Is the following sentence structure grammatically correct? I mean, I've found a lot of examples that have this structure but not at the beginning of the phrase but with a subject before. Here is an example I'm trying:
For designing the 3D model of a new tool it's necessary to be sure...
UPDATE: This is the research I've done:
For + verb-ing: the purpose of an object
However, if we are talking about the purpose of an object or an action, we normally use the for + verb-ing pattern. Note that this pattern commonly answers the question: What are they (used) for? Compare the following:
Schools are for educating children not for entertaining them.
Schools are for learning. Life is for living.
This kitchen knife is especially useful for slicing vegetables.
What's this for? ~ It's for opening oysters. It's much better than a knife.
What's this fifty pound note for? ~ It's for buying food for the weekend.
Note that when the subject of the sentence is a person rather than the thing described, the to + infinitive pattern is also possible:
I use this small knife to slice vegetables with.
I use this gadget to open shellfish with.
As it is explained it can be used with a subject before, but I haven't been able to find anywhere something explaining the case when For + verb-ing is at the beginning of a sentence