Designing with modifications in mind - Solid Modeling

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chromecat77		#1 Posted : Monday, February 19, 2018 4:04:57 AM(UTC)
Rank: Junior Member Joined: 4/18/2009(UTC) Posts: 16 Thanks: 3 times		Hello, I use ViaCAD Pro since version 6 but only occassionally, so I'm little more than a beginner. Right now I'm using v10. Recently I designed 3D printed parts for my hobby robots and as these things go, I often need to tweak the parts - moving, adding or deleting features, changing/tweaking dimensions to get something that is both printable and works in the real world. I usually start with 2d contours and apply 3D transformations (lofting, one-rail, two rail sweeps, etc.). I also try to design symmetric objects using mirrors. My problem is, when I try to change a model, the ACIS kernel usually fails to regenerate the features, and I cannot change the modeled part. I have to break it down to curve level, and rebuild the solid by applying the transformations again. I assume that this is because my design approach is somehow wrong. I'd like to ask you for tips or a guide regarding this topic, or just how you approach this problem. Thank you for any feedback.
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UGMENTALCASE		#2 Posted : Monday, February 19, 2018 5:56:18 AM(UTC)
Rank: Senior Member Joined: 3/21/2017(UTC) Posts: 952 Thanks: 46 times Was thanked: 319 time(s) in 212 post(s)		I too have difficulty, but I've found that suppressing updates can help, it will at least stop it trying to rebuild everything at once. Or I have had to, for example if I've created a shape of curves ( non are joined for other reasons)I've basically redrawn the shape, including the mod and used the replace curve function. Another option I've found. I was messing around with a pin. We do a lot of pins, and sometimes they need changing. If you have joined all the curves, if you use 'show points' you can manipulate each end of a curve. A nice little feature, but if you have something at a bizarre angle, or something other than planar, it becomes tricky as you are trying to move it in x, y & z positions.

1 user thanked UGMENTALCASE for this useful post.		chromecat77 on 2/20/2018(UTC)
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horst.w		#3 Posted : Tuesday, February 20, 2018 3:19:23 AM(UTC)
Rank: Senior Member Joined: 12/21/2014(UTC) Posts: 209 Thanks: 4 times Was thanked: 26 time(s) in 22 post(s)		Originally Posted by: chromecat77 ... My problem is, when I try to change a model, the ACIS kernel usually fails to regenerate the features, and I cannot change the modeled part.... ... I'd like to ask you for tips or a guide regarding this topic, or just how you approach this problem. ... I also draw my models only for 3D-printing and as we know, 3D-printing has an inaccuracy up to +/- 0.2 mm or more. The picture shows a always present problem: a bold doesn't match to a hole. Instead changing the construction (because the history is loosen when closing the program) I try to improve thickness using the Thicken-Command what is also working with negative values (reduction). Annoying blends you can delete before by using the Deep Select .. to be continue ... Regards horst.w GER Edited by user Tuesday, February 20, 2018 3:22:29 AM(UTC) \| Reason: Not specified horst.w attached the following image(s): Thicken.png (299kb) downloaded 10 time(s). You cannot view/download attachments. Try to login or register.
		ViaCAD 9 Pro german + ViaCAD 10 Pro & PowerPack + ViaCAD 11, Win7Prof 64 Bit upgraded to Win 10 64 Bit

1 user thanked horst.w for this useful post.		chromecat77 on 2/20/2018(UTC)
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UGMENTALCASE		#4 Posted : Tuesday, February 20, 2018 8:43:13 AM(UTC)
Rank: Senior Member Joined: 3/21/2017(UTC) Posts: 952 Thanks: 46 times Was thanked: 319 time(s) in 212 post(s)		I've just been experimenting with the N-Sided polygon. Really nice feature. This allows mods. With the shape you create, you basically get a list of control points, which you can edit, and then apply once edited. It does mean you need to think a little more about sizes on your part, but works really well.

1 user thanked UGMENTALCASE for this useful post.		chromecat77 on 2/21/2018(UTC)
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