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IndustryArena Forum > CAM Software > Autodesk CAM > Fusion 360 Cam seems to make me use smaller bits then I would think
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  1. #1
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    Aug 2016
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    Fusion 360 Cam seems to make me use smaller bits then I would think

    Ok I am doing a part and have generated the CAM but I am confused. I am milling a T shape. The long part of the T is .13 wide. so I figured a 1/8" endmill would work. Fusion fails to generate a toolpath. I get a big Yellow triangle but no reason why. If I go down to a 2.5MM endmill it will work. I have the tool plunging and not helix. I have messed around with the ramping and still no luck. So maybe some of you experts can explain to why? I was trying to mill a slot but using 2d Adaptive. The slot was .043 and I had to go to a 1/32 " endmil to get the path to generate. Then I tried the slot function and was able to go to .042 and get a toolpath. Just trying to understand this..

    Thanks

  2. #2
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    Mar 2013
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    Fusion 360 Cam seems to make me use smaller bits then I would think

    Are you using a lead-in and lead-out? Is the specified distance too long?
    How about material left for finish pass? If too much is left might cause problems

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  3. #3
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    Aug 2016
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    Re: Fusion 360 Cam seems to make me use smaller bits then I would think

    Quote Originally Posted by ripperj View Post
    Are you using a lead-in and lead-out? Is the specified distance too long?
    How about material left for finish pass? If too much is left might cause problems

    Sent from my iPhone using Tapatalk Pro
    I will check.. I know I have made materials to leave 0.
    So lead in lead out is what exactly. Trying to understand what the setting means.
    Thanks

    Sent from my XT1635-01 using Tapatalk

  4. #4
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    Mar 2013
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    Re: Fusion 360 Cam seems to make me use smaller bits then I would think

    Lead-in is a setting that makes a gradual “ramp” to the actual tool path. When the tool path is complete , lead-out is a gradual move away from the cut. There are horizontal and vertical check boxes. Lead-in/out helps with a better finish
    These settings are turned on/off with check boxes in the last tab in the CAM work space. There is a place to enter a distance for the lead-in(or out)




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  5. #5
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    Re: Fusion 360 Cam seems to make me use smaller bits then I would think

    Quote Originally Posted by ripperj View Post
    Lead-in is a setting that makes a gradual “ramp” to the actual tool path. When the tool path is complete , lead-out is a gradual move away from the cut. There are horizontal and vertical check boxes. Lead-in/out helps with a better finish
    These settings are turned on/off with check boxes in the last tab in the CAM work space. There is a place to enter a distance for the lead-in(or out)




    Sent from my iPhone using Tapatalk Pro
    So is that all they really do is help the finish? Right now if I get the part to cut I am thrilled..lol

    Sent from my XT1635-01 using Tapatalk

  6. #6
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    Mar 2013
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    Re: Fusion 360 Cam seems to make me use smaller bits then I would think

    The lead-in/out just keeps the endmill from leaving a vertical mark if you were to retract the cutter vertically from the finish pass, or plunge in from the beginning
    Can you post screen shots of your CAM set-up (all tabs)
    What’s the machine and material?


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  7. #7
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    Re: Fusion 360 Cam seems to make me use smaller bits then I would think

    Quote Originally Posted by ripperj View Post
    The lead-in/out just keeps the endmill from leaving a vertical mark if you were to retract the cutter vertically from the finish pass, or plunge in from the beginning
    Can you post screen shots of your CAM set-up (all tabs)
    What’s the machine and material?




    Sent from my iPhone using Tapatalk Pro

    I am using an X2 harbor freight mill that I converted to CNC. Using MACH3 and cutting 01 tool steel.
    Thanks

    The Slot in the T is what seems to make me use the smaller bit. If I go about 1/8" the CAM will not make a tool path in the slot.








  8. #8
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    Mar 2013
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    Fusion 360 Cam seems to make me use smaller bits then I would think

    I’m on my phone, so it’s hard to see, but your leadin looks like .009”?
    .125” endmill plus the .009” lead in is bigger than your slot .130”?? So I see why no valid tool path would generate., just uncheck both the lead-in and lead out boxes and see if a tool path generates.
    I would un-check the “stock to leave” box even though you have 0” in the box too.


