MODEL IDENTIFICATION
TABLE 2
The ARO@model 8670-( )
The models 8670-( ) are available with either a
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
7 | 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.
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.
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
The function of the timing valve is to regulate the time lapse be- tween the end of the drilling stroke and the retract stroke. The tim- 2
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
The unit may be shifted to the retract stroke at any time during the drilling cycle by manually depressing the retract valve, located at