Recently, this question was closed as of topic. It is referencing a CNC controller. So, are CNC related questions off topic? Why is there a CNC tag then?

Furthermore, if one reads the question it becomes clear, that the OP wanted to convert a 2D drawing to G-Code. To my knowledge, G-Code is relevant also for the robotics community, as there are robot models, which are programmed using G-Code (Mitsubishi robots, if I am not mistaking).

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I don't think CNC is off-topic, but that question asked specifically:

My question is that is there a software that could read an AutoCAD design or any DWG file and produce a CNC program for 2D profiling? Preferably at free of cost. (Broke student here) Thanks in advance.

From the Q&A is Hard, Let's Go Shopping post that Ben linked (and is in the standard closing template):

Here’s one way to ask:

Q: What’s the best low light point-and-shoot camera?

A: Canon S90 and Lumix LX3.

Here’s another way to ask:

Q: How do I tell which point-and-shoot cameras take good low light photos?

A: I strongly recommend looking for something with

  • a fast lens (2.0 at least)
  • reasonable ISO handling (at least 400, but preferably 800)
  • the biggest sensor available

The sum of these factors are really critical for low light situations.

The former question provides the path of least resistance: a laundry list of products I can buy without thinking about it too much. But that answer will only be valid for a year at best. The latter question may take some thinking, but its answer will be valid forever … or at least until camera technology somehow shifts beyond lenses and sensors as we know them today. Thus, when it comes to shopping questions, don’t ask us what you should buy — ask us what you need to learn to tell what you should buy.

If I had to summarize our network in a single word, that word is “learning”. People come to our sites to learn about topics they are passionate about. As the old Chinese proverb goes, “Give a man a fish and you feed him for a day. Teach a man to fish and you feed him for a lifetime.” Every question and answer ultimately should be about teaching and learning — yes, even the shopping ones.

So it's not that questions about CNC are off-topic, but that the OP for that question asked for free software. It wasn't a question about how a CNC machine builds a command queue, or what kind of code runs a CNC machine, it was a question that OP could have just googled instead. The number two result there for me is the list of free software you provided in your answer.

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  • $\begingroup$ OK, it seems that I was mislead by the comment, which suggested to re-post the question to Engineering SE, suggesting that there is no problem with the questions itself, but the topic. $\endgroup$ – 50k4 Aug 4 at 15:02
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    $\begingroup$ Yup,. as written, it was clearly a shopping question, however with a little tweaking, I made it a valid question for Robotics. I know it has already been re-opened, and answered, but the fewer broken windows we have, the better. $\endgroup$ – Mark Booth Aug 5 at 16:42

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