On 2/16/2014 1:54 PM, Tdacon wrote:
When the router bit manufacturers refers to a spiral-cut router bit as
up-cut or down-cut, are they consistently speaking with reference to the
router base? Or are they assuming a router-table orientation as opposed
to a hand-held router?

The ambiguity being, of course, that a router bit that cuts away from
the router is down-cut when the router is being hand-held, and up-cut if
the router is mounted under a router table.

Tom
Upcut is cutting toward the router
Downcut is away from the router.

Upcut mostly for deep mortise cuts.
Downcut mostly for shallow cuts to prevent splintering.


--
Jeff