OK, I'm a little confused. You said it was an "old" planer
but Delta didn't make a 12" in the "old" days. At the risk
of being way off base and thinking that maybe you actually
meant a 13" planer, the real kind, not a lunch box model,
I've pirated some information from Dave Flemming.
Various Settings for Planer Knives and Rollers
Submitted by Dave Fleming
These settings work for all planers, not just Parks.
Lower bed and place DI, Dial Indicator, on center platen
with contactpoint in " UP" position. Find the lowest point
of the knife (cutting circle) and set the dial on zero.
See note **
1. Top Infeed Roll
Move Indicator under top infeed roll and adjust roll .050"
below cutting circle.
Move Indicator under chip breaker and adjust chip breaker
.020" above the cutting circle.
3. Pressure Bar
Move Indicator under the pressure bar and adjust pressure
bar about .002" above cutting circle.
4. Top Out feed Roll
Move Indicator under the top out feed roll and adjust roll
to .020" below the cutting circle.
5. Bottom Rolls
Set DI, Dial Indicator, on center platen with contact point
in "Down" position and set dial at zero.
6.Bottom Infeed Roll
Move Indicator over bottom infeed roll and adjust roll .006"
7. Bottom Out feed Roll
Move Indicator over bottom out feed roll and adjust roll
.006" above platen
Bottom Roll Settings may have to be increased to about .012"
above platen to feed very rough stock.
These settings are based on moving the DI, Dial Indicator,
from side to side to determine the parallelism of the knife
or roller to the platen.
Knife Height For Both Planer and Jointer
Maximum Height of Knife Above Cutter head is .100" for HSS
Maximum Height of Knife Above Cutter head is between .031"
and .039" for TCT knives.
All Settings May Have To Be Adjusted ( +/-) Depending
Upon Machine And Wood Specie Being Machined.
Note: it is best to check the relationship between
the cutterhead itself and the table/platen first just to
make sure they are parallel to each other before proceeding
to set the knives themselves.