Fasteners Workbench thread and head scaling

[chrisb]

Great extension! BTW: what printer and what material did you use?

[shaise]

PLA on original Prusa i3 MK3

[chrisb]

Thanks. Threads make a good printer test.

[MostlyHarmless]

This is great! Thank you so much.

I finally found some time to overhaul my entire software setup to match my i3 MK3 (boxing the latest versions of FreeCAD and Slic3r-PE into docker containers, upgrading OctoPi ...). This just worked out of the box on first try.

Thanks again,
Jan

[buchvi]

Hi, thanks for this, it helps a lot not having to think about scaling the bolt in slicer.

But what if I need to print a larger part with screwhole, not just the nut? If I just boolean-cut the hole with the screw, the hole will be too tight when printed. Would it be possible to add function like "boolean cut" that would use scaling options from the Fasteners workbench settings?

[shaise]

There is a special "threaded rod" used to boolean cut threads in holes. It should be scaled with the same settings so that the cut holes are as wide as nut threads. But I need to double check if this is the case, If not, I'll fix it.

shai

[buchvi]

I see. But the boolean-cut hole will be the same if I use for example M8 screw and/or this rod set to M8, right? But If I design nut with 3D printing settings on, the hole in the nut is a bit smaller, according to settings. So while the nut screws on the screw correctly (and they do, thank you very much!), for the boolean-cut hole in some other object this wouldn't be the case, the hole would be too tight. Do I understand it right?

[chrisb]

Look at the settings of fasteners, you have two settings for inner and outer threads. If you want to cut a thread yourself you first have to create a tool with the counterpart.

[Frank Sonne]

Look at the settings of fasteners, you have two settings for inner and outer threads. If you want to cut a thread yourself you first have to create a tool with the counterpart.

Where do i find out how to do a tool with a counterpart? I have this exact problem, i've wasted 2 parts printed twice, with absolutely no difference, with different scale. No fun when parts are in M42, and time consuming, 12h wasted on every try, would really like to get it right on my next print.

A setting on the ScrewTap for Boolean-Cut "True/False" would have been nice though.

Regards
Frank

[shaise]

Where do i find out how to do a tool with a counterpart?
Frank

If you want to make a tapped hole, use the hole tap tool:

ScrewTap.png (1.33 KiB) Viewed 42 times

This might look like a screw, but actually its a "reversed screw" that is specially designed to make tapped holes into solids. When using the 3D printed mode, this "screw tap" is getting wider, creating the necessary space tolerance similar to nuts. It can have arbitrary length.

shai