Hip tip: Joining corners by using FILLET

Murat has already explained about FILLET in his article. In this article, I will give you some additional useful tips that you can use together with this command.

Fig.1 There is an un-joined corner in the door drawing.

Sometimes, there can be un-joined corners or some corners that are overflowing through the lines that are connecting at that corner. There is a very easy way to correct them by using TRIM command. FILLET R=0.

In case of Fig. 1 or in overflowing corners case, enter FILLER command and make sure that Radius parameter is set to 0. Then, select the corners that will be corrected. Don’t forget that, for the surplus parts, you should select the sides which you would like them to remain.
Fig.2 After completion of editing

I hope this small tip is useful for you. Have a nice day.

FILLET command in 2D
This command combines drawings entities ( line, arc, polyline, circle etc. ) from the points that there is a possibility for these entities to connect and creates a corner. Entities that are used for FILLET can either be lengthened or shortened. When using the command, we should select the entities from their sides where we want them to remain on the screen. Their parts which are out of the selected side will be cut from their connection or intersection points.





We can use the command by using both Modify menu or by entering “F” from keyboard.
Fig. 1 Entities may lengthen or shorten during the connection.

If we enter “0” (zero) for the “Radius” value, then a dull connection is created. A dull connection is a connection where a sharp corner is formed. If you enter a value for “Radius” option in Fillet command, then an arc is used for the connection of entities. If you enter a radius value for the fillet command, then this value is kept and used as default for each time you run the command.
Fig. 2 If an arc will be used for connection, then a radius value must be entered.

If you are going to combine entities that were drawn by using POLYLINE command, then for using the same radius at the all of the corners, you can do this at once by using the POLYLINE option.
Fig. 3 you can get use of FILLET for a polyline that was drawn previously.

When FILLET command is used, drawings entities that are longer from the intersection point and that have a possibility to connect, then they are shortened. Similarly, they get lengthened if they are short. In order to use this feature, you can use TRIM option when you enter FILLET command. If you don’t want this feature, then you must use NO TRIM option. By this way, you can avoid losing original entities.
Fig.4 You can get use of TRIM option or not.

Next question is how FILLET works with parallel lines. Probably the most interesting surprise of FILLET command arises here. As you know, there is no possibility for the parallel lines to connect, i.e. it is assumed that they don’t intersect even at infinity. If you use FILLET command on parallel lines, then distance between these lines will be accepted as the radius and the two lines will be connected with an arc. No matter what the default Radius value is in the FILLET command, this does not change the result.
Fig .5 First line that is drawn is reference when Parallel lines are used.

Rectangle – Fillet (Rectangle, corners of which is rounded)

Fillet option inside Rectangle command makes the corners of rectangle rounded according to the radius value given. When rectangle command is entered, you can access to fillet sub-command by entering “F” keyword. After entering a valid radius value here, then you select the other corner of the rectangle. Then drawing of rectangle is completed.
Fig .6 Try drawing a rectangle once by this way.