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Hello everybody, I have this problem with HELIX.They are not "radius perfect" when looking at them in a plan view.
In my drawing you will find the radius at elevation z=0 and the relative HELIX higher.
I have an example with complete turns and partial turns but even the complete one is unperfected.
Any help will be appreciated.

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philippe JOSEPH Members Profile Find Members Posts Senior Member Joined: 14.Mar.2011 Location: France Using: AutoCAD Mechanical 2017 Status: Offline Points: 1427	Topic: HELIX non perfect radius Posted: 24.Apr.2017 at 11:39
	uploads/175428/HELIX_01_A.dwg Hello everybody, I have this problem with HELIX. They are not "radius perfect" when looking at them in a plan view. In my drawing you will find the radius at elevation z=0 and the relative HELIX higher. I have an example with complete turns and partial turns but even the complete one is unperfected. Any help will be appreciated.

John Connor Members Profile Find Members Posts Senior Member Joined: 01.Feb.2011 Location: United States Using: AutoCAD 2018 Status: Offline Points: 7175	Posted: 24.Apr.2017 at 11:50
	Maybe your UCS is off kilter.
	"Humans have a strength that cannot be measured. This is John Connor. If you are reading this, you are the resistance." <<AutoCAD 2015>>

philippe JOSEPH Members Profile Find Members Posts Senior Member Joined: 14.Mar.2011 Location: France Using: AutoCAD Mechanical 2017 Status: Offline Points: 1427	Posted: 24.Apr.2017 at 12:58
	hello John, I'd like it to be but my UCS is set on world as you can see in the lists of my arc and helix : RAYON G1 COMMANDE: LISTE CHOIX DES OBJETS: 1 TROUVE(S) CHOIX DES OBJETS: ARC CALQUE: "CC_EIXOS" ESPACE: ESPACE OBJET COULEUR: DUCALQUE TYPE DE LIGNE: "DGN STYLE 4" MAINTIEN = 6B6BC69C CENTRE POINT, X=22422.722 Y=206223.074 Z= 0.000 RAYON 85.000 DEPART ANGLE 97.60 FIN ANGLE 212.38 LONGUEUR 170.277 ă€€ HELICE G1 COMMANDE: LISTE CHOIX DES OBJETS: 1 TROUVE(S) CHOIX DES OBJETS: HELIX CALQUE: "TEXTE" ESPACE: ESPACE OBJET MAINTIEN = 6B6BF8E0 POSITION: X = 22422.722, Y = 206223.074, Z = 163.668 LONGUEUR: 174.647 RAYON DE BASE: 85.000 RAYON SUPERIEUR: 85.000 TOURS: 0.319 DIST. PAS: 121.768 AXE: X = 0.000, Y = 0.000, Z = 1.000

John Connor Members Profile Find Members Posts Senior Member Joined: 01.Feb.2011 Location: United States Using: AutoCAD 2018 Status: Offline Points: 7175	Posted: 24.Apr.2017 at 14:04
	That's just the way it is. I wouldn't worry about it.
	"Humans have a strength that cannot be measured. This is John Connor. If you are reading this, you are the resistance." <<AutoCAD 2015>>

philippe JOSEPH Members Profile Find Members Posts Senior Member Joined: 14.Mar.2011 Location: France Using: AutoCAD Mechanical 2017 Status: Offline Points: 1427	Posted: 24.Apr.2017 at 15:23
	OK John but I worry a lot because I have to place in the millimetre penstock tubes dia. 5.2 m length approx. 6 m along that helix and that particular helix drawn with all the precision that I can ( 0.00000000 m with AutoCAD ) is out by 0.3 m at the maximum when compared with the original radius of 85 m and 62 m that we can see in a plan view. I think that I will have to elevate "by hand" points from the radius up to the slopes to create a 3dpolyline. Anyone around the planet can give a hand ???

John Connor Members Profile Find Members Posts Senior Member Joined: 01.Feb.2011 Location: United States Using: AutoCAD 2018 Status: Offline Points: 7175	Posted: 24.Apr.2017 at 16:58
	So after locating these points are you going to connect them with a spline? Have you tried constructing the helix in AutoDesk A360?
	"Humans have a strength that cannot be measured. This is John Connor. If you are reading this, you are the resistance." <<AutoCAD 2015>>

philippe JOSEPH Members Profile Find Members Posts Senior Member Joined: 14.Mar.2011 Location: France Using: AutoCAD Mechanical 2017 Status: Offline Points: 1427	Posted: 25.Apr.2017 at 07:22
	Hello John, I will eventually try and draw a "3D spline" if possible in 3D or I will draw a "3D polyline" that I known possible to do in 3D. For AutoDesk 360, I just don't known what it is. Eventually if someone could draw it and save it as .dwg........... The precision that I need is the millimeter ( the file unit is meter ) for the theoretical points at each "quadrant" of the pipes extremities for the workers on site job. The precision for the erection of it all ( apart the fact that the pipe are thin : thk 16 mm and thus more difficult to joint precisely ) is =/- 20 mm. N.B. I can see in the "related tips" here under that "helix" is also done in Inventor but I don't have it ( only AutoCAD Mechanical 2012 for both 2D and 3D), so......... Edited by philippe JOSEPH - 25.Apr.2017 at 07:28

scj.schulz Members Profile Find Members Posts Visit Members Homepage Groupie Joined: 27.Dec.2009 Location: Germany Status: Offline Points: 30	Posted: 27.Apr.2017 at 13:37
	Bonjour Philippe, I tried to recreate the HELIX-programm with adjustable accuracy. Perhaps it will solve your problem.. Regards Jochen >> (defun C:HELIX_scj (/ aunits_old osmode_old acc height radius delta_ang delta_h) ;; approximation by a 3D-SPLINE with adjustable accuracy (setq alpha 0.0 h 0.0) (setq acc 10000) (setq height 100.0) (setq radius 100.0) (setq AUNITS_old (getvar "AUNITS") OSMODE_old (getvar "OSMODE")) (setvar "AUNITS" 3) (setvar "OSMODE" 0) (setq delta_ang (/ (* 2 pi) acc) delta_h (/ height acc)) (command "_SPLINE") (repeat (+ 1 acc) (progn (command (strcat (rtos radius) "<" (rtos alpha) "," (rtos h))) (setq alpha (+ alpha delta_ang) h (+ h delta_h)) ) ) (command "") (command "") (command "") (setvar "AUNITS" aunits_old) (setvar "OSMODE" osmode_old) ) >>

philippe JOSEPH Members Profile Find Members Posts Senior Member Joined: 14.Mar.2011 Location: France Using: AutoCAD Mechanical 2017 Status: Offline Points: 1427	Posted: 28.Apr.2017 at 07:29
	Hallo Jochen, vielen Dank fĂĽr ihr Program, aber mein Deutsch ist nicht sehr gut. And also my abilities in doing program is also virtually inexistent. I will try to understand the way to create the HELIX with this program and contact you back. Maybe this will not be possible until the next week, maybe Donnerstag. Edited by philippe JOSEPH - 28.Apr.2017 at 07:33

scj.schulz Members Profile Find Members Posts Visit Members Homepage Groupie Joined: 27.Dec.2009 Location: Germany Status: Offline Points: 30	Posted: 28.Apr.2017 at 11:59
	Hi Philippe, you can contact me via www.black-cad.de Sorry - no French, but German, English or Russian ;-) Regards Jochen

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HELIX non perfect radius