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MODEL IDENTIFICATION
TABLE 2
The ARO@ model 8670-( ) self-feed drill is designed to automati-
tally feed to a pre-set depth, trip and return.
The models 8670-( ) are available with either a 1 -1/2” or 3” stroke
length and in five (5) different spindle speeds. The combination of
stroke lengths and free speeds appear as models above.
The models 8670-( ) may be used in single unit or multiple unit
applications.
RETRACT FEED CONTROL VALVE
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TOOL RETRACTED SIGNAL PORT
UARY SUPPLY PORT
EMOTE RETRACT PC
The three basic sections of the model 8670-( ) are arranged for
efficient maintenance. The following is a brief description of the
sections and their functions.
VALVE SECTION
The valve section is composed of a spool valve, timing valve, re-
versing valve, manual start and manual retract valves, retract
feed regulating valve and also houses remote start and remote re-
tract ports, a depth signal and an auxiliary supply port.
The function of the 4-way spool valve is to port air to the piston for
the forward and retract strokes.
ing valve can be adjusted so the unit retracts immediately upon
completion of the drilling stroke or it can be adjusted to delay the
retract stroke anywhere in the range from 0 to approximately
seven (7) seconds.
The function of the reversing valve is to port air to the spool valve,
causing it to shift to the retract stroke position at the completion of
the timing cycle.
The drilling stroke is started by manually actuating the start valve,
located at top of valve housing. The unit will advance the drill to a
pre-set depth and automatically retract to the initial position,
whereupon the unit will stop with all air to the unit shut off.
The function of the timing valve is to regulate the time lapse be-
The unit may be shifted to the retract stroke at any time during the
tween the end of the drilling stroke and the retract stroke. The tim-
drilling cycle by manually depressing the retract valve, located at
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