Delta 31-481 Operations Instructions download pdf (Page 14)

OPERATING TIPS

STOCK FEEDING ANGLE

Some pieces, because of their dimensions, will need

to be fed into the machine at a 90-degree angle

(perpendicular to the drums). However, even a slight

offset angle of the stock will provide for more effective

stock removal. The optimum feeding angle is about

60-degrees. Angling the workpiece for stock removal

provides other advantages, such as less loading of

certain areas of the drums due to glue lines or mineral

streaks in the stock, more even wear of abrasive strips,

potentially faster feed rates, and lighter loads on the

motor. For the best final finish, however, the stock

should be fed with the grain on the final one or two

passes.

MULTIPLE-PIECE SANDING

When sanding multiple pieces simultaneously, make

sure to stagger (step) the pieces across the width of

the feed belt. Multiple pieces should also be of similar

thickness and this helps to ensure consistent contact

with the pressure rollers.

SANDING FACE FRAMES AND

RAISED PANEL DOORS

It is important to have the proper abrasive contact

when doing this type of sanding. If the machine is set

to take an excessive depth of cut, the result can be a

gouge or dip as the drum goes from sanding the rails

at full width to sanding just a few inches of width of the

stiles.

EDGE SANDING

When edge sanding, the sander will mimic the opposite

edge of the stock which is lying on the feed belt.

Because of this, it is important for the stock edge to

have been ripped at the proper angle to the face before

the sanding process. When edge sanding small stock,

clamp several pieces together to prevent them from

slipping on the feed belt.

The abrasive material you choose will have a

substantial effect on the performance of your sander.

Variations in paper type, weight, coating and durability

all contribute to achieving your desired finish.

As with any sanding operation, first begin sanding

with a coarser grit, depending on the roughness of

the stock or the amount of stock to be removed. Then

progressively work toward finer grits. This means if you

are using two different grits on your 31-481 Dual Drum

Sander, the coarser grit should always be placed on

the front drum.

The amount of stock to be removed is a major

consideration when initially choosing the grit grade.

Grits 36 and 60 are primarily designed for stock

removal; grits over 100 are primarily finishing grits

designed to remove the scratch pattern from the

previous grit used.

For best results, never skip more than one grit grade

when progressing through a sanding sequence.

For fine work, such as furniture, try not to skip any

grit grades during the sanding process. In general,

premium quality abrasives will produce a better finish

with a less noticeable scratch pattern.

CAUTION: Grits that are too fine can sometimes

burnish the wood and leave a glossy surface which will

not accept stains evenly. This will vary by type of wood.

Oak, for example, is susceptible to burnishing because

of its open pores.

SELECTING THE PROPER ABRASIVES

READY-TO-CUT ABRASIVE

STRIPS

DESCRIPTION NORMAL USE

60 Grit Sandpaper surfacing and dimensioning

boards, trueing warped

boards

80 Grit Sandpaper surfacing, light dimensioning,

removing planer ripples

120 Grit Sandpaper light surfacing, minimal stock

removal

150 Grit Sandpaper finish sanding, minimal stock

removal

180 Grit Sandpaper finish sanding only, not for

stock removal

220 Grit Sandpaper finish sanding only, not for

stock removal.

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Delta 31-481 Operations Instructions Page 14

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