CAD画齿轮的渐开线程序 (lsp)和渐开线齿轮关系.doc

一、CAD中齿轮画法 有下面一段渐开线程序：;;;begain suprgear.lsp ;************************************************* ;SPURGEAR.LSP - a lisp program by Tony Hotchkiss ;------------------------------------------------- ; This routine draws a spur gear using joined ; polylines. It lets you use any pressure angle ; to design the gear teeth. ;************************************************* (defun err (s) (if (= s Function cancelled) (princ \nSPURGEAR - cancelled: ) (progn (princ \nSPURGEAR - Error: ) (princ s) (terpri)) ); if (resetting) (princ SYSTEM VARIABLES have been reset\n) (princ) ); err (defun setv (systvar newval) (setq x (read (strcat systvar 1))) (set x (getvar systvar)) (setvar systvar newval) ); setv (defun setting () (setq oerr *error*) (setq *error* err) (setv CMDECHO 0) (setv BLIPMODE 0) ); end of setting (defun rsetv (systvar) (setq x (read (strcat systvar 1))) (setvar systvar (eval x)) ); restv (defun resetting () (rsetv CMDECHO) (rsetv BLIPMODE) (setq *error* oerr) ); end of resetting (defun dxf (code ename) (cdr (assoc code (entget ename))) ); dxf (defun spurgear (/ D N phi DO RO A B DR DB inv-plst p1 trimcode invent p0 p curvent linent linent2 ent2 p2) (setq D (getreal \nPitch diameter: ) N (getint \nNumber of teeth: ) phi (getreal \nPressure angle: ) phi (* (/ phi 180) pi) ; Pressure angle DO (* D (+ (/ 2.0 N) 1.0)); Outside diameter RO (/ DO 2.0) ; Outside radius A (/ D N) ; Addendum B (* 1.25 A) ; Dedendum DR (- D (* B 2.0)) ; Root diameter DB (* D (cos phi)) ; Base circle dia. inv-plst (involute DB N phi);involute points trimcode nil ); setq (command ZOOM (list 0 (- B)) (list RO (/ RO 1.5)) ); command (setq invent (draw-inv inv-plst)); Draw involute. (setq p0 (car inv-plst) trimcode (ext-trim p0 DR D);trim or extend ); setq ; the involute. (if (and trimcode (= trimcode 0)) (progn ; Joins the involute to the extension. (setq p (list (/ DR 2.0) 0)) (command PEDIT p Y J invent X) (setq curvent (e