Magnum Industrial MI-81190, Operating Manual

Page: 25 / 44

OPERATIONS (cont.)
UNDESIREBALE RESULTS
NOTE: Rough sawn , bowed, cupped, or twisted stock will take several passes before a smooth
finish is achieved. Apply light downward pressure to this type of stock and take very shallow depth
of cut passes to eliminate stock waste and bowed surfaces. Research proper jointing methods for
imperfect lumber.
If you are getting scalloping (aka chatter marks) on the surface of your stock, this is due to error of the operator feeding
too fast. Slow down your feed speed.
After machining the face of a piece of lumber and you find the stock is thinner on one long edge than the other, the most
likely cause is the infeed table not being parallel with the cutterhead. See the table adjustment procedures in the
Troubleshooting section beginning on page 33 of this manual.
If you find that you are not getting a square edge to an already flat face surface, and the fence is not square to both tables
when checked separately, the tables need to be adjusted to coplanar. See the table adjustment procedures in the
Troubleshooting section beginning on page 33 of this manual.
If both tables are coplanar to each other and parallel with the cutting edges of the inserts on the cutterhead, and you are
not getting a square edge to a flat face surface, go through the fence adjustment procedures beginning on page 19 of this
manual.
After making a few passes on either a single face, or single edge, are you beginning to see a taper on your piece of stock?
That’s normal. The more you continue to run the same face or edge, the worse the taper will be. A jointer can only square
up one face and one edge. It does not have any type of opposite side reference to machine 2 parallel surfaces. There are
videos and write ups on the internet explaining why this happens. You need a planer to create a parallel face surface to
the flat jointed face of your stock and a table saw to rip cut a parallel edge to the jointed edge. This will give you a board
with 4 surfaces that are square to each other and opposite faces that are parallel with each other….aka S4S lumber.
If you are getting either a concave or convex face or edge, this most likely means your tables are not coplanar and need
to be adjusted, or you are applying to much downward pressure on a bowed or cupped board causing the issue. For
table adjustments, see the table adjustment procedures in the Troubleshooting section beginning on page 33 of this
manual.
NOTE: We highly recommend reading articles and watching videos on how to properly machine stock that is warped,
bowed, twisted or cupped, before making table adjustments as undesirable results could just be operator error.