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Hi @rkmcswain and all who have commented - thanks for your kind words. It has been a pleasure to keep this forum in good order over so many years (the CADTutor site is 25 years old this year!). Naturally, a forum isn't anything without its members, so I thank you all, in return, for being such a great community who continue to post brilliant content and .give your time freely to help others. Long may it continue!

Just a note to say thanks for maintaining this site. It's a pleasure to come here, read a question, type out a response and see it instantly appear to help the other user(s). Image attachments via drag+drop work flawlessly too. It is noticed and appreciated. Cheers!

I wasn't aware there were any others. I must get out more!

Also the best users, mods and admin!

In AutoCAD those are only display settings, the actual dxf contains an arc. It sounds like your CNC software is converting the arc to segments I would ask in the Forums for Mach3 if there is a setting that needs adjusting. It sounds like the software that is producing the g-code is causing the problem, is that Mach3 or do you have another piece of software in the middle of the process.

@jay@sitetechnologies.io I had a typo in my spreadsheet. Here it is corrected in your Excel file. A similar correction is required in H2 before you fill down. =C2+F2*(E2-C2)/SQRT((D2-B2)^2+(E2-C2)^2) You can copy and pasted the AutoCAD commands in column into the AutoCAD prompt llne to create the points. SolvingPointC.01.xlsx

If want an excel solution could use a ratio answer have pta 0,0 & ptb x,y so work out length pta to ptb then desired length/ total length. Something about an old guy pythagoras. Now (ratio * x2) (ratio * y2) then add to 0,0 thats the new point co-ordinates.

Here is a basic function and test command. I am using an association list in the form of (list (cons PtB L)(Cons PtB L)...). I leave you to figure out how to gather the points/Length list. ;; pllst = Association list of Points and Lengths. Example: '(((1.0 1.0) . 0.435)((2.0 2.0) 1.267)((3.0 3.0) 2.723)) (defun Get_Lpoint_List (pllst / rlst) (vl-load-com) (if (and (= (type pllst) 'LIST) (vl-consp (car pllst))) (foreach pt pllst (setq rlst (cons (polar '(0.0 0.0) (angle '(0.0 0.0) (car pt)) (cdr pt)) rlst)) ) ) (reverse rlst) ) (defun C:testthis (/ lst) (setq lst (list (cons (list 1.0 1.0) 0.435)(Cons (list 2.0 2.0) 1.267)(cons (list 3.0 3.0) 2.723))) (foreach n (Get_Lpoint_List lst) (command "._Point" "_non" n) ) )

Ditto !

I agree also great forum, the biggest out there is the worst site and they just dodge around the edges of the problems by saying contact our support request department

Like Lrm its very simple pick a line from 1 end that becomes ptA something I have been doing for years. ; simple make a point at dist on a line ; By AlanH march 2021 (defun c:testpt ( / tp1 tpp1 p1 p2 p3 d1 d2 temp ang ) (SETQ TP1 (entsel "\nSelect Line near left end: ")) ; implies which way (setq tpp1 (entget (car tp1)) p1 (cdr (assoc 10 tpp1)) ; start point p2 (cdr (assoc 11 tpp1)) ; end point p3 (cadr tp1) ) (setq d1 (distance p1 p3) d2 (distance p2 p3) ) ; swap point direction for end closest (if (> d1 d2) (progn (setq temp p1) (setq p1 p2) (setq p2 temp) ) ) (setq ang (angle p1 p2)) (setq d1 (getreal "\nEnter distance from end ")) (setq pt (polar p1 ang d1)) (setvar 'pdmode 33) ; turn on point style (command "point" pt) ; create a point (princ) ; exit quietly ) A couple more options are pt offset sq from point, and pt along a pline as already mentioned.

Since point A and B are connected by a line, you could just have "select line" and work out the points?