I’ve followed @DaveR ’s video for drawing screw threads, working at 1000x full scale. [image] Live Model Along! Assembly... with screws! Happenings [Screenshot - 4_15_2020 , 2_33_53 PM] [Screw Thread Tut] I’m using a somewhat unusual thread - one used since…

[image] john_mcclenahan: But Upright Extruder couldn’t get the first two segments to line up, creating a surface border issue between first and second turn. I get that same thing both at the start and at the end. I expect that to happen there and haven’t agonized why it happens. I just plan a…

If you want me to, I’ll look at it as soon as I get a chance and see what I can do for you.

Thank you, @DaveR . Busy at the moment for a couple of hours.

I’ll just see if I can model it based on the info you’ve given. I was figuring you were all set after mihai.s’s tuition.

Well, I have given up trying to draw this thread with rounded edges. I simply can’t get it to draw as a solid. That means I can’t bevel the top using Eneroth Solid Tools, and Intersect faces is too tedious to trim. I’ve PM’d @DaveR who may have time to try to find out why it doesn’t work. But I HAV…

First try but I don’t think it’s exactly right. This is 6 tpi. I may have misinterpreted your drawing earlier . You indicated the diameter as 5/16 in. but based on the other dimensions and the way you indicated it, I assumed it should be 5/8 in. diameter instead. I expect it’s way more detailed than…

@DaveR , thank you so much. You are right, the nominal diameter should be 5/8" but the thread stops slightly short by (at normal size) 0.0166" in radius, and my 5/16" (0.3125") was for the radius. So the actual radius of the outside of the thread is (at 1000x scale) 312.5 - 16.6, or 295.9. I still…

Thank you again - I thought it was something I was doing wrong. That’s reassuring.

So, it’s not just me… Parallel viewing of the basic helices helps show the distortion that unfailingly occurs when attempting to splice two “strands” together. As seen here, the junction seems shifted slightly to the left, breaking the usually straight line one would have expected. [Screen Shot …

What I see in your side view of the threads indicates that angles on the top and bottom of the thread are different. When I model threads the angles are the same and there’s no problem stacking sections to make a longer screw. Here’s an example of that with perfect alignment of two sections. [Sc…

So how do I avoid the problem? In other words, what should I do differently? The method I use is as follows: Form a helix and a cylinder of the same dimensions, alt-rotate the helix and scale it down in the x and y axes. That a distortion occurs at both ends of the result is unexpected and puzzling…

Drawing a screw thread - problem getting top and bottom faces

SketchUp

DaveR February 26, 2021, 10:24pm 27

Really? You don’t see the video tutorial in my post there?

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Drawing a screw thread - problem getting top and bottom faces

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