[louieatienza]

the problem is that I will used round flange housing like this :



Is it also possible?

Depending on design, no modification may be needed.

And contrary to what is otherwise said, backlash does matter significantly. Of course a lot depends on machine use. Truing casting surfaces? Maybe not. Jewelry work, PCBs? Maybe. But by far, the biggest problem I see here in this entire forum regarding positioning? The circles are not round. I have minus tolerances on my inside cuts and plus tolerances on my outside cuts. I saw one thread where the guy couldn't grasp this concept and it drove him nuts, to the point of selling his mill.

And no, in a perfect world we'd make all our machines of cast iron and epoxy granite. But we make with what's available to us and what we can work with. And there's absolutely no way to say what is ideal without asking the ultimate use of the machine. For cast iron, stainless, Inconel... maybe not. For aluminium and brass, plastics, PCBs, it's well adequate for the job.