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Tip
#26
Drill Press
(continued)
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Pg. 1-3, Pg
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16-18, Pg
19-21, Pg 22-24
Drill
Press Speeds
Before
you begin any drill press operation, set the Mark V to run
at the correct speed. To do this: turn the machine on, turn
the speed dial to the correct speed and let the machine come
up to speed.
The operating
speeds for drilling are determined by the size of the hole
you want to drill and the material you're drilling. Generally,
you can use faster speeds with softer woods or smaller holes.
Use slower speeds as the materials get harder or the holes
get bigger.
To a lesser
extent, the speed will also be determined by the type of drill
bit you use. For example, twist bits will work better in wood
at higher speeds. Spade bits must be used at slow speeds.
Forstner bits must always be used at very slow speeds.
To help
determine the right speed for the job, refer to Table 7-1.
This table is intended as a general guide when using brad-point
bits and twist bits. If you use other bits, follow the manufacturer's
recommendations. Note: A good rule of thumb is: The smaller
the hole and the softer the material, the faster you can run
the drill. But don't drill too fast or you may burn the wood
and ruin the bit.
| Table
7-1: Drill Press Speed Chart |
| Size
of Hole |
Hardwood |
Softwood |
| 1/4"
and less |
H
(1600 RPM) |
I
(1750 RPM) |
| 1/4"
to 1/2" |
F
(1300 RPM) |
G
(1450 RPM) |
| 1/2"
to 3/4" |
D
(1050 RPM) |
E
(1150 RPM) |
| 3/4"
to 1" |
B
(850 RPM) |
C
(950 RPM) |
| Over
1" |
SLOW
(700 RPM) |
A
(750 RPM) |
| Boring
metals (twist bits only) -- Slow (700 RPM) |
| Note:
These speeds are for 60 hz. operations. |
Continue
to Laying Out the Work
Back to Drill Press Safety
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