Sweep to a helix spline - Solid Modeling

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Sweep to a helix spline - Any tips on how to make this work?

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MaiFy		#1 Posted : Friday, July 17, 2015 7:03:39 PM(UTC)
Rank: Senior Member Joined: 10/3/2014(UTC) Posts: 137 Thanks: 46 times Was thanked: 43 time(s) in 30 post(s)		Hi there I am a bit of a beginer to Cad drawing but I am trying to apply a one rail sweep solid to a helix spline that has been applied to a control point spline. I keep getting a message. The sweep results in a self-intersectng surface: I have tried various settings: Sweep Perp, Curve extents, OPTIONS, I have tried mitred bend and crimped. No Twist or Draft. I am using Shark FX Version: 8.0.3 Build: 1028 I would appreciate any tips or tricks to make this work Any help appreciated Thanking you Mark Edited by user Friday, July 17, 2015 7:06:32 PM(UTC) \| Reason: removed external image link File Attachment(s): Bar tapspiral2a.sfx (2,191kb) downloaded 13 time(s). MaiFy attached the following image(s): Bar tap.JPG (138kb) downloaded 44 time(s). You cannot view/download attachments. Try to login or register.


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rokoko		#2 Posted : Saturday, July 18, 2015 2:21:04 AM(UTC)
Rank: Senior Member Joined: 9/28/2013(UTC) Posts: 345 Thanks: 4 times Was thanked: 57 time(s) in 45 post(s)		hi, for "one rail sweep solid" you need to select a closed curve (a profile) first. the path is selected in second step. what was your profile? could you post a file or more pictures to understand
		viacad pro 10 powerpackpro, viacad pro 9 german, mac


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MaiFy		#3 Posted : Saturday, July 18, 2015 4:31:56 PM(UTC)
Rank: Senior Member Joined: 10/3/2014(UTC) Posts: 137 Thanks: 46 times Was thanked: 43 time(s) in 30 post(s)		Hi rokoko Thanks for taking a look. I have attached the file to the post above. I understand the process you described, I used that to sweep the goose neck. Its the spiral support spring that is not taking the sweep. Its the 3mm circle I am trying to apply. Thanks


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rokoko		#4 Posted : Sunday, July 19, 2015 4:36:35 AM(UTC)
Rank: Senior Member Joined: 9/28/2013(UTC) Posts: 345 Thanks: 4 times Was thanked: 57 time(s) in 45 post(s)		hi, i tried something, but could not manage this in viacad pro, even by using a new circle, snapped to endpoint of helix (using c-key to get correct workplane there). notice you can select some options in one rail sweep solid tool. e.g. "allow self intersections". try also to remove links from the helix and/or change object type before sweeping. seemingly there is bug. Edited by user Sunday, July 19, 2015 4:42:13 AM(UTC) \| Reason: Not specified
		viacad pro 10 powerpackpro, viacad pro 9 german, mac


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L. Banasky		#5 Posted : Sunday, July 19, 2015 10:38:46 AM(UTC)
Rank: Senior Member Joined: 2/16/2007(UTC) Posts: 602 Thanks: 153 times Was thanked: 149 time(s) in 102 post(s)		Hope this what you were looking for. Move the small circle by selecting center, to the endpoint of your helix, do a 1 rail sweep. See file or .jpg Larry Sorry can't upload the .sfx file, after the sweep, the file is too big to upload. Remove the .zip extension from the .sat, as .sat is not allowed to upload. Edited by user Sunday, July 19, 2015 10:53:12 AM(UTC) \| Reason: Not specified File Attachment(s): Bar tapspiral2a.sat.zip (1,369kb) downloaded 6 time(s). L. Banasky attached the following image(s): Helix.JPG (44kb) downloaded 14 time(s). You cannot view/download attachments. Try to login or register.

1 user thanked L. Banasky for this useful post.		MaiFy on 3/6/2016(UTC)
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MaiFy		#6 Posted : Sunday, July 19, 2015 9:37:37 PM(UTC)
Rank: Senior Member Joined: 10/3/2014(UTC) Posts: 137 Thanks: 46 times Was thanked: 43 time(s) in 30 post(s)		Hi rokoko and Larry. Thanks for looking into this. Larry, that worked for me as well. I thought I had gone through all the possibilities. I just retied that from the other end. It gives an error message when I used a larger diameter, (10 mm, which I started off with) but works with the 3mm diameter. Anyway, that's great, Thanks


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MaiFy		#7 Posted : Monday, July 20, 2015 6:52:00 AM(UTC)
Rank: Senior Member Joined: 10/3/2014(UTC) Posts: 137 Thanks: 46 times Was thanked: 43 time(s) in 30 post(s)		Okay I think I've got it. A self intersecting curve must be when the extruded shape blends into itself. So in this case the spiral diameter is 13mm anything over 6.5 mm will touch or blend into itself and keeping in mind the pitch too close together will also blend necessitating a smaller diameter. Just as a observation, Looking at the helix or spiral generated it looks like it isn't an evenly spaced pitch? and perhaps relates more to the control points rather than an evenly divided length. However for my situation, I am happy with the look of the thing so thanks for the help.


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rokoko		#8 Posted : Tuesday, July 21, 2015 8:15:52 AM(UTC)
Rank: Senior Member Joined: 9/28/2013(UTC) Posts: 345 Thanks: 4 times Was thanked: 57 time(s) in 45 post(s)		Originally Posted by: L. Banasky Move the small circle by selecting center, to the endpoint of your helix, do a 1 rail sweep. on a macbook pro (mac os 10.9.5) viacad pro (1163) crashes during that operation, unless i activate "allow self intersections".
		viacad pro 10 powerpackpro, viacad pro 9 german, mac


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