The D1234 is a large workhead spindle with a maximum speed of 900rpm, suitable for supporting up to 300mm diameter wafer vacuum chucks for grinding processes. It is fitted with a smooth, low speed, direct drive brushless DC motor and high accuracy encoder. Belt drive versions are also available.
| Speed range | 1 - 900 rpm |
| Motor power | 190 W @ 400 rpm |
| Axial stiffness | 26.7 kg/micron |
| Axial load | 253 kg |
| Radial stiffness (at nose) | 19.6 kg/micron |
| Radial load (at nose) | 136 kg |
| Bearing air pressure | 5.6 kg/cm*2 |
| Bearing air consumption | 70 nl/min |
| Water cooling flowrate | 0.26 l/min |
| Axial runout | < 0.1 microns |
| Overall length | 535 mm |
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