Milwaukee MK-Manta I owner manual Drilling Speeds, Drilling Pressure and the Ammeter Water Supply

Drilling Speeds

Manufacturer	Model #	AMP	Volts	Speed(RPM)	Suggested Dia. in
					Medium Aggregate
Eibenstock	EBM	20	120	Low – 270	Low – 4”
	300/3 P			Medium – 700	Medium – 2”-6”
				High – 1250	High – 3/4”-4”
Milwaukee	4004	20	120	Low – 300	Low –	4”
				High – 600	High – 14”
Milwaukee	4090	15	120	Low – 375	Low –	5”-8”
				High – 750	High – 2 1/2”-5”
Milwaukee	4094	20	120	Low – 450	Low –	6”-10”
				High – 900	High – 2”-6”
Milwaukee	4096	20	120	Low – 450	Low –	6”-10”
				High – 900	High – 2”-6”
Milwaukee	4097-20	15	120	Low – 500	Low –	1 1/4”
				High – 1000	High – 5”

LOW

HIGH

Drilling Pressure and the Ammeter

A	S
	MP

15

18

20

Water Supply

The MK-Manta I will operate in either a high or low gear speed. This speed combined with applied pressure provides the cutting action for the core bit. Speed selection and pressure are determined by hardness of material, aggregate size and grade of diamond core bit. Generally, harder material and larger aggregates require more speed and pressure. Use low speed for large diameter bits and high speed for small diameter bits. Changing of the speeds is accomplished by using the speed shift lever built into the gear case.

Notice: Change the gears only when the motor is off.

All building materials and work surfaces are composed of aggregate of various size. Aggregates are materials such as gravel or crushed stone. The size of the grains and the hardness of the material affects the speed of drilling. Most building materials contain some type of steel reinforcements. All MK bits are designed to cut through these types of reinforcing steel. However, bits should never be used for drilling solid steel plates. Proper selection of the diamond core bit should be based on material to be drilled and performance requirements.

Steady, even pressure assures accurate holes and longer bit life. Always maintain consistent pressure so that the bit is constantly cutting.

Notice: Too much pressure will damage the bit and motor. Too little pressure will glaze over the diamonds, reducing cutting efficiency and prematurely wearing the bit. The ammeter is the gauge on the Control Box. It provides pressure feedback information during drilling, allowing the operator to help prevent motor overload and premature bit wear. The green area is the operating range, and the red area is the overload range. Generally, the operator should keep the ammeter needle in the upper area of the operating range for large diameter bits, and in the lower green area for small diameter bits. If the bit contacts steel reinforcing rods, the needle on the ammeter may jump slightly showing a heavier load. If this occurs, do not decrease pressure or you may damage the diamonds. The Manta may be operated with the ammeter needle into the red area for the short period of time that it takes to cut through a steel rod.

An adequate supply of clean water is necessary for drilling. Connect the water supply hose to the hose fitting on the output of core drill motor. Take precautions that the water supply will not be interrupted during the drilling operations.

Notice: If a bit is run dry it can be ruined in a few seconds.

MANTA I Revision 03/05, Effective Date March 2, 2005 9