I am trying to create a smooth spherical depression in wood that, the depression is 1.75in in diameter and 0.5in deep. I have access to a drill press, fixed router, and some chisels but I am not sure about the best way to go about achieving this depression in the wood (I am working with cherry) any suggestions about how to achieve this? The shape I am hoping to achieve is attached in the link.





  • If I'm understanding you right, I'd do this with a forstner bit in a drill press. Forstner bits make very clean holes. You don't have to go all the way through; just stop once the right depth is reached. – Charlie Kilian May 30 '17 at 4:12
  • The side view made no sense to me initially, I couldn't figure out what the upward-curving lines represented because you didn't mention them in your post. That's a lid presumably? That's going to be quite the challenge! Anyway back to your Question, this may not be possible with the tools you currently have available. You can do this kind of thing with a router (hand-held) and a jig, but I'm not sure if it's feasible due to the small scale. Other than going handtool-only (you'll need to buy either a gouge or two or a scorp, plus a gooseneck scraper) I can't see how you'd do this. [contd] – Graphus May 30 '17 at 7:06
  • The way to do this is with a lathe, both parts are relatively simple and easily done bits of faceplate turning. – Graphus May 30 '17 at 7:08
  • Yeah it would be for a lid. Would it make sense to use a forstner bit for the interior part then use a band saw to cut a square in the top and sand it down to a circle? – ptrickono May 30 '17 at 9:57
  • This doesn't seem to be a "circular" (i.e. cylindrical) depression, it looks to be a spherical depression. (If so, I agree with Graphus, you'll want to either turn this or use a scorp unless you can find a huge core box bit.) Could you please clarify the text of your question? – SaSSafraS1232 May 30 '17 at 16:26

If you want to create this with the tools you mentioned you'll need a "core box" bit. This is a plunging router bit with a spherical profile.

To determine the size we'll need to determine the radius using the formula:

r = h/2 + w^2/8h

Plugging in h = 1/2 and w = 1 3/4 we get an answer of 1 1/64". Since core box bits are typically sold by diameter you'll need a 2 1/32" bit. If you're ok with something close you could probably use a 2" bit.

I'd be VERY careful with this operation, though. Plunging a 2" bit can be quite dangerous. Make sure that your workpiece is well secured and you have your router very stable. Honestly I wouldn't personally attempt this operation.

  • Since I'm generally always trying to practice safely I think that I would be best off trying to create these shapes using a scorp and gooseneck scraper. Alternatively I was thinking of using a larger drill bit to create a "center point" and trying to sand out the shape from that with a dremel, do you think that could work as well for the interior half spheres? – ptrickono May 30 '17 at 21:10
  • @user161010 - Yeah, that's definitely how I'd do it. I think you'll have more luck with the scorp than with a dreml though. I'd also consider using an angle grinder. You also don't have to limit yourself to just the center hole. You can put in "target depth" holes all around the area to help guide your work. – SaSSafraS1232 May 30 '17 at 21:50

You could try using an angle grinder with the right accessories:

enter image description here

When it comes to carving, shaping and sanding wood there are many effective tools to consider. Only one however, can be quickly adapted to accomplish all three of these common woodworking tasks with ease. The angle grinder.

If you are a woodworker looking for a fast and easy method to quickly carve, then shape, and finally sand out large gouges and even chainsaw curfs, the angle grinder is the tool for you.

Keep in mind though, the angle grinder will remove much wood in a hurry, and like all power tools, when using your angle grinder on wood, be certain to wear safety goggles and other appropriate PPE.

And for finely detailed woodworking projects you may consider other, less aggressive alternatives.

More information in the original article:

Source: http://logfurniturehowto.com/how-to-use-an-angle-grinder-on-wood/

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