D1790 – spindle

The D1790 is a micro-hole rear thrust PCB drilling spindle with a maximum speed of 285,000rpm, ideal for dedicated small hole, high speed, multi-spindle CNC drilling machines. It is fitted with a bonded 1/8” diameter collet (or 2mm) for easy maintenance, and suitable for drilling holes down to 0.05mm diameter. The maximum hole size capability is 3.2mm diameter.

Specifications of D1790 spindle

Speed range – shaft speed 30,000-285,000 rpm
Max. drill size – one shot/piloted 3.2 mm
Bearing air supply pressure7 kg/cm*2
Bearing air consumption - static74 nl/min
Max. dynamic runout (DRO)5 microns @ 285k rpm
Axial bearing positionRear
Axial failure load7.7 Kg
Radial failure load at collet4.5 Kg @ 285k rpm
Motor output power - continuous100 Watts (drive dependant)
Motor input voltage - max160 Volts
Weight3.3 Kg
Max. heat dissipation to coolant287 Watts
Coolant flowrate - water1 l/min
Collet type and diameterBonded, 1/8” or 2mm
Collet torque - max0.9 Nm
Speed sensor (tacho)Not fitted
ApplicationPCB micro-hole drilling
Minimum hole size in PCB material0.05


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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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.

Westwind recommend the use of distilled water with the addition of chemical agents to prevent algae or bacterial growth. Each spindle needs an uninterrupted flow at between 16-20ºC. Many spindles used in production are fitted with temperature sensors that shut the machine down before damage is done.

By clean air we mean the supply should be filtered to better than 0.01 microns and 99.99% free from oil and water as a liquid or vapour with a PDP (Pressure Dew Point) @ 7°C. Westwind are able to supply suitable filter units. Please note that in all cases we strongly recommend that the compressor system is backed up by a reservoir tank to maintain a steady pressure and to minimise the effects of an air failure.

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.