Jet BD-11G, Operating Manual, Page: 23 / 48

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Lead screw for thread-cutting or feed for straight turning with change gear set
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Adjustable tailstock for taper turning
4.2 Lathe bed
The lathe bed integrates the headstock and the driving unit, for attaching the apron and lead- screw and for guiding
the lathe saddle and tailstock.
4.3 Headstock
The headstock houses the feed gear and the reducing gear with pulleys. The work spindle transmits the torque
during the turning process. The work spindle also receives the workpieces and clamping tools.
The work spindle is driven an electromo- tor, via pulleys. The replacement of the change gears for other feeds is
carried out on the headstock.
4.4 Feed gear
The feed gear is used to select the feeds for straight turning as well as for thread- cutting. In order to achieve
certain thread pitches, it is necessary to replace the change gears.
The torque of the work spindle is transmit- ted to the feed gear and thus to the lead- screw.
4.5 Apron
The apron houses the lead screw nut with an engaging lever for activating the auto- matic feed as well as the
handwheel for manual feed. The straight turning and cross slide are located on the apron with bed guidance
4.6 Tailstock
The tailstock is used for centring and drill- ing, supporting long shafts, turning between centres as well as
turning long, thin tapers.
5. Operation
5.1 Safety
Use the lathe only under the following conditions:
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The lathe is in proper working order.
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The lathe is used as prescribed.
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The operating manual is followed.
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All safety devices are installed and activated.
All anomalies should be eliminated immediately. Stop the machine immediately in the event of any
abnormality in operation and make sure it cannot be started up accidentally or without authorization.
Notify the person responsible immediately of any modification.