LEMAN PON400 Manual De Instrucciones página 57

wide with this unit because of its open side design. Although you still abrasive sand with
the grain, you do not have to read the grain to prevent tear-out. This is especially
important with thin stock and material with convoluted or mixed grain directions, like bulr,
crotch, and tiger patterns.
Drum sanders exert much less pressure on stock than a thickness planer, giving you the
capability of working with very thin material. You have the ability to sand to veneer
thickness if desired, expanding your woodworking horizons. You can also sand smaller
lengh wood, odd-shaped pieces, and end-grain.
REMOVING LUMBER CUP
The ideal machine for removing cup from luber is a jointer. However, because of the
minimal pressure exerted by the drum sander, it is possible to remove cup, since the
lumber is not compressed flat on feed belt and table. Be patient, this process can take
quite a while deoending on cup depth. Feed the stock into the machine cup crown up
(edges resting on feed belt) and use a coarse grit abrasive. Repeat until the crown is flat.
With one face now flat, flip the board over and sand it flat. Do not be shocked by how
thin the board may become after all cup has been removed.
Board warp and twist will not be remedied by a drum sander, or a planer, for that matter.
Always inspect your lumber for warp and twist before drum sanding since it is prone tp
hanging-up in the machine, shorter length lumber in this condition is especially
troublesome.
PLAN YOUR WORK IN ADVANCE
Planning your drum sanding operations in advance will minimize setups, work time, and
frustration level. Group material to be sanded by thickness and grit requirements and
work through each required sanding grit starting with the thickest material through the
thinnest, then change over to next finer grit and begin the process again.
We suggest that you experiment with the varions sanding grits and wood species to
determine the results you can expect before ruining project material. With new set-ups,
always test with scrap lumber before sanding your project material.
WOOD SPECIES TO BE CAUTIOUS WITH
Highly resinous species will tend to quickly clog (load-up) abrasives and in many cases
abrasive loading cannot be removed with belt cleaning sticks.The most notorious
abrasive loaders are some common pine species. It is nearly impossible to clear the
abrasive of the pitch, sap sawdust combination.
Be aware of species that have toxic properties, such as members of the rosewoodfamily
(i.e.cocobola). Despite dust control, you may inhale small airborne particulate or suffer
allergic reactions through handing of stock. Wear a mask and gloves for extra protection.
MS3140 DRUM SANDER
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