Calculator of foreword geometry is a when AutoCAD R12 offers very useful tool. With common calculator, geometrical calculator can finish ＋ , - , * and / the operation of operation and trigonometric function. This makes the user is in process of use AutoCAD plot, jussive circumstance can be broken to fall to undertake arithmetic manipulation with the computer in bos, autoCAD regards jussive parameter as to use the result of operation directly. But important is, differ with general calculator, autoCAD geometry calculator can make geometrical operation. It can make coordinate between dot and coordinate dot add reduce operation, the OSNAP pattern that can use AutoCAD catchs the coordinate dot on screen to participate in operation, return coordinate of geometry of OK and automatic computation to nod. If calculate two to intersect linear node, dot of divide into equal parts of computational straight on-line. In addition, autoCAD geometry calculator still has the function of computational vector and normal. Of course, autoCAD geometry calculator still has the function of other, here is differ one enumerate. In use AutoCAD plot, often need to decide a few cannot give out directly the dot of coordinate. For example, random the midpoint between 2 o'clock; With the round the centre of a circle with aleatoric linear and tangent direction; And assume office point-blank dot of meaning divide into equal parts. This is the fixed position problem of the CAD plot that we say normally. Actually, in a lot of computer plot circumstances, whether fixed position goes to the lavatory and often affect constructive efficiency and rate accurately directly. Accordingly, should make full use of the geometrical operation function of AutoCAD geometry calculator, will realize the fast fixed position in AutoCAD plot. In command clew Command: The collect of supplementary food individual event that CAL or activation pull-down menu key in below among them individual event of geometrical computation dish can start AutoCAD geometry calculator. CAL command also is a transparent command, can start geometrical calculator at any time below the command of other. In addition, still can use CAL order in AutoLISP program. The example of a few when the geometrical operation function that uses AutoCAD geometry calculator comes true to often be encountered in AutoCAD plot fast fixed position is below. 1. Decide to the MID mode that preexistence draws OSNAP of reoccupy of an auxiliary line between two substance does not need to get midpoint here between two substance. For example, should be start to draw from a the centre of a circle and the center between one steep end points all the time line. Unit process of cargo bandling is as follows: Command: From Point of Line : Cal (starts geometrical calculator) >>Expression: (Cen+end)/2 (inputs expression, here calculator regards the Cen of OSNAP and End mode as a little bit of coordinate temporarily location) >>Selec Entity For CEN Snap:(Consumed mark catchs the centre of a circle) >>Selec Entity For END Snap:(Does consumed mark catch steep end points) To Point: ? Ling of which collate of ∑ Lu crouchs Nt of Zuo of Jiao J dumpling, Ins, Tan to all can be in etc geometry is used in computational expression. If use expression (Cur ＋ Cur)/2 replaces expression (Cen+end)/2, can be when dot of computer requirement input, again the dot that set OSNAP means will come to catch place to need. 2. The point of aleatoric divide into equal parts that decides one goes up point-blank and the Plt that use geometrical calculator to offer with the dot of fixed length of steep end points and Pld function can complete this operation. What there is one end points to be A and B on hypothesis screen is linear, should going up point-blank obtain paragraph of cent is linear AB to be 1 than the dot of 2. Still be in order to draw point-blank exemple, unit process of cargo bandling is as follows: Command: From Point of Line : > of Cal >Expression: Plt(end, end, > of 1/3) >Selec Entity For END Snap:(Consumed mark catchs > of of of end points A)>Selec Entity For END Snap:(The point that after consumed mark catchs end points B, gets the dot is 1/3 line end length is apart from A namely) To Point: ? Street of Mei of of ∪ Quan finishs Gu free time say Zuo is the dot of 5, use function Pld(end, end, 5) is replaced above the Plt(end in unit process of cargo bandling, end, 1/3) can. 3. Will decide the dot is in plot with opposite coordinate, often want to draw another line relative to a line, unit process of cargo bandling is below: Command: From Point of Line : > of Cal >Expression: End+[2, the addition operation that 3](makes dot and point) >>Selec Entity For END Snap:(After catching one fiducial and steep end points, can obtain be apart from end points opposite displacement (2, the dot of 3) ) To Point: ? The From cause that provides in UtoCAD R13 of Ting of Xiong of δ of ≌ Sun Yu catchs mode likeness. 4. Make and the circle with one tangent diagonal and the tangent that cross Yuanshangyi to nod a circle use AutoCAD orthogonality mode to be able to be drawn easily and perpendicular or horizontal tangent circle. Draw to need to decide the centre of a circle well and truly with the circle with tangent diagonal. Unit process of cargo bandling is as follows: Command: 3P/2P/TTR/<Center Point> of Circle : > of Cal >Expression: Cur+3*nee(cur states consumed mark is on screen collect is nodded, nee function uses calculation the normal of vector of two end points, the 3 radius that are a circle) >>Enter A Point:nEa(consumed mark is in go up point-blank catch the dot serves as circle and linear point of tangency) To >>Selec One Endpoint For NEE:(Consumed mark catchs a steep end points) >>Selec Another Endpoint For NEE:(Consumed mark catchs another end points that goes up point-blank) Diameter/<Radius><1. 6745> : 3(gives out this circle can be drawn after round radius) change cursor is caught linear the order of two end points can be in linear another side picture is round. Had assumed circle and the unit process of cargo bandling that one linear node makes round tangent are as follows: Command: From Point of Line : Int(catchs point of intersection) of of Of To Point: > of Cal >Expression: Int+3*nor(cen, > of Int) >Selec Entity For INT Snap:(Consumed mark catchs point of intersection) >>Selec Entity For CEN Snap:(Consumed mark catchs the centre of a circle) >>Selec Entity For INT Snap:(Does reoccupy cursor catch point of intersection to draw the tangent that is the foregone circle of 3 from nodical length setting out namely) To Point: ? ? . The cannot use AutoCAD so point-blank orthogonality pattern that because dispute level blame is perpendicular,the foregone point that passes a diagonal to go up makes the vertical line of diagonal draws straight vertical line. Use geometrical calculator to be able to be drawn directly with diagonal perpendicular and those who be affirmatory length is linear. Actually this is a problem of another end points that how fixes vertical line. Its unit process of cargo bandling is as follows: Command: From Point of Line : Mid(has set linear midpoint to make vertical line) of of Of To Point: > of Cal >Expression: The length that Mid+5*nee(5 is vertical line) >>Selec Entity For MID Snap:(With cursor choice diagonal catchs midpoint) >>Selec One Endpoint For NEE:(Consumed mark catchs steep end points) >>Selec Another Endpoint For NEE:(Does consumed mark catch another steep end points) To Point: ? Does of ⊥ seek Ling of Jue rainwatering in puddles to crouch a street to finish be favored with says astounded is bear Ying ministry a bit does Shi finish to fold of melon of of Ao of hesitating of a flat stone on iron rammer with ropes attached at the sides knocking at herd? CNC Milling