3
MACHINE SETUP
AIR SUPPLY REQUIREMENTS
GraverMach AT requires 1.4 CFM (40 liters/min.) at a minimum
45 psi (3.1 bar). Maximum input is 125 psi (8.6 bar). We
encourage reducing the air pressure from the compressor with a
regulator to 45~60psi (3.1~4.1 bar) as this ensures a stable air
pressure supply. The compressed air must be clean, dry, and oil
free. The filter supplied with each unit is a final filter and is not
capable of removing large amounts of water, oil, or contaminants.
If the air supply has excessive water, oil, or contaminants,
an additional filter/water trap and coalescing oil removal
filter must be installed ahead of the unit. Oil or water
contamination is NOT covered by the 2 year warranty.
Never add oil to the compressed air for the GraverMach AT.
Oil can damage internal parts and cause erratic handpiece
operation. If your compressor requires oil YOU MUST use a
Coalescing Oil Filter (#004-579 or equivalent) to ensure this
oil does not contaminate your compressed air.
INITIAL SETUP
Decide where you want to place the machine on your bench
and where you would like the air filter located. Make its location
readily accessible so it is easy to drain water from the bowl
daily. You may attach the air filter to your machine, workbench,
or wherever you desire. Here we show it attached to the back
right side of the machine. Remove the screw at this location and
place the screw through the key hole opening in the filter bracket.
Tighten the screw to secure bracket. The bottom screw in the
bracket will position into the slot to keep the filter from twisting.
HOSE CONNECTION
If push-to-connect fittings are new to you, they are amazing. With
the AIR PRESSURE TURNED OFF, simply insert the hose all the
way into the fitting opening –– it stays attached. To disconnect,
press in on the orange ring while gently pulling the hose out.
Locate the air input fitting on
the air filter (Fig. 2-C). It is
identified on the air filter with
the marking “N
⇧
”. Connect
your 1/4" OD (6.35mm) air
supply hose directly to the
push-to-connect fitting. If your
air supply hose is larger than
1/4" OD you have two options.
Use a reducer (not supplied)
and step the air hose size
down to a 1/4" OD (6,35mm)
or replace the push-to-connect
fitting with the included barbed
fitting and attach air supply
hose.
Locate the 6' (1.82m) air hose
(#044-069) and cut a 5 1/2"
(139mm) piece from it.
NOTE:
This is if you are going to locate
the Air Filter as described
above. If locating the filter in a
different place, cut the 6' hose
to fit as needed.
Connect the
5 1/2" hose to the air outlet on
the air filter (opposite the air
input). Connect the other end
of that hose into the fitting on the back of the machine marked
AIR INPUT (Fig. 3-C). Use these same connections no matter
where you locate the filter.
CONNECT FOOT THROTTLE
Place the foot throttle on the floor in a convenient position. Run
the hose to the back of the machine (Fig. 3). If you need to snake
the hose through an opening on your bench, make sure the hose
is not pinched or kinked. Connect the hose from the foot throttle
to the push-to-connect fitting above the label marked THROTTLE
CONNECTION (Fig. 3-D).
NOTE: It is normal to hear air leaking when you depress the foot
throttle, this is what activates the handpiece.
CONNECT HANDPIECES
There are two fittings to attach standard impact handpieces
(Fig. 3-A). Decide which handpiece you want in positions 1 and
2. Connect the handpiece hose to the push-to-connect fitting
simply by pushing the hose inside the orange fitting. A selector
knob above the connections lets you select which impact
handpiece you want to use, 1 or 2 (Fig. 1-G). If you are using the
Airtact handpiece, the twist-to-lock connections above the main
air fittings are conveniently placed for easy hook-up (Fig. 3-B).
NOTE: Make sure selector knob is turned until it stops, either
direction.
The auxiliary outlet is a straight flow air supply that is
limited to 40 psi (2.7 bar) and is located at the rear of the unit
(Fig. 3-E). This is the connection for a rotary handpiece or other
pneumatic tool. The knob is a twist open-twist close valve on the
face of the machine (Fig. 1-L).
USING AN AIR DRIVEN ROTARY HANDPIECE
DO NOT EXCEED 35 psi (2.8 bar) when using the 850 Rotary
Handpiece.
CONNECT ELECTRICAL POWER
IMPORTANT: The ROTARY VALVE is lubricated by air
passing through it. DO NOT RUN ELECTRICAL SYSTEM
UNLESS AIR SYSTEM IS ON.
Connect the electrical power cord
into the 24 Volt converter box. Plug the converter cord into the
jack on the back of the machine (FIG. 3-F&G).
A. Connections for
regular handpieces
B. Connections for
Airtact Handpieces
C. Connect filter air output
to machine air input
D. Connect foot throttle hose
E. Connect to rotary handpiece
F. Connect 24 Volt power supply
G. 24 Volt converter (#022-987)
A
B
C
D
Fig. 3 • Hose Connection
C
E
F
G
7
9
6
10
8
11
A
A
D
E
C
A. To mount air filter, remove this
screw and replace with
10-32 x 1/2” socket head screw
included in accessory bag.
B. #044-229 black hose, 5.5”
C. Connect air supply to air filter
input fitting “N
”
D. Purge moisture from filter bowl
by turning the knob clockwise,
when viewed from the top, to
open valve
E. Air supply line
B
• Suggested location
for air filter.
Fig. 2
