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  1. #1
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    Unhappy mitering 3D solids

    I am trying to make a 3D model drawing of a trophy stand that is rectangular & tapers as it goes up (pyramid), going from 44"x 24" at base to 38 1/2" x 12" at top and is 10 3/4" tall. The thickness of the parts are 3/4".
    witch in trun means that the pitch (tapper angle) of the side is diffrent from the ends.
    They don't make it easy for us do they! Can't us simple taper box angle chart!

    I can make the individual rectangular side & end parts, then rotate them into position at the angles I need, but I can't get them to cut at the intersection and make a miter joint.
    I need this so I can move the parts in a exploded representation and dimension the part with cut angles (both part dimension & edge pitch angle).

    I remember doing this in 3D class ( I thought) but to long ago to remember where to find command. Intersect & subtract doesn't work for this.

    I am using Acad 2006 full version. is this possible or do I need molding.

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    Default Re: mitering 3D solids

    I'd try end-view + side-view and Intersect then shell the solid to create the thickness.
    You'd get the cutting planes from the final geometry.

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    Default Re: mitering 3D solids

    John,
    Pardon my ignorance but it’s been so long ago that I have worked in 3D that I am lost.
    Tried to search help for END-VIEW & SIDE-VIEW no help.

    There is a way to setup view ports in paper space to section parts?
    For slice & section commands, but I never work with this and I am totally lost.

    Would you direct me to finding info on what you are explaining to me?

    Thanks for your reply
    Jeff

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    Default Re: mitering 3D solids

    Hi Jeff.
    "side-view" and "end-view" were just plain english not autocad-ese - "front elevation" and "side elevation" if you prefer.
    You said that intersect wouldn't give what you want but I think that this way it will.

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    Default Re: mitering 3D solids

    I've just tried it and the Shell operation fails, so does face offset.
    I'll get back to you.

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    Default Re: mitering 3D solids

    I think this is close -
    Last edited by jaberwok; 2009-09-27 at 03:20 PM.

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    Default Re: mitering 3D solids

    Easy enough to miter with slice. Here's what I did.

    After rotating your sides into position and flattening off the tops (Slice001) align your UCS with the 3 point option selecting as the origin the lower corner of the two plates, then the upper corner of the two plates, and finally using point filters select the X value of the inside of one plate and the YZ of the other plate. Construct a circle now (Slice002). I do that to help in visualization

    Now slice each plate selecting the "object" option then the "both" option - I use the both side option to again help visualize, and delete the not needed side. (Slice003)

    You can see the properly mitered result in Slice004 & 005
    Attached Images Attached Images

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    Default Re: mitering 3D solids

    Since adjacent walls are the same thickness it's not necessary to create a special UCS. A top view (normally WCS) allows you to slice two faces at each corner. Draw a polyline line from each "inner" end to form an intersection where inner corner should be. Use that intersection and the outer corner (or just the outer corner and a point on a line at 45 degrees) to define the slice.
    Now, if the walls were all different thicknesses ...

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    Default Re: mitering 3D solids

    I’m getting a different shape from the OP dimensions (or I’m reading them differently). With these dimensions a “shell” command works well.

    And, if this drawing is correct, the shop would have to 1.) Set the table saw at 41.53 degrees and 2.) Pull out the extra large sled.
    Attached Files Attached Files

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    Default Re: mitering 3D solids

    Quote Originally Posted by jaberwok View Post
    Since adjacent walls are the same thickness it's not necessary to create a special UCS. A top view (normally WCS) allows you to slice two faces at each corner. Draw a polyline line from each "inner" end to form an intersection where inner corner should be. Use that intersection and the outer corner (or just the outer corner and a point on a line at 45 degrees) to define the slice.
    Now, if the walls were all different thicknesses ...
    I would agree with you except for the fact the base dimensions and top dimensions contain different aspect ratios, resulting in differing slope of the front and side panels. My only reason for creating the special UCS (and slicing object) was to facilitate the point picking.

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