Slewing drive power
QCB Slewing Drives can be powered by hydraulic, electric or even air-powered motors.
QCB can specify and supply a wide range of hydraulic, electric and servo motors.
Worm gear slew drives with efficiency <50% are generally self-locking, but this can be cancelled by external excitation or vibration and should not be relied upon to act as a brake. QCB recommends that all drives are fitted with braked motors.
Starting torque can be higher than operating torque (due to stiction in the gearing and seals) and we recommend adding 20% to your calculations to compensate for this.
An application factor ranging from 1.1 to 2.0 should also be applied depending on the type of rotatory movement, duty cycle and shock loading.
Hydraulic power
Most QCB Slewing Drives are imported in right hand drive form to accept an SAE 2-bolt hydraulic 25mm output motor. There are exceptions, but in some cases the end cap can be changed to suit other motor outputs.
A range of hydraulic motors, braked hydraulic motors with pressure relief and/or overcenter valves can be supplied.
Right hand stock units can be converted to left hand units before despatch.
Email QCB Technical for advice.
Some of the different end caps designs available
Electric power
A suitably sized gearbox can be mounted to a QCB Slewing drive by means of a locally manufactured adapter flange and shaft extension.
This is useful for small volume or short delivery requirements.
For volume orders, or in cases where the client wishes to supply their own gearmotor, it may be possible to adjust the housing design and worm shaft ends before manufacture.
Calculation of input power requirements
To calculate the input torque and speed you need follow these simple calculations:-
Required input motor speed = load speed x reduction ratio
Required input motor torque = Load torque/Speed ratio/0.4
e.g. Assume you are using a WGSE 14 85 25 H R slew drive and you have a load torque of 5400 Nm you wish to slew at 1.5 rpm
Motor speed = 1.5 x 85 = 127.5 rpm; Motor torque = 5400/85/0.4 = 158.8 Nm
A suitable hydraulic motor or electric geared motor can now be selected.
(If you don’t know how to work out your load torque, ask us for help!)
More examples:-
Slew Drive Motor details Motor details
Basic Slew Drive Output torque Ratio Load speed Max speed &
Max torquePressure Flow rate 1/2 Speed &
1/2 TorquePressure Flow rate
Nm rpm bar lpm bar lpm
WGSE 3C ##1 400 62:1 2 AMM 32-P 45 6 AMM 32 P 25 5
WGSE 5A ##1 600 62:1 2 AMM 50-P 45 7 AMM 32 P 30 5
WGSE 7 ##1 1500 73:1 3 AMM 50-P 85 12 AMM 50 P 45 12
WGSE 9 6500 61:1 3 MSA 150 2M 130 35 AWMP 125 MX 75 26
WGSE 12 7500 78:1 3 MSA 150 2M 120 40 AWMP 125 MX 80 30
WGSE 14 8000 85:1 3 MSA 150 2M 120 44 AWMP 125 MX 80 35
WGSE 17 10000 102:1 2.5 MSA 150 2M 120 45 AWMP 125 MX 80 38
WGSE 21 15000 125:1 2 MSA 150 2M 150 45 AWMP 125 MX 100 50
WGSE 25 18000 150:1 2 MSA 150 2M 150 50 AWMP 125 MX 100 55
Slew Drive Motor details Motor details
Basic Slew Drive Output torque Ratio Load speed Max torque &
Max speedPressure Flow rate 1/2 Speed &
1/2 torquePressure Flow rate
Nm rpm bar lpm bar lpm
WGWEA 7 3500 47:1 2.5 MSA 125-2M 115 16 MSA 125 2M 55 15
WGWEA 9 8000 62:1 2.5 MSA 150-2M 150 28 MSA 125 2M 100 22
WGWEA 12 9500 79:1 3 MSA 150-2M 150 35 MSA 125 2M 90 25
WGWEA 14 10800 86:1 2.5 MSA 200-2M 125 45 MSA 125 2M 95 28
WGWEA 17 12900 104:1 3 MSA 200-2M 125 55 MSA 150 2M 120 30
WGWEA 19 18500 94:1 2 MSA 300-2M 120 62 MSA 150 2M 135 32
WGWEA 21 28700 90:1 2 MTAP 400-P 150 60 MTAP 300 P 95 45
WGWEA 25 34200 104:1 1.5 MTAP 500-P 125 85 MTAP 300 P 95 53
Over Center Valves: AWMP motors use an OCV15W; MSA motors use the OCV25S
Enquiry form & selection advice
To allow us to assist you please download the Enquiry Form which can be filled in manually or on screen and return it to info@qcbslewingrings.com
QCB Technical will rapidly evaluate your requirement, suggest a solution and quote with relevant CAD and STP files to minimise the time you spend on design.
Not sure what you need? Contact us and we will advise a solution based on your needs and budget!
Take advantage of our experience!
Let QCB turn your world…