Regarding the chisel edge on Naga sword-daos.

[ausjulius]

Originally Posted by RobT

Ausjulius,

As a woodworker for many years, I find it difficult to accept your contention that, "it is much harder to sharpen maintain and use the single beveled blades than a normal double bevel". Chisels and planes are routinely used and maintained in woodworking. In fact, the single bevel (AKA chisel grind) is used in woodworking far more often than the double bevel. The key to maintaining a sharp chisel, plane or draw knife is to make absolutely certain that the edge of the flat side is absolutely flat. Once that is done, it is simply a matter of making sure that the beveled side meets the flat side at the appropriate angle. There is an abundance of online information about how to get this done for Western as well as Eastern chisels and planes. I will also add that a chisel grind on a knife or short sword allows it to be used as a draw knife which makes it more versatile than a double bevel knife.

Sincerely,
RobT

it is much harder to produce and maintain an single bevel on any item than a double bevel,
this is not my optinon ,
it is just how it works.
you need to keep a single bevel very precice and flat to produce a good effective cut and to sharpen it if on either side even a small secondary bevel develps it will ruin the cutting features of the blade.

a double venel can be lopsided, multi beveled even almost blunt and stull cut. it can cut wood flesh.. ect..
a single bevel once nolonger keen and true becomes totally useless

there is many reaons for this,

it is why you can take a simple machete or parang that is blunt and still swoosh it though foliage or even wood,
if i take a blunt bolo and try this it will just punch off , bind or chip the wood.

this is not at all complicated to observe.
if you are still confused by this.. take a hammer, a slug of ore and a small stone anvil , forge a single beveled true and flat blade of r a single beven,.,. use a hand scraper to true the flat side and plane the angled beven to a razor edge, quench it .. it is a great deal of work to do it well

now do the same thing with a wedge shaped blade adn you can forge without any scraping to a thin edge, rub it unhardened on a stone and then quench it and it will work as good as a finely finished blade.


the single bevelled blades are carefully made with several specialised scraping tools to produce very flat surfaces.
in places where single bevels are common like japan these blades are gorund on machines now
in others places like the philippines and bali they are not unusable and the principals of them are even becomming vague the blades slowly transition into double beveled blades that are asymetrical.. due to lazy low skileld smiths.. very low prices and apathetic customers..
most bolis form cebu or negros ect are almost unusable form the market and even after 1 hour of grinding are sitll just as bad.
the old bolos arer true and flat and crisp like a machine made them..
all scraped for hours carefully by hand before quenching.
you can not just carelessly sharpen a single beveled tool and expect a good effect.