"Lloyd E. Sponenburgh" lloydspinsidemindspring.com wrote in message
. 3.70...
"Steve W." fired this volley in news:B_iBp.10733
:

I have used just about every saw out there. From plain circular saws
through the K-12 and our carbide toothed chain saws.
The twin does as well or better for the tasks we use it for than the
others in a lighter and easier to handle package.

What I don't understand is this:

Even with a carbide blade, running a blade backwards into the work dulls
it quickly -- it rounds over the cutting edge. With that contraption,
one blade is ALWAYS cutting backwards. Just the friction heating alone
should kill blades quickly.

Don't confuse running a blade backwards (as in installing it backwards in a
table saw, like Ed H referred to in my dual saw thread), and cutting in
climb. In milling, many machinists prefer to cut in climb, depending
depending.

When you plunge cut with a dualsaw, both blades are essentially cutting
conventionally.
But as soon as you move in one direction, one is cutting in climb, and one
is cutting conventionally.
So really, there are TWO cuts proceeding simultaneously.

For what net purpose? I don't really know, other than being the net effect
of cutting with one blade twice as fine as either of the dual saw blades.
Iow, if you put in a sufficiently fine blade in a reg circular saw, you
shouldn't notice any diff ito of grabbing, sparks, etc.
--
EA



LLoyd