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.

If your question doesn’t appear, please get in touch with one of our experts.

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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.

The Westwind product line spare parts are manufactured to the same high quality and tolerances as our spindles (Westwind product line is ISO 9001:2015 registered). Our manufactured collets are specifically designed to operate at the high rotational speeds and dynamic run-out accuracy demanded by our customers. Alternative components cannot only reduce the life of the spindle, but may also affect product quality and output. Experience has shown that by fitting only genuine Westwind replacement parts, the high productivity, consistent accuracy, and outstanding operating characteristics can be maintained.

It is likely that contamination over a period of time has prevented the shaft from floating freely. We strongly recommend the unit be returned to your local Westwind product service centre for investigation.

This should be carried out at intervals recommended by the machine manufacturer. You are strongly advised to refer to the appropriate Westwind collet maintenance booklet (available free on request), and to use the Westwind collet maintenance kit available through your machine supplier. However, as a general rule we would recommend a maximum of 5,000 hours between removal/cleaning/re-setting, although some end users maintain their collets every 100 hours.