On 10/02/2011 06:37 AM, Ralph E Lindberg wrote:
In ,
(Arch) wrote:

Just musing,


I'm too lazy (read have forgotten how) to bother doing the math, but I
wonder how many linear feet of wood a burr scrapes per sec. when it
touches a bowl turning at any reasonable rpm. I doubt a fragile hooked
burr lasts long on a wood-turning scraper, but there's no doubt that a
burr seems to work for a period longer than expected. I wonder if the
effects of a burr that last any time at all are really due to improving
the edge and not the burr.


I figure the burr lasts 10 or maybe 15 seconds, thats all

Anybody ever put a burr on the edge of a reversed ground bevel (on the
concave side) of a gouge (preferably an unused cheap carbon steel
spindle gouge) placed upside down with the wings resting flat on the
tool rest. Should provide a fixed angle of attack and a small point of
contact?? Much safer to do a thought experiment from my armchair and let
somebody else try it ....or not.

I know a demonstrator that advocates something like that. He takes a 2
inch SRG, grinds it to a finger-nail. Then, with the flute down, grinds
a 70 degree bevel. When he is doing the finish cut on a bowl, he puts a
fresh burr on the gouge (only the left side, with the flute faces down).
He keeps the SRG level and cuts at a single point of contact

What's an SRG?

--
Kevin Miller - http://www.alaska.net/~atftb
Juneau, Alaska
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