6
NOTE: Placing the flat twist-lock cap, provided with the machine
when shipped, over the Airtact port position will also give you an
automatic stroking feature that is designed for stippling or other
operations where multiple hits are desired without the need for
control inputs. This can be used to check for proper handpiece
function. It will immediately give full handpiece power to insure
your connections are correct, if not, find the problem and correct.
SUGGESTIONS FOR AIRTACT TOUCH ELEMENT
At approximately 12 psi, the Airtact will give full power range
for any handpiece. Less than 12 psi, you will limit the range of
power. This can be very useful for shading because you can
lessen the pressure (try 4 or 5 psi) to limit the power for really fine
control. ALWAYS BE AWARE THAT AT LESS THAN 12 PSI you
will NOT have full power.
MAINTENANCE
KEEPING THE HANDPIECE CLEAN
The impact handpiece must be
kept clean for proper operation.
If operation becomes sluggish,
erratic, or fails, cleaning
is needed. Fig. 9 shows
the proper way to clean a
handpiece. Remove the piston
and spring from the handpiece.
Take each, one at a time, and
place in a sheet of WRITING
or COPIER paper.
DO NOT
USE paper towel, tissue, or
newsprint.
Holding it between
your fingers buff and polish off
any dirt or residue. Folding the
paper, use the edge to clean
between the piston grooves
and the spaces between the
spring. To clean the handpiece
inside, take the WRITING or
COPIER paper and twist it to a
point. Insert the paper point into the handpiece and rotate paper
and handpiece against each other. This will buff and polish the
inside clean.
IMPORTANT NOTE: DO NOT LUBRICATE PISTON,
SPRING OR BORE.
Occasionally place a drop of synthetic oil or light grease on the
handpiece chuck threads/jaws. This will extend useful life, and
improve operation. Using a quality light weight silicone grease,
LIGHTLY touch the tip of the tube to your index finger and
RUB/ROLL the o-ring area of the tool holder between your
index finger and thumb. Use this lubricant VERY SPARINGLY
as too much will attract dirt and metal chips.
IMPORTANT NOTE:
DO NOT USE OTHER BRAND 24 Volt
converters - DAMAGE WILL OCCUR to the machine. The power
converter supplied with your machine will accept 120 Volt 60 Hz
or 230 Volt 50 Hz using a PROPERLY grounded electrical circuit.
Older homes and businesses may still have 2 prong receptacles
for electrical connections. These may not allow the 3 prong male
plug to have a proper ground. This unit must have a suitable
ground to prevent damage to the electronic components. If in
doubt, consult a qualified electrician. Use the supplied adapter to
convert the power supply for use with the 230 Volt 50 Hz voltage.
The power converter supplied with your machine will accept 120
Volt or 230 Volt. All that is necessary to convert power supply is
to use the 230 Volt adapter supplied in the accessory box.
ADDITIONAL NOTE: This 24 Volt converter has more output
than the ones supplied with the original GraverMach and
GraverMax SC. DO NOT use these earlier converters with the
GraverMach AT. The additional electrical requirements with
the air solenoid valve may cause other converters to fail or
cause damage to this unit.
If replacement of the power converter is required, use only
part #024-121.
IMPORTANT NOTICES
GRS PROGRESSIVE FOOT CONTROL OWNERS
If you would like to use your GRS Progressive Foot Control
(#004-519PRO) with your GraverMach AT go right ahead, it will
work fine. Attach the foot control throttle to the quick connect
fitting on the back of the machine.
GRS 850 ROTARY HANDPIECE
Refer to the GRS 850 operating instructions for routine
maintenance of the rotary handpiece.
NOTE: Do not exceed
32-35 psi when using.
THROTTLE
The throttle should require little maintenance. It should be
cleaned periodically. OILING: Periodically place a drop of oil on
the throttle hinges. Keep the floor clean and when you sweep or
vacuum, place foot throttle on your bench or chair.
AIR SYSTEM
If large amounts of water and contaminants are in the air supply
to the unit, more frequent attention must be given to the unit
filter. The bowl must be drained frequently to prevent water from
entering the rotary valve, hoses, handpiece, etc. In addition,
the filter element must be cleaned and/or replaced frequently. If
moisture is noted in the handpiece or throttle hoses, shut the unit
down immediately and drain the filter bowl.
Then proceed as follows:
1. Disassemble and clean impact handpiece(s) and reassemble.
2. Reduce pressure setting to 10 psi and turn unit ON to purge
moisture from valves, hoses, etc.
3. Located on the lower back of the machine (Fig. 1-U) is
the drain plug to the internal air reservoir. Using a 3/16"
hex wrench remove the plug and drain any moisture from
reservoir. Replace drain plug. Before using machine again,
figure out where the moisture came from and fix the problem.
It may require an additional filter(s) or water trap in the line.
ROTARY VALVE
The rotary valve is lubricated by air passing through it. Additional
lubrication is not required or recommended. DO NOT RUN
ELECTRICAL SYSTEM UNLESS AIR SUPPLY IS TURNED ON.
A
B
Fig. 9 • CLEANING
A. Writing or copier paper
B. Piston and spring
A
