Jet ghd-20 ユーザーズマニュアル

 

11 

1.  Unplug machine from the power source. 
2.  Raise the table until it is about seven inches 

below the chuck. 

3.  Place a piece of scrap wood on the table, 

and lower quill (A, Fig. 9) using the downfeed 
handle. 

4.  Rotate spindle to align the keyhole in the 

spindle with the keyhole in the quill. 

5.  Insert the drift key (B, Fig. 9) into the aligned 

slots and tap lightly. The chuck and arbor 
assembly should fall from the spindle. 

 

To drill multiple holes at the same preset depth, 
use the depth stop: 

1.  Use a pencil to mark the depth the bit will drill 

into the workpiece. 

2.  With the drill bit in the chuck, lower downfeed 

handle to advance bit to your mark (A, Fig. 
10). 

3.  With your other hand, advance the lock nuts 

(B, Fig. 10) on the depth stop rod until they 
are snug to the seat (C, Fig. 10). 

4.  The drill bit will now advance to this point. 
5.  To release, advance the nuts counter-

clockwise to the top of the depth stop. 

A spindle speed and pulley/belt arrangement chart 
is found on the inside of the pulley cover (D, 
Fig. 11), also shown in Figure 12. Refer to this 
chart whenever changing speeds. 

8.  To change spindle speeds: 

1.  Unplug the machine from the power source. 
2.  Loosen two bar knobs (E, Fig. 11) found on 

each side of the head assembly.  

3.  Rotate the tension adjuster clockwise 

(F, Fig. 11) to bring the motor base as close 
to the head as possible. 

4.  For desired speed, change the location of 

belts per pulley/belt arrangement chart.  

5.  Rotate the tension adjuster counterclockwise 

(F. Fig. 11) to tension the belts. 

6.  Tighten two bar knobs (E, Fig. 11).  Belts are 

properly tensioned when finger and thumb 
pressure midway between the two pulleys 
causes approximately ½” deflection.