Central Machinery 39955, Assembly & Operating Instructions

SKU 39955 

For technical questions, please call 1-800-444-3353. 

Page 11

Running the Drill Press

Step 1) 

Insert the drill into the jaws of the chuck approximately 1”, ensuring that the jaws do not touch 
the flutes of the drill.  Before tightening the Chuck, ensure that the drill is centered within the 
jaws.  

Step 2) 

Make certain that the Table height and position is set so that the drill travel range is sufficient 
for the material to be drilled.

Step 3) 

Make certain that the work piece is securely clamped.  It should be held in a drill vise or 
bolted to the table.  Never hold the material with your bare hands while drilling as this may 
result in severe personal injury.

Step 4) 

If the material is irregularly shaped and can not be laid flat on the table, it should be securely 
blocked and clamped.  Any tilting, twisting or shifting will result not only in a roughly drilled 
hole but also increases the chances of damage to the drill.

Step 5) 

FOR FLAT WORK, lay the piece onto a wooden base and clamp it down firmly against the 
table to prevent it from turning.

Step 6) 

FOR SMALL MATERIALS that cannot be clamped to the table, use a drill press vise.  Make 
sure that the vice is clamped or bolted to the table.

Step 7) 

WHEN DRILLING COMPLETELY THROUGH WOOD, always position a piece of scrap wood 
between the material and the table to prevent splintering on the underside of the material as 
the drill breaks through.  The scrap piece of wood must make contact with the left side of the 
column.  Also, set the depth of the drill so that the drill will not come in contact with the table 
or align the table so that the hole in its center is in line with the drill bit.

Step 8) 

Once the instructions above have been followed, make certain guards are in place and turn 
the machine ON.   

Cutting Speeds

Factors which determine the best speed to use in the drill press operation are:

1) 

Type of material to be drilled

2) 

Size of hole

3) 

Type of drill bit

4) 

Quality of the hole or cut desired.

Generally, the SMALLER THE DRILL BIT the GREATER THE REQUIRED RPM.  In soft material, the speed 
should be higher than for hard metals.  As a guide, the drill speed for a given drill bit size is listed in the chart 
below.

REV 03c