Fusion 360 Cut Sweep Custom Threads. Fusion Friday #19 

the necessity for a hack workflow just to be able to design a custom thread profile is straight up fail on Autodesk's record in my opinion

I actually figured this one out making a worm gear a few months ago. Start with the triangle spiral as you did but don't cut it yet. Sketch the desired profile on the end or beginning face. When you sweep use point for the path (as you did) but choose one of the outer triangle edges as a guide rail.

When sweeping, use the "path + guide surface", the path is the triangle spiral line, and the guide surface is the cylinder. Do this and it won't twist in weird ways.

Please change the title of the video to how not to make threads in fusion 360.

Maybe a better hack : Create the coil with a rectangular profile (0.2mm side), then use one edge of the created rectangular spiral for path and the other one for guide.

Using two 2d coils (using this method to create the coils) with different diameters but same heights and pitch, with one as the sweep path and one as the guide rail solves this problem!

@Sultan Arziev, Something is screwed up with the comments. I received your comment via an email from youtube but I don't see it here. I copied it below. Thanks for the video. Same thing I had mentioned but simpler because you don't have to project 3D geometry. " +Goldenstein Engineering and Fabrication LLC I wonder my comment is not appearing, so I made movie about the tip: goo.gl/iccmzo "

I want to make threads on rectangular body. How can I make it in Fusion360?

I find in my version of Fusion, if I pick the path at the bottom (near the circle or other shape). the sweep will sweep up and AWAY from the body of the model. If I pick the path at the top, then it sweeps correctly. While I am getting to like Fusion 350, there are certainly a lot of idiosyncrasies in the program.

I feel like I saw the solution to this in a recent Autodesk webinar... I'll see if I can find it for you. Tom Z

VERY Cool John, thanks for posting this. I've been badgering the F360 team for a while to sort out the thread function and also allow custom threads, so I'm going to have a play with this when I get some time, as I sometimes need to model custom and bizarre threads. In the meanwhile, have you tried constraining the sketch profile to some construction geometry?

if it helps i got this to work today. I was making an internal thread. I cut it about 0.5mm deep using the 'coil' triangle cut. I then made my thread shape triangle, used the Sweep, path & guide surface. Path was the tip of the triangle cut and the surface was the face of triangle cut. it swept a straight thread with no rotation of the thread triangle sketch

Look for the gear in the channel here: a360.co/1S9esjy

why is fusion the fkn worst at custom coils.

when I type negative heights I get an error :(

John, Do you think that you might be selecting one of the faces of the small V that you cut in the cylinder for the path. You may not be able to see it but never the less it exists. That causes the shapes to rotate when you extrude them.

This may be a bit late but I only just started with Fusion 360. +Goldenstein Engineering and Fabrication LLC was right in the comments about using a sweep with the "Path + Guide Rail" selected, but a simpler method is just to create a coil with a square section and use 2 edges of that coil that are horizontal as path and guide rail. You don't need his step 2. For some reason, you get the message "The sweep cannot produce a valid body" when you try to use 2 edges that are not horizontal to each other. Would anyone know why that is?

My solution: Make the helix the exact OD of what I want to thread Then make a path which includes the outer flat edge of the triangle Then sweep along path with guide surface

I think in SW it follows the normal. I have tried this in Fusion and it cannot be done. Also there was some other vid on Autodesk site where someone was trying to model the swept cut in a motor coupling.

Good video, not sure if you can answer this but were does someone learn Fusion 360, I've gone to the Fusion web site but there videos don't really help with someone who has never used a cad program before. Keep making videos I'll keep watching.

Here is a link to another way to make the coil and the shape can be a square and work ok. ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-hUAc6cVm2uQ.html

I ran into the same problem half an hour ago, took me a little while to realize doing join triangular thread .01mm away from the surface and use the flat face with the sweep tool's path+guide surface and that got me a straight custom thread, Fusion 360 still got it baby, oh yeah!

