Changing Spindle Speed - Grizzly T33959 Owner's Manual

15" & 17" variable-speed drill presses
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Changing Spindle
Speed
Spindle Speeds
T33959 .......................................550–3500 RPM
T33960 ...................... 200–880, 800–3400 RPM
T33961 .......................200–720, 700–2200 RPM

Changing Spindle Speed

For the Model T33959, adjusting the speed is as
simple as moving the spindle speed lever until the
digital readout displays the desired speed (see
Figure 38).
Spindle
Speed
Lever
Figure 38. Location of spindle speed lever and
digital readout.
Pull the spindle speed lever forward to increase
spindle speed. Push the lever backward to
decrease spindle speed.
Note: Spindle speed lever should only be adjust-
ed when spindle is running.
The speed of the Model T33960 and Model
T33961 is adjusted the same way, but these mod-
els are also equipped with an extra pulley and
V-belt to achieve two separate speed ranges: low
and high. Refer to the following section to change
the speed range.
Model T33959/60/61 (Mfd. Since 08/23)
Changing Spindle Speed Range
(T33960/T33961 Only)
The speed range of the Model T33960/T33961 is
determined by how the drive belt is positioned on
the idler and motor pulleys (see Figure 39).
Spindle
Figure 39. Location of drive belt and speed
Speed
Digital
Readout
The low speed range is obtained when the drive
belt is positioned on the upper pulley sheaves,
and the high speed range is obtained when
the drive belt is positioned on the lower pulley
sheaves, as shown in Figure 40.
Idler Pulley
pulleys (T33961 shown).
LOW
Idler Pulley
LOW
T33960: 200–880 RPM
T33961: 200–720 RPM
HIGH
Idler Pulley
HIGH
T33960: 800–3400 RPM
T33961: 700–2200 RPM
Figure 40. Belt configuration chart.
Motor
Pulley
Drive
Belt
Motor Pulley
Motor Pulley
-31-

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This manual is also suitable for:

T33960T33961

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