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I am thinking in building a circular washbasin mounted into a 3mm steel plate. To do it, I need to cut a circle on the plate. I don't have much, just a cheap 1250w grinder and the discs that came with it.

I would like to ask you:

  • Do you think my grinder will be enough for this? Should I buy new specific discs?
  • Do you think my circle will have many imperfections? how could I refine it?

Thank you so much!

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    You are trying to cut a circular hole in the plate to mount the sink in? i.e the hole left in the plate is what you need to have be "good" rather than cutting a circular disk? A disc grinder will do poorly at making a nice hole. – Ecnerwal May 22 at 10:48
  • Would this be a stainless steel plate? – Jim Stewart May 22 at 10:53
  • @Ecnerwal Thank you. That's it. How would you do it? – riqui May 22 at 10:58
  • @JimStewart No, just steel. I will paint it after. – riqui May 22 at 10:58
  • I've cut 3/8" angle iron with one of those grinders... Just need to keep control - strong wrists... – Solar Mike May 22 at 11:05
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Do you think my grinder will be enough for this? Should I buy new specific discs?

3mm? A number of abrasive wheels can cut that easily.

Do you think my circle will have many imperfections? how could I refine it?

Depends on the diameter of the circle and how much control you have. Angle grinders have a high rotational inertia and wouldn't be my first pick for trying to cut a perfect circle. Maybe a smaller tool like a Dremel, or maybe a cutting torch might be better. I would practice on a piece first if you can.

  • I agree that a torch would be better but I use thin metal cutting disks all the time for cutting steel. It will take longer than with a torch but it can be done to make a perfect circle make your original cuts and leave the line then go to a thick disk and work your way to the line.+ – Ed Beal May 22 at 13:05
  • Thank you @Machavity . Dremels are quite small and usually doesn't have much power, let's say ~200W. I could consider buying one, but, don't you think it could be not enough for cutting a 3mm steel plate? – riqui May 22 at 13:51
  • Thank you @EdBeal, it is very useful. – riqui May 22 at 13:51
  • @riqui The idea behind a Dremel is that it wouldn't be fast, but it would be precise. Again, an angle grinder could do the job, it's just harder to control. – Machavity May 22 at 13:55

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