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How to draw a involute line under Acad 2000

How to draw a involute line under Acad 2000

How to draw a involute line under Acad 2000

(OP)
I don't know how to draw a involute under Acad 2000,anybody can give me some advice on this? many thanks

RE: How to draw a involute line under Acad 2000

There a simple example of drawing circle involute via LISP:

(defun c:involute(/ plist fi old_osnap cent rad xp yp eang)
  (setq plist (list "pline" 'command)
    fi 0.0
    old_osnap (getvar "osmode")    
    cent (getpoint "\nSpecify center of invotute: ")    
    rad (getdist cent "Specify circle radius of involute: ")
    )    
  (initget 0)
  (setq eang (getangle cent "Specify end angle <360>: "))
  (if (not eang) (setq eang (* pi 2.0)))
  (repeat 24
    (setq xp (+ (car cent) (* rad (+ (cos fi) (* fi (sin fi)))))
      yp (+ (cadr cent) (* rad (- (sin fi) (* fi (cos fi)))))
      plist (cons (list 'list xp yp) plist)
      fi (+ fi (/ eang 24.0))
      )
    )
  (setq plist (reverse (cons "" plist)))
  (setvar "osmode" 0)  
  (eval plist)   
  (setvar "osmode" old_osnap)
  (command "PEDIT" (entlast) "F" "")
  (princ)
  )

Regards.

RE: How to draw a involute line under Acad 2000

the true involute of a circle is the involute funtion as

inv (alfa) = tan (alfa) - alfa.

for alfa in radian and alfa is the pressure angle of the gear.

so for a given circle , you have as many involutes as alfa´s choosen.

I have a exel file to make a script file to load on acad and a LISP program to do the same .

Due a virus attack my pc is out of order until nex week . then I will be able to sen it if you want to.







Pardal

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