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  9. #9
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    Re: Fusion 360 Cam seems to make me use smaller bits then I would think

    Quote Originally Posted by ripperj View Post
    I’m on my phone, so it’s hard to see, but your leadin looks like .009”?
    .125” endmill plus the .009” lead in is bigger than your slot .130”?? So I see why no valid tool path would generate., just uncheck both the lead-in and lead out boxes and see if a tool path generates.
    I would un-check the “stock to leave” box even though you have 0” in the box too.


    Sent from my iPhone using Tapatalk Pro
    So does the lead in get added to endmill side?

    Sent from my XT1635-01 using Tapatalk

  10. #10
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    Re: Fusion 360 Cam seems to make me use smaller bits then I would think

    I guess it depends on where your cut starts, if you start the cut in the narrow part, the .009” is a short travel path 90 degrees to the narrow wall.
    You should be able to hover your mouse over the lead-in box and a picture should pop up showing how it works


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  11. #11
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    Re: Fusion 360 Cam seems to make me use smaller bits then I would think

    Also check your endmill diameter and make sure you didn’t edit it to be bigger. You can have the name be 1/8” endmill, but edit the diameter to be bigger


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  12. #12
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    Re: Fusion 360 Cam seems to make me use smaller bits then I would think

    Quote Originally Posted by ripperj View Post
    Also check your endmill diameter and make sure you didn’t edit it to be bigger. You can have the name be 1/8” endmill, but edit the diameter to be bigger


    Sent from my iPhone using Tapatalk Pro

    Yes The toolpath seemed to work better when i took that out. So how do you guys use the lead in and out if you have to cut with smaller tools is that not an issue.
    Thanks BTW

  13. #13
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    Re: Fusion 360 Cam seems to make me use smaller bits then I would think

    Quote Originally Posted by ripperj View Post
    Also check your endmill diameter and make sure you didn’t edit it to be bigger. You can have the name be 1/8” endmill, but edit the diameter to be bigger


    Sent from my iPhone using Tapatalk Pro
    Ok Here working on another project trying to learn this stuff. I have defined a 3/8" endmill. I know this size will work as I have seen other CNC guys use 3/8" endmill.
    If I put 1/4" in it will generate the entire toolpath.

    If you have a min and see where my error is sure would help me out. Thanks

    If you look at the last pic which is the toolpath the cutter is not going into the end of the pocket. Not sure why?






  14. #14
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    Re: Fusion 360 Cam seems to make me use smaller bits then I would think

    I’m not seeing anything obvious, post a picture of the tool settings from the tool library. It’s the only thing I can think of. I’m pretty good with Fusion, but I taught myself, so there are probably some gaps in my knowledge


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  15. #15
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    Re: Fusion 360 Cam seems to make me use smaller bits then I would think

    Quote Originally Posted by ripperj View Post
    I’m not seeing anything obvious, post a picture of the tool settings from the tool library. It’s the only thing I can think of. I’m pretty good with Fusion, but I taught myself, so there are probably some gaps in my knowledge


    Sent from my iPhone using Tapatalk Pro
    Yea I am trying to teach myself this. I am wanting to do some gunsmithing and I really appreciate the help...

    Not that this is a big deal but do you know how to get a standard collet for holder in fusion?

    Attached Thumbnails Attached Thumbnails ar6.jpg  

  16. #16
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    Mar 2013
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    Re: Fusion 360 Cam seems to make me use smaller bits then I would think

    Don’t know dude

    I only thing I would try is turning optimum load in passes tab down, try small like .005

    I think in the tool library you can click on the holder tab and select different holders


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  17. #17
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    Re: Fusion 360 Cam seems to make me use smaller bits then I would think

    so
    Quote Originally Posted by ripperj View Post
    Don’t know dude

    I only thing I would try is turning optimum load in passes tab down, try small like .005

    I think in the tool library you can click on the holder tab and select different holders


    Sent from my iPhone using Tapatalk Pro
    So what does optmum load really do?

  18. #18
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    Re: Fusion 360 Cam seems to make me use smaller bits then I would think

    Not sure how it works, but it calculates cutter engagement during roughing adaptive tool paths to be most efficient


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  19. #19
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    Re: Fusion 360 Cam seems to make me use smaller bits then I would think

    I think im at the limits of my ability to help further


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  20. #20
    Join Date
    Oct 2010
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    171

    Re: Fusion 360 Cam seems to make me use smaller bits then I would think

    truckeic,

    I've made the exact same part (as you have shown above) with a 3/8" EM with zero issues.

    The only difference I can see is that you have zero lead in/out, and also I selected a predrill/entry point when I did it (I pre-drilled a hole specifically for that purpose).

    PM

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