I have a set of large wood chisels given to me by a person that has never used them and doesn't know their history.

I attempted to turn a small test bowl with them, but had tear-out type issues.

How can I tell if the wood turning chisels are sharp?

1 Answer 1


How can I tell if the wood turning chisels are sharp?

As with any edged tool you can simply feel the edge (carefully) to check if it's sharp. Almost all traditional woodworking books show a chisel or plane iron's edge being testing with the thumb. However, it can be difficult to judge just how sharp something is by feel — sure it's sharp, but how sharp? — so more empirical tests can be a better idea. So directly testing the edge for cutting performance would be my recommendation.

One empirical test that is often used today is to see whether a tool will easily shave hair from your forearm, which is a particularly good test of a high degree of sharpness but it is not ideal as you can easily run out of arm hair if you are testing many edges over a short timeframe. And there is obviously the problem that not everyone would find bare patches on their arm acceptable in the first place :-)

Probably a better test is to directly use the tool on wood. Paring the end grain of a softwood such as pine is a very good acid test of sharpness. You do this with a softer softwood and not a hardwood because the soft parts of something like pine will easily bend over (showing as tearing of the fibres) instead of being sliced cleanly. A good edge will slice pine end grain and leave a uniform surface behind, if it's very very sharp indeed the surface will be nearly glossy.

In case you are unaware, woodworking chisels usually need to be sharpened or honed frequently in use, as often as a few times an hour. As well as that, few are supplied sharpened and ready to use so they need honing before their very first use too.

Two related threads that might be of further help:
What should one consider when purchasing an intro turning chisel set?
What are these blemishes called and how do I avoid them?

  • Best bit of sharp wood turning chisel advice I’ve seen. Never seem to get my wood turning chisels that sharp? Dec 14, 2020 at 7:48
  • @JohnCornwell, there are a couple of things worth trying to further improve sharpening results on turning tools. One of the major innovations of recent years are CBN wheels and they can be a real game-changer for turners, but it's also worth looking at using a burnisher to finish the edge (generally done on scrapers), as well as hand-honing with a very fine stone or diamond plate in some circumstances.
    – Graphus
    Dec 14, 2020 at 21:30

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