Newbie Pocketing/ islands/ containment???


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Thread: Pocketing/ islands/ containment???

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    Default Pocketing/ islands/ containment???

    Hi All,
    I'm trying to learn the various forms of pocketing with MCX. On attached jpeg (2" diameter, I only care about top surfaces, not backside), I'm able to use the Standard Pocket routine for the 2 center bores (no problem). But.... what is the best way (or any way) to cut the surfaces outside the center post? I was going to use a combination of 1/8" flat and ball end mills.
    Issues-
    -I am trying to use Rough Pocket function, but... I cannot figure out the Containment feature. It does not seem to contain anything (wants to cut from center out, disregarding my island).
    -Is that because I can only select 2D geometry for containment? Why can't I select a surface e.g.; the center post?
    -Is it possible to have an inner and outer containment boundary?

    Advice is greatly appreciated. Thanks,
    Jeff

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    Community Moderator cadcam's Avatar
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    Sorry no picture.

    (Note: The opinions expressed in this post are my own and are not necessarily those of CNCzone and its management)
    Cadcam
    Software and hardware sales, contract Programming and Consultant , Cad-Cam Instructor .


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    Default Oh yes... the Jpeg



    Attached Thumbnails Attached Thumbnails Pocketing/ islands/ containment???-box3_bottom-jpg  


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    I would be doing this on a Lathe not a Mill.

    Face, Rough Turn, Index Drill, Rough Bore, Rough Tre-Pan, then the finishes. Hold the ID then do the other side of the part.

    Is this some kind of Button??

    If in case you don't have a lathe you might want to wait for cadcam's reply.

    Toby D.
    "Imagination and Memory are but one thing, but for divers considerations have divers names"
    Schwarzwald

    (Note: The opinions expressed in this post are my own and are not necessarily those of CNCzone and its management)

    www.refractotech.com


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    2 operations to rough the inner shape

    1- 2D contour ( ramp ) on inner bore with multi-passes on
    using the smallest bore size as the profile
    2- Rough Surface Pocket
    create a patch to cover the inner bore, and create curves on outermost lip on the part
    tool = bullnose to suit the part fillets
    drive surfaces = select this patch and all surfaces that would come into contact with the tool while pocketing
    drive offset = 0.01"
    check surfaces = none selected
    containment = outer-most profile on the lip- and keep tool inside



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    Quote Originally Posted by Superman View Post
    2 operations to rough the inner shape

    1- 2D contour ( ramp ) on inner bore with multi-passes on
    using the smallest bore size as the profile
    2- Rough Surface Pocket
    create a patch to cover the inner bore, and create curves on outermost lip on the part
    tool = bullnose to suit the part fillets
    drive surfaces = select this patch and all surfaces that would come into contact with the tool while pocketing
    drive offset = 0.01"
    check surfaces = none selected
    containment = outer-most profile on the lip- and keep tool inside
    Superman's reply will work too, LOL.

    Toby D.
    "Imagination and Memory are but one thing, but for divers considerations have divers names"
    Schwarzwald

    (Note: The opinions expressed in this post are my own and are not necessarily those of CNCzone and its management)

    www.refractotech.com


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    Default Mostly works.

    Thanks Superman,
    Your idea mostly works. But...
    -My designs are brought in from Pro-E. When I added geometry in MCX (patch as you call it), it was not selectable as a drive surface. (I modified my part in Pro-e to overcome). How do I change this?
    -I can't use a bullnose for ALL surfaces because lower counterbore has sharp edges. Do I always have to mask (patch) over areas I don't want my tool to go into, or is there an inside/outside containment strategy?

    And Tobyaxis-
    It sure is a lathe job! For those of us that have them. Eventually though, I think this piece will have non-rotationally symetric geometry, so mill will be the route.
    And... it's not a button. I'll tell you after I get a provisional patent filed (or after I determine it doesn't work )

    Thanks everyone,
    Jeff



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    Quote Originally Posted by slideleft View Post
    And... it's not a button. I'll tell you after I get a provisional patent filed (or after I determine it doesn't work )

    Thanks everyone,
    Jeff
    That sounds fair to me

    Toby D.
    "Imagination and Memory are but one thing, but for divers considerations have divers names"
    Schwarzwald

    (Note: The opinions expressed in this post are my own and are not necessarily those of CNCzone and its management)

    www.refractotech.com


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    Flies Fast Superman's Avatar
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    Are you working fron a solid or surfaces ?

    sometimes using surfaces you can have a little more control

    import your part as a solid
    then create surfaces
    <create> <surface> <create surfaces from solid> select the solid and accept

    patches
    <create> <surface> <fill holes with surfaces> select the surface that surounds the centre bore, and slide the arrow to the edge of the inner bore ( change colors first) and accept

    Bullnose will nearly always get material out quicker than a ballnose and will last longer



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    Community Moderator cadcam's Avatar
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    Jeff if you post the file I can put some paths on it.Is it Alum?

    (Note: The opinions expressed in this post are my own and are not necessarily those of CNCzone and its management)
    Cadcam
    Software and hardware sales, contract Programming and Consultant , Cad-Cam Instructor .


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    Thanks for the help Superman.
    What file format do you have best success bringing in as solid. I succeeded with .sat, but when I follow the create surfaces routine, I get surfaces, but they are apparently overlain on the solid as I get the psychadelic 2 color depiction of part.
    Problem #2- this happens to me often, and sometimes I get it to go away without knowing exactly what I did- when using surface rough pocket routine, I select drive surfaces, and the outer containment boundary (inside as you suggest), but when generating operation I get error message(s)- "No cut found-check tool, cut dpths, or use tool containment boundary". Followed by "unable to determine a valid machining zone- no tool path created". Followed by "error regenerating operation! surface rough pocket"

    Thanks again,
    Jeff



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    Community Moderator cadcam's Avatar
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    I wpould like to see the native Pro-e file as this what I would bring in and use the solid. most of the cuts are 2d except the convex surface area.

    (Note: The opinions expressed in this post are my own and are not necessarily those of CNCzone and its management)
    Cadcam
    Software and hardware sales, contract Programming and Consultant , Cad-Cam Instructor .


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Pocketing/ islands/ containment???

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