Hi,
I’m missing a thread milling option, would be awesome if that wase implemented 
Like in the Makera CAM:
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That’s what the Helical operation is for.
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Oh wow, I didn’t realise that
Now I need to figure out how to use it
how do I setup my tool? Like this?
So if I wanted an M3 threaded hole I drill 2.5 mm hole and I want a pitch of 0.5/mm (like on this chart: Metric Thread Tap Drill Size table M1 to M64 - anzugsmoment.de ), and use the helical like this?:
Am I in the right direction?
Looks correct as far as I can tell
Hey there, author of the Helical Op here.
Thread-milling isn’t officially or fully supported, but it is in the works. To integrate thread milling with the whole system, the animation system and the tool system need some major changes.
as of right now, you would set up your tool as an end mill, ignoring the teeth of the threadmill. Generally, your settings look good, but you may want to play with the Center Entry Offset which can keep your tool from slamming directly into the side of the hole.
Regardless, I’d love to get some feedback on how it worked for you, and what can be improved.
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I’ll try tomorrow on some sikablock, that’s hard enough to mimic wood, but soft enough to not kill my bit if it goes wrong, and I can get that from work for free, hehe.
Awesome! I just discovered some bugs in the Enter from center code, so perhaps wait on that until my patch gets pushed to production, but otherwise best of luck, and looking forward to hearing back.
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Well, I can’t get it to select a hole 
I keep getting: “Faces must be circular” and “face’s normal must be perpendicular to Z axis”
I’m sure I’m doing something wrong
When I use the help screen to view documentation I get: “Page Not Found
We could not find what you were looking for.
Please contact the owner of the site that linked you to the original URL and let them know their link is broken.”
when I go to a working URL I can’t find anything about the helical operation.
I found i could only select the hole by clicking certain places within the cylinder but not others
This is my test workspace:
workspace_holetest.kmz (330.5 KB)
I thought I had fixed those links with a docusaurus plugin. I’m looking now and I’m not seeing them though. @stewart do you change anything there, or am I remembering incorrectly?
I’m sorry selection isn’t working. I’ll take a look.
re-added redirs for the broken links.
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Confirm working link
Wow an error message….when I have ellipse resulting from intersection of a round hole and a round part …nada….l make a dummy rectangular part so I can have round holes and then the program finds them….
workspace (31).kmz (304.3 KB)
But when I use your workspace I CAN select the holes, but there is no gcode generated for the helical operation (I added).
What I am trying to say is maybe this type or workaround might work…and maybe not for helical operation.
I found the cause of the bug. When setting my angle tolerance for finding cylindrical faces, I used a tolerance of 8degs. It works as expected when I raise the angle to 10degs. You can temporarily work around this by exporting your part with a higher level of detail.
Thanks for being a bit of a Guinea pig for me.
I’m not sure where configuration for this feature should go, since it doesn’t really fit in the operation options or process options. Preferences tab?
You’re welcome, @meddesign I do my best lol.
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I made a higher detail STL and now it detects the hole, but I have a strange issue with my M4 bit:
I drilled a 3.3 mm hole and used the helical just like other holes, but it doesn’t do the helical rotation like the others.
I had it’s diameter on 2 mm and then it didn’t create a path at all, when I changed it to 1.98 mm it creates a path but no helical motion.
the M3, M5, M6 and M8 seem to work fine.. also if I use the M3 in the M4 hole it does helical motion but only the same diameter as the M3. when I select the M3 for M5 hole it does the right diameter.
Is there something magical about 4 mm ?
workspace_hole_test.kmz (412.4 KB)
I changed for all helica’s the M3 bit and you can see it uses the same diameter for M3 and M4 hole, but also the same for M5 and M6 hole (using the M3 bit for everything is impossible as it has only a 9mm depth, but theoretically it should be milling this.
Also, it may be a prespective thing, I thougth I had to do the helical counter-clockwise if I started from the bottom, but I need to set it to clockwise to mill it counter-clockwise, but the thread it actually clockwise, if you would mill from top to bottom you would mill clockwise for a clockwise thread.
@BakedPotatoLord can you take a look?