Choosing Spindle Speed - Grizzly T33903 Owner's Manual

Using Drill Bit Speed Chart
The chart shown in Figure 31 is intended as a
generic guide only. Always follow the manufac-
turer's speed recommendations if provided with
your drill bits, cutters, or hole saws. Exceeding
the recommended speeds may be dangerous to
the operator.
The speeds shown here are intended to get you
started. The optimum speed will always depend
on various factors, including tool diameter, drilling
pressure, material hardness, material quality, and
desired finish.
Often, when drilling materials other than wood,
some type of lubrication is necessary.
T T w w i i s s t t / / B B r r a a d d P P o o i i n n t t D D r r i i l l l l B B i i t t s s
1/16" – 3/16"
13/64" – 3/8"
25/64" – 5/8"
11/16" – 1"
S S p p a a d d e e / / F F o o r r s s t t n n e e r r B B i i t t s s
1/4" – 1/2"
9/16" – 1"
1-1/8" – 1-7/8"
2–3"
H H o o l l e e S S a a w w s s
1/2" – 7/8"
1" – 1-7/8"
2" – 2-7/8"
3" – 3-7/8"
4" – 5"
R R o o s s e e t t t t e e C C u u t t t t e e r r s s
Carbide Insert Type
One-Piece Type
T T e e n n o o n n / / P P l l u u g g C C u u t t t t e e r r s s
3/8" – 1/2"
5/8" – 1"
-28-

Choosing Spindle Speed

S S o o f f t t W W o o o o d d
3000
2000
1500
750
S S o o f f t t W W o o o o d d
2000
1500
1000
500
S S o o f f t t W W o o o o d d
500
400
300
200
100
S S o o f f t t W W o o o o d d
350
1800
S S o o f f t t W W o o o o d d
1200
800
Figure 31. Drill bit speed chart (RPMs).
Lubrication Suggestions
Wood ...........................................................None
Plastics ............................................Soapy Water
Brass ...............................Water-Based Lubricant
Aluminum ..................... Paraffin-Based Lubricant
Mild Steel ............................. Oil-Based Lubricant
Larger bits turning at slower speeds tend
to grab workpiece aggressively. This can
result in operator's hand being pulled into
bit or workpiece being thrown with great
force. Always clamp workpiece to table to
prevent reduce risk of injury.
H H a a r r d d W W o o o o d d P P l l a a s s t t i i c c B B r r a a s s s s
2500 2500 2500
1500 2000 1250
750 1500
500 1000
H H a a r r d d W W o o o o d d P P l l a a s s t t i i c c B B r r a a s s s s
1500
1250
750
350
H H a a r r d d W W o o o o d d P P l l a a s s t t i i c c B B r r a a s s s s
500 600
400 500
300 400
200 300
100 200
H H a a r r d d W W o o o o d d P P l l a a s s t t i i c c B B r r a a s s s s
250
500
H H a a r r d d W W o o o o d d P P l l a a s s t t i i c c B B r r a a s s s s
1000
600
Model T33903/T33904 (Mfd. Since 07/23)
A A l l u u m m i i n n u u m m M M i i l l d d S S t t e e e e l l
3000 2500
2500 1250
750 1500 600
400 1000 350
A A l l u u m m i i n n u u m m M M i i l l d d S S t t e e e e l l
A A l l u u m m i i n n u u m m M M i i l l d d S S t t e e e e l l
600 600 500
500 500 400
400 400 300
300 300 200
200 200 100
A A l l u u m m i i n n u u m m M M i i l l d d S S t t e e e e l l
A A l l u u m m i i n n u u m m M M i i l l d d S S t t e e e e l l