11RPM DisplayThe spindle speed display shows the spindle RPMselected by the speed control knob.Spindle Speed KnobThe SPINDLE SPEED knob is used to set thedesired spindle speed (clockwise increases).Spindle SelectorThe SPINDLE selector switch is used to set thedesired direction of spindle rotation. The REV.(reverse) setting will provide counterclockwiserotation. The FOR. setting will provide clockwiserotation.Drilling Speed ChartA DRILLING SPEED CHART is provided on thefront panel. The chart can be used to select thespeed required for various drill sizes (0.196 inch to1.000 inch — 5 mm to 25 mm) and materials (steel,cast iron, aluminum, and copper). The chartdefines spindle speeds from 300 to 2000 RPM.Depth Indicator — All ModelsRefer to Figure 6.Figure 6A drilling depth indicator is provided on the front ofthe drill head. The indicator can be set for depthsup to 6.5 inches (16.5 mm). A knurled knob isprovided at the front, underside of the head. Beforestarting the motor, set the end of the drill againstthe surface into which the hole is to be drilled. Theindicator is zeroed out using the knurled knob. Themotor is started and the hole drilled until theindicator pointer reaches the desired depth.MaintenanceReplacement of Drive BeltMake sure to disconnectelectrical power to the drill press to avoid thepossibility of inadvertent operation andexposure to potentially lethal voltage levels.Manual Speed Control (Models J-2221VS and J-2223VS)1. Start drill press. Set speed control to highestspeed. Stop drill press.2. Disconnect electrical power by setting drillpress circuit breaker to OFF.3. Remove head cover.4. Remove belt. (With speed control setting at thehighest speed, the belt should be looseenough to remove.)5. Install the replacement belt. Install the headcover.6. Set the drill press circuit breaker ON.7. Operate the drill press to verify correctoperation.Inverter Speed Control (Models J-2232AC and J-2234AC)1. Disconnect electrical power by setting drillpress circuit breaker to OFF.2. Remove pan screws from small cover (aroundcolumn). Remove pan screws and eight boltsfrom head cover.3. Loosen set screw and remove shift lever.4. Remove plastic spindle cup.5. Remove head cover. Leave small cover inplace.6. Disconnect electrical wiring from motorjunction box. Remove motor from mountingplate.7. Remove motor mounting plate.8. Remove three screws from pulley covers(discs). Remove used belt. Install thereplacement belt.9. Install pulley covers and secure with threescrews in each pulley cover.10. Install motor mounting plate. Install motor andconnect electrical wiring (refer to WiringDiagram section for wiring details).11. Install the head cover and secure with panscrews and eight bolts.