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MK 500 Rotary Head

The Dando MK 500 incorporates a 150mm I.D. hollow spindle mounted on taper roller bearing and is fitted with a worm and wheel gear totally enclosed in an oil bath case.

The head can then be powered by a single piston motor providing controlled rotation and torque in forward or reverse.

General Specifications

  • 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
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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:

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)

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

The torque advised below is a max because of the pressure limitation of the motor and the speed is based on 140 Lt.

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

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.

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