T8 Lead Screws.

[mrfoameruk]

It would be nice to have lead screws.
i have tried making them with the screw function but cannot do it as there are multiple spirals going up a rod where the other just seem to have 1 spiral. I also think the spirals are a different shape. I won't be making screws but will be using it for holes in printed parts.

[henmedia]

Thanks for the suggestion. You're right: layerling's threads have one start only, so a multi-start thread like a T8 with a lead of 4 or 8 mm can't be made at the moment. A single-start one, lead = pitch (for example a T8 with 2 mm), should come close with the custom size (diameter 8, pitch 2) and the trapezoidal profile. I haven't tried it against a real spindle, so please check the fit before you rely on it. For the holes in your printed parts, a nut of the same size with some clearance does the same.

[mrfoameruk]

yes the 2mm looks about right. But a lead of 4 is totally wrong (and the 8mm pitch is not even allowed as 6 is the highest). thread should be about 1mm deep on a rod of 6mm but the threads look like 2mm on a 4mm rod.

Hopefully this shape can be implemented at some time. Multiple starts, lead length (how far 1 revolution will get you (usually 1mm, 2mm, 4mm, 8mm) and pitch (distance between 2 threads (usually 2mm

Below is the 4mm pitch which is a far way from the actual item.

), length, chamfer, etc.

Thanks

[henmedia]

@mrfoameruk you're right on all counts, and thanks for the clear numbers. A single start with a 4 or 8 mm pitch gets that much deeper, because the depth follows the pitch. Threads now have Starts: for a T8x8 set Diameter 8, Pitch 2, Starts 4 and the trapezoidal profile. Each of the four threads is as deep as a 2 mm one and climbs 8 mm a turn; the note under Starts shows the lead. It works for rods, screws, nuts and tapped holes, so a T8 hole in your printed part is a tapped hole with these values. It comes with the next release.

[henmedia]

@mrfoameruk this is out now in layerling 1.146.0: threads have Starts. For a T8x8 set Diameter 8, Pitch 2, Starts 4 and the trapezoidal profile.

[mrfoameruk]

Looks OK. Will try it when we get back from holiday.

Thanks