topic Re: Rectangle chamfer in AutoCAD Forum

Rectangle chamfer

Anonymous — Fri, 28 Apr 2017 13:25:10 GMT

Big problem that exist in autocad is rectangle chamfer.

when use same numbers for rectangle chamfer the object is usual

but if use diffrent numbers for rectangle chamfer the object turn to unusaul.

the unusual rectangle is not symmetry . autocad need to add tool or repair for turning it symmetry rectangle.

Please watch picture that attached

Re: Rectangle chamfer

imadHabash — Fri, 28 Apr 2017 13:17:07 GMT

Salam,

>> but if use diffrent numbers for rectangle chamfer the object turn to unusaul. <<

How.. give us more details.your issue still not clear.

Regards,

Re: Rectangle chamfer

Alfred.NESWADBA — Fri, 28 Apr 2017 13:20:58 GMT

Hi,

>> autocad need to add tool or repair for turning it symmetry rectangle

Even if you use a command _RECTANGLE to create a polyline, AutoCAD does never check for symmetrical or not polylines in later functions.

You do have the choice not to use the polyline-option within the command _CHAMFER, you can specify for each single corner which edge is for distance1 and which (other) edge is for distance2.

- alfred -

Re: Rectangle chamfer

Anonymous — Fri, 28 Apr 2017 13:27:01 GMT

thanks

Re: Rectangle chamfer

Anonymous — Fri, 28 Apr 2017 13:46:00 GMT

علیکم السلام

you know when use rectangle chamfer

autocad apply two numbers but first number is not just for (X) axis or second axis (Y) . if you attend to other aspect of rectangle , it is not symmetry in two aspect.

Re: Rectangle chamfer

ВeekeeCZ — Fri, 28 Apr 2017 14:09:41 GMT

Something like this?

http://autode.sk/2oSYKA3

Re: Rectangle chamfer

Kent1Cooper — Fri, 28 Apr 2017 15:37:09 GMT

@ВeekeeCZ wrote:
Something like this?

That's the result they don't want [see their posted images.] I think they are looking for a result like this:

in which [using your posting's Chamfer distances of 3 and 10] the 3 is always taken off the corner in the Y direction, and the 10 in the X direction. I did that in my image by not using the Polyline option in CHAMFER or the Chamfer option in RECTANGLE, but rather drawing an ordinary rectangle and picking the sides at each corner in the direction I wanted, as @Alfred.NESWADBA suggested in Post 3.

The problem with wanting the CHAMFER command to do it that way is that its Polyline option is not [and should not be] limited to rectangles, or to four-sided Polylines. If they were to "fix" the Chamfer command itself, what should it do with a three-sided or a five-sided or a twenty-sided Polyline? Or one that is not symmetrical at all? Should there be a specifically-Rectangle option, separate from the generic Polyline option? Etc.

It would require something like an AutoLisp routine, which wouldn't be too difficult, but raises some questions:

Presumably it would ask the User for not a "first" Chamfer distance and a "second" one, but in the sample-image situation, an X-direction and a Y-direction distance. But that would be appropriate only for orthogonally-oriented rectangles. What should it do on a rectangle that's at 45 degrees? Should it ask for a "first" distance to be in the direction that the Polyline heads from its startpoint to its second vertex, and a "second" distance the other way, and be restircted to rectangles only, or maybe just to even-number-sided Polylines, and alternate the direction of Chamfer at each corner?

Or should it not be restricted to even numbers of sides, and just accept that the last corner on an odd-sides Polyline will be Chamfered the same was as the first one?

[EDIT: Sorry, that upper-left side is Symmetrical, it's just the left-side one that isn't -- I'm not re-doing the image.] I imagine other questions would arise if one got into trying to develop something.

The RECTANGLE command's Chamfer option simply applies what regular Chamfer does to a rectangle in the process of drawing it. It shouldn't be too difficult to come up with a variant Rectangle command, to make a chamfered one symmetrical, but at least one of the same questions arises -- should the User have the option of X or Y direction for each Chamfer distance, or should it always [when those distances are different] apply Chamfer's own first distance in one of those directions and its second in the other, or should there be some other way of specifying? Because there are two possible symmetrical chamferings of the same-size rectangle using the same chamfer distances:

Re: Rectangle chamfer

dieters — Fri, 28 Apr 2017 15:29:13 GMT

mahdi.313.k2,

You are correct that AutoCAD doesn't recognize the horizontal and vertical symmetry with the Polyline option. AutoCAD only sees is a series of segments in a polyline and blindly applies the first and second distances to each vertex in succession.

The solution is either to chamfer each corner individually (the chamfer distances are retained), or, if you perform this operation frequently, write a LISP routine as Kent suggests that reverses CHAMFERA and CHAMFERB at successive vertexes (when the number of vertexes is even).

Best wishes,

Dieter