Grizzly G1126 instruction manual Spindle Speed, ON/OFF and FORWARD/REVERSE Switching

D. SPINDLE SPEED

The Model G1126 features an internally-geared head which offers six speeds, both in forward and reverse. Speed selection levers are located on the front of the mill head. See the chart below for specific spindle speeds in each gear range.

Gear Ranges – Model G1126

Levers	L1	L2	L3	H1	H2	H3
Spindle RPM	60	130	230	450	800	1500

Establishing proper spindle speed is just part of the same complex equation that determines power feed rates. Like we noted before, the equation encompasses a number of variables, including; spin- dle speed, metal hardness, feed rate, cutting depth and cutter type. Because of the complexity of the equations necessary to determine optimum spindle speeds and feed rates, we suggest once again you obtain one of many good machinist’s guides on the market. Community colleges and vocational schools are often good places to obtain informative textbooks which go into the neces- sary mathematics of machining in detail.

REMEMBER: Do not attempt to change gear speeds while the machine is running. Allow all mov- ing parts to come to a full stop before making any adjustments.

CAUTION: Even at low spindle speeds, metal fragments from the cutting process can be expelled by the mill / drill. Always wear ANSI-approved eyewear and protective clothing when operating the Model G1126. Be sure that all observers are safely away from the machine while it is being operat- ed.

E. ON/OFF AND FORWARD/REVERSE SWITCHING

A 3-way toggle switch located on the front of the mill head controls both power and spindle direc- tion. Always make sure the cutter is rotating in the direction required by your cutting tool. While most bits and cutters are designed to operate in a clockwise rotation, some are designed to work coun- terclockwise. Make sure the spindle direction is correct for your application.

CAUTION: Do not reverse the spindle direction while the machine is running. Allow the machine to come to a full stop before changing directions.

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