Operation EN Engraving Pen
4© Chicago Pneumatic - 8940176142
Operation
Changing from stylus to chisel
• Unscrew the cylinder sleeve from inlet and cylinder assembly. (Rlght Hand Thread)
• Withdraw inlet and cylinder assembly from sleeve. Avoid damage to "O" ring.
• Get the slylus out of cylinder sleeve.
• Be sure that the two "O" rings are assembled under shoulder of anvil. Drop anvil into cylinder sleeve, small end
down. Shake sleeve until small end of anvil enters hole in bottom of sleeve.
Sharpening the Sylus
Best results are obtained with a diamond wheel mounted on a tool post grinder in a lathe. This is followed by polish-
ing first with a Norton stone No. 37C4006V or equivalent then with carborundum paper No. A935K500 or equiva-
lent to a 10-15 micro finish. I f such facilities are not available, the stylus can be sharpened with No. 19A 60L8V
Norton wheel on a bench grinder.
Sharpen to an included angle of 90 ° with a point diameter of • 005" to . 015" fiat.
The stylus may be sharpened until the turned down portion at the end of the stylus holder is ground off.
This gives a usable length of stylus of approximately 1/4 inch as shown on drawing below .
Hardening Chisel Blanks
A blank chisel is provided for special jobs. It can be heated and formed to any desired shape.
To harden chisel after forming, heat to cherry red and quench in oil. Polish a surface with emery cloth and reheat to a
light straw color.
If heat treating facilities are available, harden by heating to 1550 °F for five minutes, quenching in oil and drawing at
425 ° for one hour. Hardness should be 55- 60 Re.
Operation
To start the tool, turn sleeve valve indicator approximately to the mid-point of the operating range. If necessary, jar
stylus lightly against bench to start piston. After starting, adjust sleeve valve to the operating speed, causing the sty-
lus to make a mark to the desired depth.
The CP9361 Air Scribe is capable of marking material as hard as RC 64. When marking material of this hardness,
the operator is cautioned to regulate the impact of the styLus with the throttle valve so that the stylus makes a legible
mark and no more than this. If the stylus is driven harder, excessive wear and breakage of the stylus point may result
on very hard materials.
