UT9935
2
Recoilless Air Scribe
Installation
The UT9935 Recoilless Air Scribe is designed to operate with 90 PSIG.
Lower pressure (below 90 PSIG) will reduce performance of the tool
while higher air pressure (over 90 PSIG) raises the performance of the
tool beyond its rated capacity and could cause serious damage to
tool and operator.
Always use clean dry air. Excessive moisture and dirt will greatly
reduce the life of any air tool. We recommend the installation of an
in-line filter and regulator as close to the tool as possible.
A 1/4" air hose is required up to a length of 8 ft. If more length is
required, a 3/8" air hose should be connected to the 1/4" hose to
ensure the tool has the necessary air supply. Be sure all hoses and
fitting are the correct size and tightly secured.
Lubrication
This tool does not require lubrication for normal use. However, if the
operating environment and conditions warrant, small amounts of oil
may be necessary to clean the tool of deposits and foreign objects
from a dirty air supply. Use Marvel Air Tool Oil or any other high
grade turbine oil containing moisture absorbents, rust inhibitors,
metal wetting agents and an EP (extreme pressure) additive.
Use care during use
Guide tool over surface. Do not use excessive force while engraving.
Operators may have to acquaint themselves with the unique operat-
ing characteristics of this tool.
Figure 2
Figure 3
Operation
This tool operates slightly different than traditional pneumatic
scribes. There are no benefits gained by using excessive force. Let
the tool do the work. The black grip also serves as the throttle. Ro-
tating the grip clockwise so it moves higher up on the housing (see
figure 1) will start the tool. The scribe will reach full power before
the grip comes to a stop. DO NOT over rotate! Rotating the opposite
direction will decrease the power until the engraver stops. Hold the
engraver at a slight angle to the work surface, the same as you would
an ink pen.
Replacement of Tip
Refer to the parts list exploded view and the figures below while
replacing the tip.
1. Separate the grip (Ref. No. 5) from the housing (Ref. No. 12) by
unscrewing it counter-clockwise.
2. Turn the grip (Ref. No. 5) upside down and tap it gently against a
workbench to remove the actuator (Ref. No. 7).
3. Push the bit firmly against some wood to slide the internal parts
a few millimeters up into the grip. See figure 2.
4. A wire tool is included (1.5 mm diam.) with your replacement
bit. Using figure 3 for reference, use wire to grab rubber sleeve
(Ref. No. 6) and gently pull out of grip.
5. Now the entire bit assembly (Ref. Nos. 1, 2, 3, & 4) may be re-
moved easily.
6. Pull out old bit and replace it. Check that bit is flush with spring
(Ref. No. 2) and with the bit guide (Ref. No. 4) . Place assembly
into grip.
7. Slide sleeve (Ref. No. 6) back into grip and push down until it
rests on the lip inside the grip.
8. Slide the actuator (Ref. No. 7) into the grip and twist back onto
housing (Ref. No. 12).
Figure 1
