handrail in half section

[Pese83]

Good evening,
I have a problem with a handrail I have to work on cnc 5 axes.
This is the file I have to work.
to work it I need to create a counterstamposium where to house it once worked the first half, but to do so, I have to cut half the cylindrical section and get the same development but with a semicircle section.
I tried to redesign it starting from the already semicircle section, but climbing the sweep gradually rotates the section and get the result in the second image.
how do I draw the solid exactly half, or redesign it with semicircle section? (as highlighted by red lines)

thanks to who can help me

 

[Cristallo]

that of the second image is the correct development of a semicircle along the path.
What you want to get, I think you generate big joint problems in the curve that goes up. to verify the problems I speak of, try to dissect your solid (slice by 3 points).
the sections once half of the horizontal portion, preserving both the resulting elements.
then sections along the sloped axis that climbs up, always keeping all the parts, then as you delete what you don't need. You will see that a strange edge is born in the double curve of the area rising upwards.
the only way to get a solid as you require (but I don't know what geometric results) would be by just making various sections along the highlights and using a loft for sections.

 

[rpor66]

you can build half curve using a helix as path, 2 regions appropriately aligned to the heliixusing loft command, select the 2 regions and use path option

 

[Pese83]

that of the second image is the correct development of a semicircle along the path.
What you want to get, I think you generate big joint problems in the curve that goes up. to verify the problems I speak of, try to dissect your solid (slice by 3 points).
the sections once half of the horizontal portion, preserving both the resulting elements.
then sections along the sloped axis that climbs up, always keeping all the parts, then as you delete what you don't need. You will see that a strange edge is born in the double curve of the area rising upwards.
the only way to get a solid as you require (but I don't know what geometric results) would be by just making various sections along the highlights and using a loft for sections.

I took it last night and managed to get what I needed.
It was actually easier than it seemed.
with the foreign command isolinee I obtained the 2 "lateral" paths, I closed the ends of the paths with a simple line, and with the command close the surface I obtained a surface that cuts in 2 the piece.
I converted the solid into nurbs surface, and with the created surface I cut it in half.
the image is a little disgraced, but you should understand. .

 

[Cristallo]

I took it last night and managed to get what I needed.
It was actually easier than it seemed.

Here's how it behaves who can use what many define a dinosaur as a program.
Congratulations to you.

 

[Tristus]

"sweep long trajectory" rotates the shape because it must necessarily make point 1 coincide with point 2, (as from attached images) and to make it dece to rotate the last section of the section. Otherwise it would be impossible to get the result you want.
impossible even by extracting isolinees.
I tried to extract them and came to this result.

unless, by connecting with corners the lines that form the path, everything does not settle.
But the fact that autocad turned you the last section despite the fittings, in my opinion means that the obtained solid is not correct, as it is impossible to get it.

the best solution is that proposed by rpor66, that is to build a elbow and a propeller so that in that stretch the shape rotates correctly