Adding Taps on Holes in a Dead Volume

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1

Hello

This question is related to the one in the post:

https://www.lynkoa.com/forum/catia/d%C3%A9tection-des-taraudages-et-stl

I have a dead volume part (stl file) in CATIA. This room has holes. I would like to add taps for these holes. So I try to use the "tapping" function. Apparently, it allows you to add threads.

Problem: I can only select half cylinders for the cylinders for which I want to add threads and I can't select the 2 half cylinders to select all the complete cylinders in the "taps" function.

How can I select multiple surfaces for the definition of the cylinder used in the tapping function?

If that's not possible, I might have an idea when I went to GSD. I would have to create a complete surface (cylinder) from the 2 selectable half-cylinders. However, I don't see the functions to use in GSD to do this anymore. Could you enlighten me on this bypass if you think it can succeed?

Thank you in advance for your advice.

2

On solidworks when I have the same problem by importing a step or other neutral format, I fill the hole and then I create my drilling + tapping function.

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3

Hello

I share @sbadenis ' opinion on a WWTP this solution and the right one,  it's also true on an STL but the surface cutting related to the mesh makes the operation more tedious.

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4

First of all, see another post, sorry but I apologize yesterday for my mistake. My part does not come from an stl file but from a step file.

To come back to my problem (adding taps on holes in a dead volume) ok for your suggestions.

On the other hand, I find it a shame here because there is a tapping function. Also, could you help me to set up solutions where we add the threads on the existing cylinders?

To do this, here are the elements I need:
- Is it possible to make a multiple selection of surfaces for the cylindrical surface?
- otherwise, how can I reconstruct a cylindrical surface from the 2 half-cylinders that are selectable from the holes of the dead volume part (from the step)?

Thank you in advance for your ideas.

5

In CATIA, the option of multi-selection is indicated in the order by an icon in the shape of a bag of marbles.

This is not the case for the thread control so no you can't select the two half cylinders.

You're on a solid closed there are several leads, all go in the direction of @sbadenis ' answer

Hack solutions.

  1. I will first try the front removal command on one of the half cylinders (it should recreate a single cylinder).
  2. Otherwise I will create the center point of the hole then I will make a bigger hole (1mm) then an extra thickness of (1mm) to find the initial diameter.

Edit : if you have the FR1 add-in you can also try a function recognition on the holes.

6

"If you have the FR1 add-on you can also try a function recognition on the holes." I'm in the 3DExp so I probably have a number of functions.

Can you remind you what the FR1 supplement is and where it is located?

And also what does the "surface removal" function look like and where can we find it on your side in V5?

Thank you

7

Feature recognition

Function Recognition This module is used to recreate functions (a graph). On mechanical parts, he was able to recreate radius, chamfer, draft, pocket, etc.

Be careful before using it is best to keep a copy of the original if only for comparison.

Under V5 it is activated in Tools/options/management of shareable products.

Then this adds the following cmds under PartDesign.

Edit : Face retract function

8

Hello

The "Feature Recognition" tool worked very well. The only point to be careful is that you also have to select the bottom of the hole.

Then I was able to re-edit the hole and easily add the tapping.

Thank you for your advice!