Join two Cylinders

[JAyThaRevo]

I am a pretty big noob when it comes to CAD software, but willing to learn .

So I am making a model of an 20kV cable for a later FEM simulation. For that I created a bunch of cylinders which looks pretty good so far. But now I need to create a small hole on the side of the cable. By using logical operations I managed to combine and cut out the necessary parts. The only problem I am facing is, that the once single piece cylinder is now a two piece cylinder. I made a bunch of screenshots highlighting my problems. Especially on the last one you can see that I can only look through the first layer, but I need to look down all the way through to the most inner cylinder. So is there a way for me to join these cylinders again?



OS: Windows 10
Word size of OS: 64-bit
Word size of FreeCAD: 64-bit
Version: 0.16.6706 (Git)
Build type: Release
Branch: releases/FreeCAD-0-16
Hash: f86a4e411ff7848dea98d7242f43b7774bee8fa0
Python version: 2.7.8
Qt version: 4.8.7
Coin version: 4.0.0a
OCC version: 6.8.0.oce-0.17

[chrisb]

Did you pocket through all? Can you attach the model, possibly stripped down to show nothing more than the problem?

[JAyThaRevo]

Thanks for the reply chris. I attached the model file. If you look at the small cylinder in the middle there, you will see that there are two of them. What I need is to join them together so I have only one, enabling me to look right at the center cylinder in the middle from the outside.

[Willem]

The screenshots show correct what you designed in Freecad. The line you highlighted in sketch UNBEKANNT2 SHOWS the cylinder with a radius of 9 mm you fused with cylinder76. This tiny cylinder is a hole that goes from the center on one side through the cable.

[chrisb]

You can clone the small cylinder and subtract it from Zylinder004. To get an inner layer you could make a union of all these subcylinders Zylinder003-Zylinder075.

I know that it is embarrassing if you ask a question and you are overwhelmed with a complete redesign. But you might want to redesign at least the circle of 72 cylinders by using a polar array.
If possible, fuse the things together you want to keep. Fuse the things togehter you want to cut. And then make the cut.

[JAyThaRevo]

The screenshots show correct what you designed in Freecad. The line you highlighted in sketch UNBEKANNT2 SHOWS the cylinder with a radius of 9 mm you fused with cylinder76. This tiny cylinder is a hole that goes from the center on one side through the cable.

Exactly, but if you look at the last pic I posted I am not able to see down to the center conductor. From the outside I am only able to see through Cylinder002. Cylinder001 seems to ignore the cut and blocks the view.


@chris: Ok, I will look into polar arrays.

Thanks so far everyone!