D1091 – Manual Collet – Light machining spindle

The D1091 is a small air turbine-driven spindle for light machining duties, with a maximum speed of 100,000rpm. It is fitted with a manual collet system, with sizes from 0.5mm to 5mm diameter available. Due to its compact size and air-cooled body, installation into any precision machine tool is simple. An optional speed sensor can be supplied for accurate turbine speed feedback.

Specifications of D1091 spindle

Max. operating speed100,000 rpm
Collet bore sizes0.5 to 5mm
Turbine air consumption113 nl/min
Bearing air supply pressure5.6 kg/cm*2
Bearing air consumption39 nl/min
Axial failure load - push75 N
Collet tool runout - max0.01mm
Dynamic runout at tool10 μm
Motor typeAir turbine
Speed sensor (Tacho) - OptionalHall effect
Radial failure load at collet face35 N @ 100,000 rpm
Axial failure load (push)75 N
Body diameter41.3 mm
Weight (approx)1.1 kg


Have a question about the Air Bearing Spindles product range? Here we answer a selection of frequently asked questions.

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Westwind spindles, when correctly installed and supplied with clean adequately filtered air, give many years’ service with the minimum of attention. Routine maintenance is limited to changing the air filter elements so that the air supply remains uncontaminated. Guidelines can be found online for spindle and collet maintenance.

No, you do not need to add lubricating oil to the air supply of the air bearing spindle.  This does not work like a ball bearing spindle. You should not add oil, as air bearings, being non-contacting, do not need a fluid lubricant.

Most Westwind air bearing spindles are fitted with integrated asynchronous AC squirrel-cage electric motors. However, some more specialized spindles, especially for advanced material processing applications, are fitted with integrated brushless DC motors.  Currently, all Westwind atomizer spindles are driven by integrated air turbine motors. Learn more about our Coating Atomizer Series Spindles here.

For all high speed Westwind air bearing spindles, it is necessary to fit a motor controller between the spindle and the main supply, as frequency and voltage controls are necessary to rotate the shaft at the correct speed. These drives create very high frequency outputs from the main input frequency of 50 or 60 Hz.

Yes, most Westwind spindles are fitted with a speed sensor to facilitate shaft speed measurement.