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Multiquip CDM1H Hand-Held Core Drill Motor

for use with core bits up to 3 Inches in diameter.
 
Features:
115 Volt Electric Motor
2200 RPM no-load
Slip-Clutch
Overload Protection
$459.95
 
Includes:
5/8-11" Adapter & Wrench
1-1/4"-7 Adapter & Wrench
Water Kit for wet drilling.
16 Foot Cord Length
Plastic Molded Carrying Case
   
Voltage
Amperage
Speed (RPMs)
Weight
115
12
2200
9 lbs.

Diamond Products CB500 Hand-Held Core Drill Motor

for use with core bits up to 3 Inches in diameter.
for use with core bits up to 6 inches when rig-mounted.
 
Features:
1300 Watt
115 Volt Electric Motor
2-Speed Gear Box
1100 RPM / 2200 RPM
$719.95
 
Includes:
5/8-11" Spindle
1-1/4"-7 Adapter & Wrench
Water Hose Connection
16" cord length
Plastic Molded Carrying Case
   
Voltage
Amperage
Speed (RPMs)
Weight
115
9
1100 / 2200
13 lbs.

Weka DK12 Hand-Held Core Drill Motor

for use with core bits up to 3 Inches in diameter.
for use with core bits up to 6 inches when rig-mounted.
 
Features:
Electric Motor
970 / 2330 / 4400 RPM
P/N 4244017
$1,469.95
 
Includes:
5/8-11" Spindle
1-1/4"-7 Spindle
Thermal Overload Protedtion
Water Connection
Two Leveling Bubbles
Plastic Molded Carrying Case
   
Voltage
Amperage
Speed (RPMs)
Weight
110
14
970 / 2330 / 4400
14

Weka DK16 Hand-Held Core Drill Motor

for use with core bits up to 3 Inches in diameter.
for use with core bits up to 6 inches when rig-mounted.
 
Features:
Electric Motor
970 / 2330 / 4400 RPM
P/N 4244067
$1,916.00
 
Includes:
5/8-11" Spindle
1-1/4"-7 Spindle
Electronic Overload Protedtion
Water Connection
Two Leveling Bubbles
Plastic Molded Carrying Case
   
Voltage
Amperage
Speed (RPMs)
Weight
110
18
970 / 2330 / 4400
14

Milwaukee 4005 Rig-Mount Core Drill Motor

for use with a drill rig & core bits up to 7 Inches in diameter.
Best Results for Core Bit Sizes: 4 to 6-1/2 inches.
 
Features:
Electric Motor
600 / 1200 RPM
loaded
$1,519.20
 
Includes:
1-1/4"-7 Spindle
On/Off Switch included on this model.
Slip Clutch
Water Connection
Open-End Wrench
   
Voltage
Amperage
Speed (RPM)
115
20
600 / 1200 Loaded RPM

Milwaukee 4097 Rig-Mount Core Drill Motor

for use with a drill rig & core bits up to 10 Inches in diameter.
Best Results for Core Bit Sizes: 2-3/8 to 8 inches.
 
Features:
Electric Motor
500 / 1000 RPM
loaded
$1,454.40
 
Includes:
1-1/4"-7 Spindle
On/Off Switch included on this model.
Slip Clutch
Water Connection
Open-End Wrench
   
Voltage
Amperage
Speed (RPM)
115
15
500 / 1000 Loaded RPM

Milwaukee 4096 Rig-Mount Core Drill Motor

for use with a drill rig & core bits up to 12 Inches in diameter.
Best Results for Core Bit Sizes: 2-5/8 to 9 inches.
 
Features:
Electric Motor
450 / 900 RPM
loaded
$1,519.20
 
Includes:
1-1/4"-7 Spindle
On/Off Switch included on this model.
Slip Clutch
Water Connection
Open-End Wrench
   
Voltage
Amperage
Speed (RPM)
115
20
450 / 900 Loaded RPM

Core Bore CB748 Rig-Mount Core Drill Motor

for use with a drill rig & core bits up to 14 Inches in diameter.
Best Results for Core Bit Sizes: 2-3/4 to 10 inches.
 
Features:
Electric Motor
350 / 900 RPM
loaded
$1,779.95
 
Includes:
1-1/4"-7 Spindle
On/Off Switch included on this model.
Slip Clutch
Water Connection
Open-End Wrench
   
Voltage
Amperage
Speed (RPM)
115
20
350 / 900 Loaded RPM

Core Bore CB700 Rig-Mount Core Drill Motor

for use with a drill rig & core bits up to 14 Inches in diameter.
Best Results for Core Bit Sizes: 3-1/2 to 12 inches.
 
Features:
Electric Motor
210 / 480 RPM
loaded
$1,082.40
 
Includes:
1-1/4"-7 Spindle
On/Off Switch included on this model.
Slip Clutch
Water Connection
Open-End Wrench
   
Voltage
Amperage
Speed (RPM)
120
20
210 / 480 Loaded RPM

Milwaukee 4004 Rig-Mount Core Drill Motor

for use with a drill rig & core bits up to 14 Inches in diameter.
Best Results for Core Bit Sizes: 4 to 14 inches.
 
Features:
Electric Motor
300 / 600 RPM
loaded
$1,519.20
 
Includes:
1-1/4"-7 Spindle
On/Off Switch included on this model.
Slip Clutch
Water Connection
Open-End Wrench
   
Voltage
Amperage
Speed (RPM)
115
20
300 / 600 Loaded RPM

Factors that affect Core Drill Motor
performance and your profit margin

Speed
(RPM) - If the speed is too high the bit will polish. If the speed is too low the job will take too long. You will know if the bit is "Polished" or "Glazed" when it stops cutting, you have segments left, and you don't see exposed diamonds. To open up the diamonds try drilling in soft abrasive material like a cinder block. Be careful to not drill very much as you will be wasting diamonds.
Power
Necessary to maintain the proper cutting speed. Efficient cutting means keeping the bit at the right speed.
Water
Not too little and not too much. The right amount removes slurry and keeps the cut clean. Slurry water should look like "Coffee with cream"
Aggregate
You can't see it until you're done, but a good driller can feel the right speed and pressure to cut varying types of aggregate.
Steel
Slows down the cutting process. Maintaining drill motor speed is important. Don't push the bit too hard. Maintain even speed with even pressure.
Bond Specs
Too hard and it takes too long. Too soft and it costs too much money. Remember Hard bond for cutting soft abrasive materials, soft bond for cutting hard materials. "Hard on hard" won't cut, and "soft on soft" won't last.
Proper Alignment
Necessary for good bit life. This means the rig must be properly anchored. A rig can be anchored with concrete anchors, vacuum or a post jack.
Standing on the rig is DANGEROUS and not acceptable
Core Rig Maintenance
Performance, speed and bit life will mean little if your rig has bad shims, bearing and hold down devices.