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FreeCAD Path Workbench Tutorial - The tutorial nobody asked for...
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- Опубликовано: 8 дек 2021
- I walk you through the process of creating a wax mold from concept to completion using FreeCAD's Path Workbench. FreeCAD has a surprisingly robust array of tools for 3D surfacing, profiling and more.
Maybe nobody asked for this tutorial, but I'm 200% glad, you did it, nonetheless :)
Thx a lot, I learned quite a lot about the PathWorkbench again (and some extra tips and tricks on the way)!
I am shore that I will come back again when I know more. It was really better for new beginers like me to have it in 2 video's and teach us some more :) I know, I know I am being greedy :) thank you for sharing
Excellent tutorial. Thanks for making it.
the ending of this video was pleasing
Thanks and great video!! I didn't ask for it but definitely was looking for one of those ;) Again great work and effort, really appreciated! Great to know now things I was trying to figure out by myself by ages :D:D
Good video. Thanks for doing this.
thank you I do need it
Great video ! Thanks for the will, time and efforts to share this with the world 🙏To get the profiles of the lower gears, a nice solution is to create a shapebinder object in Part Design workbench. Also NotePad++ or other more advanced text editor with syntax highlighting makes editing G-code so much easier. TY
ShapeBinder. I just read it's page in the FreeCAD user's guide. I'll keep it in mind for my next project, should opportunities for it's use arise. Thanks for the tip!
Thank you
Awesome! Thanks for the info. Does Centroid still crash on the newer versions?
I haven't tried it, but the resulting gcode would probably be almost identical, just maybe some differences with the preamble or something. They were aware of the crashes back in v0.18, so it's probably pretty low priority. If you can't export with centroid, you can always switch to a different one and export...
Thanks again. Ill try it out. I havent tried to use gcode from freecad yet. New to freecad. just trying to figure it out. I use centroid software though to run my machine.
Path Workbench!!!
Hello, great tutorial!, i have a question though: how do I select a specific post processor when I export my gcode?
Thanks! :) The prost processor is a property of the Job on the treeview. If you select the job, you'll see the post processor in the data properties. If you double-click the Job to open it up as the active task, you can change it from the Output tab. Data properties is probably the easiest place to find/change it after you initially create the Job.
@@WhitmanTechnological Ok, I edited it by double clicking the job, and changing the parameter from the "output" tab in there, but your solution it's faster thank you very much!
Just curious, what are those two laser units for on the cnc machine?
I saw someone else with a laser X on their router and thought it was cool. I designed my own router, and I wanted to know that I could play with the open source grbl software that was controlling it. The lasers make an X on the surface where the bit will plunge. I spliced my own code into grbl to toggle a pin on the microcontroller, and I wrote it to listen for M61 to turn the laser on, and M62 to turn it off. Just a little excuse to play with lasers and familiarize myself a little bit with modifying the router firmware. It's not even remotely useful, but it looks cool. XD
I am trying to cnc gears using path. I 3D printer the gears to make sure they can handle torque and had best gear reduction and now want to cnc them out of foam for lost foam casting into aluminum. No success so far. on the path workbench for gears. I have no problems with other items with flat and curved walls but teeth just don't happen. Appreciate any advice.
To get the router to make incremental passes that cut out the teeth nicely, you need to select a face that has the teeth edges as either the inner or outer edge. At 15:24 you can see I select the top of the gears and then use the Profile with the outside of that face to get a path that cleanly cuts the teeth and out. And then around 18:52 I select the face inside the rings and use that outer edge to profile the inner teeth. Profile will compute the path that will precisely cut out the inner or outer edge of whatever face(s) is(are) selected. Make sense?
Thanks,, funny I can try dozens of times without success and one minor change it it works easy and perfect. Have a great day.@@WhitmanTechnological
I'm sure you have better things to do, but is there any chance you can make a video showing a walk through of this, but with cutting out a dome piece from a square stock with roughing and final paths? This video has been very helpful, but im stick having issues with a vertical arch path.
The path workbench tutorial that @wantafastz28 asked for?? The process isn't too much different from the steps I took in this video. To see if there were any quirks, I tried it out in FreeCAD. I made a 15mm diameter sphere, and a 30x30x12 box that intersects with the upper half of the sphere so I have a hemispherical dome, and a stock piece to cut it out from. I did a 3D Surface with an endmill to rough out the material, using multi-pass operation to take it in steps. Then I di another 3D Surface operation with a bullnose endmill. I noticed the simulator didn't want to simulate unless I switched the bit to an endmill. I also noticed that switching to an endmill moved the cut paths away from the model - so FreeCAD is definitely able to determine paths for bullnose and ballnose bits, but the simulator might not work with those bits.
Once you have those two sets of paths, you can choose the parameters that give you the kind of surface finish that you want - ballnose with a 5% stepover so it stays really tight to the model, for example. Zig-zag or spiral finishing path. Whatever gives you the look you want for the surface.
Here's a link to the file I made just now, if you want to see what I did:
joshwhitman.com/cut%20sphere%20from%20block.FCStd
Edit: I did the "spiral" roughing pass in the file just to see what the spiral path looks like, you can use any of the path patterns you want for both roughing and finishing.
@@WhitmanTechnological wow, thank you such much for the reply. So far you have shown the best explanation/way for making a roughing pass and then final with editing the tool size. I’ll be looking into that file shortly. Thanks again!
11:14 :)
That just made my morning, lol.
Dear Sir, How do I get Path to not re machine empty space. I am using a CNC router to put a 12" diameter x 4" deep dishout in a 14" square x 4.5" thick block of wood. I go in with a 25mm ball end mill, and using 3D pocket, rough out the bulk of the material. Then I try to go back, and use 3D pocket with the same tool but with smaller step downs, and 10% step over, (to get a smother surface) and it proceeds to re machine the entire block as if the first cut never happened. Don't get me wrong. The fact that Path even exist, as well as FreeCAD itself is mind boogling to me, and I am more than eternally grateful that it exist. What am I missing? What should I do differently? Thank you for your help in advance, and thank you for the tutorials.
Roland
So the first one is the pocket where it's carving out all the material, and you select the bottom of the pocket for that operation. After bulk removal, I think you want to do a Profile operation instead of a second 3D Pocket. You might be able to select just the bottom face, or you might need to select the vertical walls. I'm pretty sure there's an option for outside or inside - you'd probably want inside for the inner walls of a pocket. You can set a tiny step down to get a nice surface finish. I'm pretty sure that's the one you want. I'm travelling so I can't test it. Let us know how it goes!
@@WhitmanTechnological Dear Sir, Thank you for getting back to me. Here is what I'm trying to machine. Picture half of a basket ball sitting on it's apex with the open end up. The walls are about 10mm thick. I need to rough out the inside material, and then come back and smooth off the inside walls. I don't see where I can send you my FCStd file, or I would. I'm in no hurry for a solution to this problem. Thank you again.
@@kb3cxe Back at home now, I can hop into FreeCAD and set up something like you describe. You do a 3D Pocket first to carve out all the material. And then you do a 3D Surface operation for your finishing pass. Whereas the pocket expects there to be material to remove in multiple passes, the surface assumes all excess material is already removed. Does that work?
@@WhitmanTechnological Thank you for all your help. I'll give it a go, and see how it turns out. Thank you again. Roland
@@WhitmanTechnological Dear Sir, Thank you for helping me out on this. Where do I find the 3D Surface function? Thank you again. I'm using a 2022 MacBook Pro, OS 13.4, FreeCad 0.20.2