HELP! Can't mill around a chain sprocket!


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Thread: HELP! Can't mill around a chain sprocket!

  1. #1

    Default HELP! Can't mill around a chain sprocket!

    HELP!!
    I imported a 12-tooth chain sprocket file from Mcmaster-Carr.
    The teeth are tapered at the edges, not flat to the face.
    When I go into CAM, and try to profile around the outside edge of the sprocket, it won't let me.
    It shows each tooth as it's own curve.
    GGRRRR.
    I tried to push-pull the face, but alarms popped up.
    Fusion is really frustrating!
    I just want to mill the outside profile of a damn chain sprocket!!!!!
    Any help, or knowledge about this? Please.
    UUGGHH!!

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  2. #2
    Member precisionmetal's Avatar
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    Default Re: HELP! Can't mill around a chain sprocket!

    How about just projecting the geometry you want (outside profile of the teeth, it sounds like?) onto a sketch plane, and then drive that CAM from that? (or re-extrude into a sprocket that has flat sides if you prefer to work off the solid).

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  3. #3

    Default Re: HELP! Can't mill around a chain sprocket!

    I ended up importing a 2D DXF drawing from my Pc, AFTER downloading it from McMaster-Carr.
    Sheesh!
    It would be nice if Fusion allowed 2D file uploads instead of just 3D STEP or SVG files..



  4. #4
    Member precisionmetal's Avatar
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    Default Re: HELP! Can't mill around a chain sprocket!

    I thought about it after my previous post: you may have been able to just place a plane mid-point in the sprocket, and split that solid in half. Then if you selected the profile edge that was created at the split line, Fusion should have had no trouble following that profile around... would have just been a matter of setting the Z height(s) to clear the top of your blank and cut past the bottom.

    I think either of the two ideas should have worked.

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  5. #5
    Member precisionmetal's Avatar
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    Default Re: HELP! Can't mill around a chain sprocket!

    Yep... just tried it. Grabbed a sprocket from McMaster, created a construction plane mid-point in the teeth, split the body, and hid everything except the one half.

    2D Contour strategy, and everything worked fine. Would just be a matter of fudging the Z offsets slightly to catch the full face width of your blank.

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    HELP! Can't mill around a chain sprocket!-1-jpg

    HELP! Can't mill around a chain sprocket!-2-jpg



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    Default Re: HELP! Can't mill around a chain sprocket!

    Quote Originally Posted by precisionmetal View Post
    Yep... just tried it. Grabbed a sprocket from McMaster, created a construction plane mid-point in the teeth, split the body, and hid everything except the one half.

    2D Contour strategy, and everything worked fine. Would just be a matter of fudging the Z offsets slightly to catch the full face width of your blank.

    PM

    HELP! Can't mill around a chain sprocket!-1-jpg

    HELP! Can't mill around a chain sprocket!-2-jpg
    Your second post is what I would have done. I would have made the plane on the bottom of the sprocket, and projected the outline to that plane. That way the Z height isn't an issue.

    I find myself using sketch geometry a lot with Fusion. Sometimes even more so than using the model geometry.



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HELP! Can't mill around a chain sprocket!

HELP! Can't mill around a chain sprocket!