The process you were asking for is explained here: ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-1nhcKn7Kt8w.html

One issue that I see is your sketch plane is not normal to the sweep curve. In SolidWorks, picking a point near the start of the sweep curve generates a normal plane for creating the sweep profile. I am not familiar enough in Fusion to be able to tell you how too accomplish that unfortunately.

could you do a video on making a custom lead in/out with slit saws? im trying to create a tool path to use a slit saw with the work piece vertical . i need to lead in from the right about 1'' in & 1'' out from the edges but i cant figure this out. help me understand more pls

I encountered the same issues when trying to model a bottle thread. One solution is to use square coils for the ID/OD of the threads, then use patches to join the top and bottom 2D coils. gallery.autodesk.com/fusion360/projects/pco-1881-2-liter-bottle-neck

One thing I learned trying this, you can create the coil and project the 3d geometry in space from any edge

What about constraining the sketch to sweep around, so it is defined as parallel to the bottom? I'm not an expert neither I tried this idea, but from the logical perspective it could help

Hi David Finlay I think I made it. Check it out call "Spring" and download it and have fun.

Played around with this yesterday for modeling drill/endmill flutes etc... The quickest and easiest method I found was to do the external triangle coil like you did, then make a line through the center of the cylinder. Select the inside edge of the coil as your path and the centerline as your guide rail. That worked for me. For a drill/endmill I then just do a circular pattern as you would expect. I realize this is a year old video, but maybe this will help someone?

As the geometry has to make it twist the shape of any thing but a V ore a circle will rotate in it orientation around the cylinder deforming the thread , with out correcting the inner and outer distance plus end matting you going to get gack lmao :)

I think it is either a constraint you have to apply relative to the path and/or the initial orientation is off. I played with this at one point and wish I could remember better what the "ah ha" moment was. perhaps both. perhaps multiple constraints.

Thanks for the video, I got a question though... How would you transfer this coil/thread toa CAM operation ? How do you match the pitch/depth to a cutting tool ?Actually, my doubt goes a bit further as I´m not sure what´s better between creating a thread in modeling, or doing so in CAM as a threading operation.I`m particularly interested as I might need to model and simulate machining API threads on a tapered surface, and so far I´ve been considering an operation in CAM; as threading only appears to work on non-conical surfaces in the modeling environment.

Awesome. You just showed me how to make metric acme lead screw threads. Thank you good sir!!!

Have you tried putting the profile on each end of the curve and lofting between them using the actual curve as the guide rail? Possible in other software fusion I'm not sure about.

Are you trying common core math on your cnc one crash coming up . :)

I really don't know Fusion, but I had a go at your hack. Your problem is that the sweep actually is following your path with the sketch perpendicular to the path, not perpendicular to your "work" or to the coil ... Try this: * Make your cylinder * Add a Coil, set it to Triangular (Internal), Section position Outside. Keep it a size where you can see all three edges of the coil. * Next create your sketch as you like. * Go to Sweep the sketch, but set the sweep to Type Path + Guide Rail. Use the sketch as Profile, use the edge of the coil touching your cylinder as Path, and top of the other (outer) edges as Guide Rail.

You can also use the thread tool to create non-standard thread pitches with standard profiles by editing the XML configuration file. It is brilliant! See: forums.autodesk.com/t5/ideastation-request-a-feature-or/custom-thread-pitches/idi-p/5392371

If you get the orientation issue sorted, then you will need to make a swept shape which cuts away both a radiused root and a radiused crest on that thread. You might do the full root and half the crest on either side, or a full root and the full crest just above or below it. That way you will end up with a thread like a light bulb or a formed steel gasoline can cap. (And what looks like the Porsche turbo cap thread.) Once you have that, there will be the problem of how to cut this thread as an internal thread. The tool geometry will be interesting. It will need to cut a semicircular groove as it passes diagonally (along the thread pitch angle) through the workpiece. Lathe tooling to cut square threads has a similar problem. The tool is moving diagonally across the surface of the cylinder. At a minimum it needs much more side clearance than a normal cutting tool.

Cool hack John and John.

how would you animate a coil uncoiling about a tube

this fixtures saves me a lot of time when I do thread for 3D printing

How do I make a square coil?

Always awesome tutorials from you

P.S. use patch sweep keep it clean.

Thanks a lot 👍

Jonh your videos are always to a point and well done Mahalo. A while back you did one where you used a profile to cut away a different piece in the assembly. I'm trying to build a soft jaw to hold a hex part in a vise with an orientation so I can machine an offset disk on one end. Could you be so kind and send me the name of the video.