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hi guys, I need help, how can I make the spiral follow a path to make something like this : please help me

Hi, I'm trying to create a routine to draw trapezoidal threads in Adcad2000. I don't understand why it does not work. Can someone help me? I really appreciate, hugs. Code: ;Program that subtracts a 'cut entity' of a cylinder, shifts it along ;and turns it to make new cut, "N" times each "M" turns. ;Requirements: horizontal cylinder axle and load of "geom3d.arx" (Acad2000). (DEFUN C:LATHE (/) (Setq AUN (getvar "aunits")) (setvar "aunits" 0) (progn (setq Cylinder (entsel "\nClik the Cylinder to 'lathe': ")) (setq PtoA (GETPOINT "\nClick at START (center) of Cylinder: ")) (setq PtoB (GETPOINT "\nClick at END of Cylinder (center): ")) (setq CutEntity (entsel "\nSelect a 'CUT-ENTITY': ")) (princ "\nTotal Number of TURNS (spiral): ") (setq NTv (getint)) (setq Nv 1) (princ "\nHow many CUTS by TURN (resolution): ") (setq NCv (getint)) (setq Nc 1) (setq Step (/ (distance PtoA PtoB) (* NCv NTv))) (setq AngularStep (/ 360 NCv)) (setq PtoC (polar PtoA (angle PtoA PtoB) Step)) (while (>= NTv Nv) (while (>= NCv Nc) (command "copy" CutEntity "" "0,0,0" "0,0,0") (command "subtract" Cylinder "" CutEntity "") (command "move" Cylinder PtoC PtoA) (command "rotate3d" Cylinder PtoA PtoB AngularStep) (setq Nc (+ Nc 1)) ) (setq Nv (+ Nv 1)) (setq Nc 1) ) ) (setvar "aunits" AUN) )

Max Help only says that at bias 1 the turns are forced to one side, at -1 to the other side and at 0 all the turns are evenly distributed. I need to know on what formula or calculation the bias is based. Basically I’m building a 1 turn helix radius1=radius2=15 height=123. Move it to world origin. Switch viewport to front. The center of this helix changes as the bias changes. :?Yeah, but how? Based on what relation? If you set bias to 0.5 the center of our turn is at x=-15 y=0 z=120.28208 which is extremely close to the top. How is this calculated? I want the center of my turn set at z=92.25 which is at 75% of the entire helix height (half the distance between its center and top). According to this, bias should be set at 0.111111111. How is this determined? Is it a function of radius1 and 2, or of height? :unsure:My guess is that we are dealing with a ratio with an exponential factor based on its parameters. I want this formula. How is the bias affected if the two radii are different? My input values are segment AB and segment AC along with basic helix parameters. From these I want to determine/calculate the bias value. Expressed in other terms, how do I get from 0.75 to 0.11111 ? Can anybody tell what is under the hood of helix bias? Autodesk 3dsMax 2013 64-bit version 15 product update 6 Acer aspire V3-571G-53214G50Makk, Ivy Bridge Core i5-3210M @ 2.5GHz(turbo boost 3.1GHz), Nvidia GeForce GT 630M (2GB VRAM), 8 GB RAM DDR3 1333MHz, Win 7 Ultimate 64-bit

Hey, I'm pretty new to Autocad and I'm trying to draw one of those new energy-saving lightbulbs in 3D. It's a Phillips Mini Decorative Twister bulb to be exact. I'm trying to make it as accurate as possible. I have the base done and I did the spiral/middle part of the bulb, but I ran into a problem when I tried to do the bottom of the bulb where it meets the base. I used a spline since the bottom part of the bulb meets the spiral part at an odd angle, then curves at almost 90 degrees and goes straight to meet with the base. The problem is when I tried to sweep a circle along the spline Autocad wouldn't let me. If someone can help me with this or give me some tips on how best to do the bottom and top parts of the bulb, it would be much appreciated. Thanks.

Hello All, First post and novice AutoCAD LT 2009 user here, so please go easy! I've lurked for a while gratefully harvesting some handy hints, but this time after much searching I've realised I need to post my own plea for assistance. I'm creating drawings which show areas with heating in the floor. I hope that someone can point me at a shortcut/tool/addon which can save me some laborious polyline work in getting those heating pipes into rooms! I need to fill areas with lines at specific spacings, usually 200mm between lines. This can vary, but I'll keep it simple for now. The patterns which I need to fill the areas with are shown below (spiral and serpentine). Not a great problem for a regular room shape, but a pain if the rooms are irregular shapes, particularly when I'm doing the spiral layout. Being able to specify some additional criteria is also important, but for now I'm trying to keep my request to the bare minimum. This seems like the sort of thing there is probably a tool or addon for, but I haven't been able to find anything yet. Any help will be very gratefully received! Its driving me a bit nuts thinking I can't find a solution for something seemingly simple.