collected from you. We use the data that we provide to Hotjar to better customize your digital advertising experience and present you with more relevant ads. Hotjar Privacy Policy
    6 Sense
    We use 6 Sense to deploy digital advertising on sites supported by 6 Sense. Ads are based on both 6 Sense data and behavioral data that we collect while you’re on our sites. The data we collect may include pages you’ve visited, trials you’ve initiated, videos you’ve played, purchases you’ve made, and your IP address or device ID. This information may be combined with data that 6 Sense has collected from you. We use the data that we provide to 6 Sense to better customize your digital advertising experience and present you with more relevant ads. 6 Sense Privacy Policy
    Terminus
    We use Terminus to deploy digital advertising on sites supported by Terminus. Ads are based on both Terminus data and behavioral data that we collect while you’re on our sites. The data we collect may include pages you’ve visited, trials you’ve initiated, videos you’ve played, purchases you’ve made, and your IP address or device ID. This information may be combined with data that Terminus has collected from you. We use the data that we provide to Terminus to better customize your digital advertising experience and present you with more relevant ads. Terminus Privacy Policy
    StackAdapt
    We use StackAdapt to deploy digital advertising on sites supported by StackAdapt. Ads are based on both StackAdapt data and behavioral data that we collect while you’re on our sites. The data we collect may include pages you’ve visited, trials you’ve initiated, videos you’ve played, purchases you’ve made, and your IP address or device ID. This information may be combined with data that StackAdapt has collected from you. We use the data that we provide to StackAdapt to better customize your digital advertising experience and present you with more relevant ads. StackAdapt Privacy Policy
    The Trade Desk
    We use The Trade Desk to deploy digital advertising on sites supported by The Trade Desk. Ads are based on both The Trade Desk data and behavioral data that we collect while you’re on our sites. The data we collect may include pages you’ve visited, trials you’ve initiated, videos you’ve played, purchases you’ve made, and your IP address or device ID. This information may be combined with data that The Trade Desk has collected from you. We use the data that we provide to The Trade Desk to better customize your digital advertising experience and present you with more relevant ads. The Trade Desk Privacy Policy
    RollWorks
    We use RollWorks to deploy digital advertising on sites supported by RollWorks. Ads are based on both RollWorks data and behavioral data that we collect while you’re on our sites. The data we collect may include pages you’ve visited, trials you’ve initiated, videos you’ve played, purchases you’ve made, and your IP address or device ID. This information may be combined with data that RollWorks has collected from you. We use the data that we provide to RollWorks to better customize your digital advertising experience and present you with more relevant ads. RollWorks Privacy Policy

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    Your experience. Your choice.

    We care about your privacy. The data we collect helps us understand how you use our products, what information you might be interested in, and what we can improve to make your engagement with Autodesk more rewarding.

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    Explore the benefits of a customized experience by managing your privacy settings for this site or visit our Privacy Statement to learn more about your options.