Has anyone figured out how to create a vector in Lightburn that cuts a helix on a cylinder using a rotary?

Not me, but I would design the pattern as if the cylinder was unwrapped and laying flat.

That makes sense. Now just have to figure out how to do that!

Draw a diagonal line across a square with dimensions matching the height and circumference of your cylinder.

Thanks. I get it

Hi.

The simplest approach to the helix cutting would IMO be to use basic thread geometry, because it’s pretty much -if not exactly- the same thing.

Because Google nowadays is what it is and I’ve somewhat lost the touch to work the modern search algorithms to my advantage, this:

is the closest “simple” explanation I could find with a quick search.

Regards,

Sam

Yes, but you would have to also build a left-hand thread to match the right-hand thread to get the helix. I am pretty sure this would eliminate the mismatches like in my LB file.

My drawing was a quick and dirty job. But it illustrates how it might be done. Of course, you would actually need to work on things like line spacing to get it right. Lots of calculator work might be needed.

I borrowed the comment by @dos end expanded it.

Helix.lbrn2 (27.8 KB)

Thanks so much. I will check out your file.

Do you want a helix for a pattern or are you actually going to use it mechanically?

Just for a pattern.

Hi.

Only if a more intricate multiple-helix pattern is required.

Like in the case of a diamond hatch on a cylindrical object in Your .lbr file.

A simple one handed single helix turn using a rotary is just a diagonal line across a square with dimensions matching the height and circumference of the cylinder, like @dos said earlier.

We (at least I) do not know -and quite frankly we do not need to know- how the information about how to acchieve a certain geometry is going to be used by the OP, so IMO the simplest possible example and the basic theory behind the geometry is the most natural starting point.

When one grasps the very simple principle of the shape in question, it can be easily expanded and manipulated as far as needed to.

Regards,

Sam

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