Jet Tools 720HD - Manual (Page 12)

12
Chuck Extension Adaptor
The provided Chuck Extension Adaptor is used
to lower the chuck for use with after-market
chisels (chisels other than those supplied with
your machine) that may require a spacer due to
varying lengths in shanks.
1. To install the adaptor, first remove the chisel
and auger.
2. It may be necessary to remove the bushing
to provide enough clearance when installing
the chuck and adaptor. If so, loosen the set
screw and remove the bushing.
3. Hold the spindle stationary by placing a
wrench on the flats of the spindle (see
Figure 9). With your other hand, insert the
chuck key into the chuck and use it to twist
the entire chuck, until the chuck releases
from the tapered spindle. Do not allow the
chuck to drop, as it can be damaged.
4. Push the adaptor into the chuck (Figure 9).
Then push this assembly onto the spindle.
5. Re-install the bushing and secure it loosely
with the set screw.
6. Re-install the chisel and auger. See
“Installing Bushing, Chisel and Auger”.
Depth Setting Rod
The depth setting rod (Figure 10) limits the
depth of the stroke.
1. Lower the mortising head until the chisel is
at the desired depth.
2. Loosen the locking handle and slide the
depth rod down until the collar contacts the
block.
3. Tighten the locking handle.
Head Movement
The three handles for head movement
(explained below) are spring loaded, and can be
adjusted to different positions for the
convenience of the operator. Pull up on the
handle close to its hub and rotate it, allowing it
to drop back down onto the pin. See Figure 11.
Make sure the handle re-seats itself properly on
the pin.
Figure 9
Figure 10
Figure 11