On Sat, 16 Jan 2016 10:03:28 -0600, "Lloyd E. Sponenburgh"
lloydspinsidemindspring.com wrote:

fired this volley in
:

all 1 3/8" deep.


How do you figure to get a 1-3/8" deep slot from a cutter that only has a
5/8" cutting depth?

If you take the cuts in shallow increments, AND you don't have any play
in your spindle, you should be able to get within a half-thou. of the
cutter diameter, or so.

But not that depth!

L
Lay the 1X1 in the vise, with the desired slot vertical. Mill the slot
from the end to the stop-hole. Keep milling bit by bit 'till you
reasch full 5/8" depth for the full 1 3/8" length of the slot. Release
the vise and flip part end to end, reclamp and repeat, cutting from
the other end, untill the depth of cut excedes 3/8" and there is no
more metal in the slot.