Here’s another cool feature in AutoCAD 2012. Both the FILLET & CHAMFER command show a preview of how the fillet or chamfer will look before you pick the second object and finish the command. This allows you to preview and make any changes prior to ending the command.
(picture below: Chamfer)
(picture below: Fillet)
AutoCAD Tips 
Really helped me study for my AutoCAD midterms thanks :)
Very happy to help
Very useful~Thanks a lot.
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can you give some notes on chamfer
Sure thing. Thanks for the suggestion. I might actually be able to start teaching AutoCAD at a local community college this fall. So making posts that clearly explain these basics of AutoCAD are really helpful.
enjoy
~Greg
https://autocadtips.wordpress.com/2012/06/02/intro-to-chamfer/
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I recently installed AutoCAD LT 2012…………..I often use the fillet command to join to lines, and with my old version of AutoCAD, if one was a polyline, the line that I am joining it to automatically took on the polylines thickness. With LT 2012, the ines will connect, but they will maintain their individual thickness. When I select the new line, the whole thing highlights, which tells me that it is now a connected polyline, but I have to set the width again, so that it has a continuous thickness. I would guess it is a setting, but………….can you help?
This is a very annoying issue that I wish that they would address as well.
If the lines are already touch the polyline at their end points instead of using FILLET, use the JOIN command.
But if the lines do not touch the end points of the polylines, use this LISP routine:
;;; MY-FILLET.LSP Fillet PolyLines;;; Fillets Any Type of Line (Line, PolyLine, LWPolyLine or Spline)
;;; by Ibro Vehabovic, March 1999.
;;; http://forums.autodesk.com/t5/Visual-LISP-AutoLISP-and-General/Join-then-fillet-polylines/td-p/.UNyL7-SLlyI
(defun c:my-fillet (/ getval spl2pl e1 e2 p2 l e ss)
;;; GETVAL - returns the group value of an entity.
;;; like the wellknown (dxf) function but accepts all kinds of
;;; entity representations (ename, entget list, entsel list)
(defun GETVAL (grp ele) ;"dxf value" of any ent...
(cond ((= (type ele) 'ENAME) ;ENAME
(cdr (assoc grp (entget ele)))
)
((not ele) nil) ;empty value
((not (listp ele)) nil) ;invalid ele
((= (type (car ele)) 'ENAME) ;entsel-list
(cdr (assoc grp (entget (car ele))))
)
(T (cdr (assoc grp ele)))
)
) ;entget-list
;;; "converts" SPLINE to PLINE
(defun spl2pl (ent / osm pdm deltaL pn pts e)
(setq osm (getvar "OSMODE"))
(setq pdm (getvar "PDMODE"))
(setvar "OSMODE" 0)
(setvar "PDMODE" 0)
(setq
deltaL (* (/ (GETVAR "viewsize") (CADR (GETVAR "screensize")))
(getvar "pickbox")
2.0
)
) ; max segment=2 * size of
pickbox
(if (= (getval 0 ent) "POLYLINE") ; heavy pline
(progn
(setq e ent)
(while (= (getval 0 (setq e (entnext e))) "VERTEX")
(setq pts (cons (getval 10 e) pts))
)
(setq pn (car pts)
pts (list (last pts))
)
)
(setq pts (list (getval 10 ent)) ; start pt
pn (getval 10 (reverse (entget ent)))
)
) ; end pt
(command ".POINT" pn)
(setq e (entlast))
(entdel e)
(command ".AREA" "_O" ent)
(command ".DIVIDE"
ent
(fix (/ (getvar "perimeter") deltaL))
)
(while (setq e (entnext e))
(setq pts (cons (getval 10 e) pts))
(entdel e)
)
(setq pts (reverse (cons pn pts)))
(apply 'command (append '(".PLINE") pts '("")))
(command ".CHANGE"
(entlast)
""
"_P"
"_LA"
(getval 8 ent)
""
)
(if (getval 62 ent)
(command ".CHANGE"
(entlast)
""
"_P"
"_C"
(getval 62 ent)
""
)
)
(entdel ent)
(setvar "PDMODE" pdm)
(setvar "OSMODE" osm)
(entlast)
thank you admn….
When I pick the first object and hover the cursor onto the second object, FILLET will not give the preview of the current setting. Please help.
The system variable “SELECTIONPREVIEW” might help.
Set the system variable to 3 and it should turn ON the preview of the selection.
Also check to see if there is a radius defined in the FILLET command. If it is set to zero, the preview will simply be a marker at the intersection and no arc or fillet to display.
The above picture shows the definition and notice that it shows the default value of 3. This will turn on the selection preview.
Absolutely spot on. Thank you so much for the suggestion. Work like a charm.
It’s not related to offset, trim and chamfer preview. Nothing to do with that! How can I disable this useless preview on offset (i.e. offset preview is often on the wrong side if you have osnap on and it’s very confusing and dangerous)
You bring up an interesting issue. The OFFSET command and its new “preview” functionality doesn’t seem to be affected when the system variable SELECTIONPREVIEW is turned off (set to zero).
I did run across s tip that might be helpful found here: http://www.cadtutor.net/forum/showthread.php?80125-Offset-preview&s=be09a1f14d9aef477c807cad3b74f1a9
Basically, they suggest using the REDEFINE command and redefining the OFFSET command to EXOFFSET which is the enhanced version of the OFFSET command. It works the same as the normal OFFSET command but gives you some more choices…
If you do go this route, make sure to also change your command alias to also point to the EXOFFSET command or else you will just launch the regular OFFSET command.
~Greg
sir how to chamfer command perfect measurement in auto cad page??
if you have use command how to perfect line etc 10′ example?