MK 500 Rotary Head
Description
Fitted with a worm and wheel gear totally enclosed in an oil bath case, the Dando MK 500 incorporates a 150mm I.D. hollow spindle mounted on taper roller bearings. The head can then be powered by a single piston motor providing controlled rotation and torque in forward or reverse.
Specification
With reference to our 24 tonne Rigs, Dando Drilling use a valve with a 140lt slice (i.e.70lt motor) and pressure at 315 bar (4568 PSI). Based on this and with a hydraulic piston motor you will see the following speed and torque:
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20:1 Ratio
Maximum RPM 200 @ 3380 Nm (35cc/rev)
Maximum Torque 7725 Nm @ 87 RPM (80cc/rev)
15:1 Ratio
Maximum RPM 266 @ 2534 Nm (35cc/rev)
Maximum Torque 5793 Nm @ 116 RPM (80cc/rev)
12 ½:1 Ratio
Maximum RPM 319 @ 2112 Nm (35cc/rev)
Maximum Torque 4828 Nm @ 139 RPM (80cc/rev)
10:1 Ratio
Maximum RPM 400 @ 1690 Nm (35cc/rev)
Maximum Torque 3862 Nm @ 175 RPM (80cc/rev)
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Please note- These are the results when fitted to a Dando type circuit and not the actual performance that the Rotary head and hydraulic motors are capable of. The piston motor can run with a pressure of 420 bar (6090PSI) and an RPM of 5000, therefore results will vary depending on your hydraulic capability.
Single Gear Motor Arrangement
The torque advised below is a max because of the pressure limitation of the motor and the speed is based on 140 Lt.
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10: 1 Ratio
Maximum RPM 190 @ 2305 Nm
Maximum Torque 5028 Nm @ 50 RPM
12 ½: 1 Ratio
Maximum RPM152 @ 2881 Nm
Maximum Torque 6285 Nm @ 40 RPM
20: 1 Ratio
Maximum RPM 95 @ 4068 Nm
Maximum Torque 9492 Nm @ 25 RPM
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Please note- The 3” Gear motor is limited to 2500psi and is approximately 0.2245 Lt/rev. The motor is capable of 2000 RPM @ 365 Lt/min and performance can vary infinitely depending on the hydraulic supply system.
GENERAL SPECIFICATION
Estimated Shipping Weight: 438kg
Gear Oil: 8 litres EP Gear Oil Grade 80/90
Hydraulic Oil: Shell Tellus 46 or equivalent
Maximum Pullback: 24 tons.
Estimated Shipping Dimensions: 1m x 0.8m x .7m
