An automatic bar lathe is a lathe that is used for the machining of bar-formed raw material. Through turning, a part of the raw material is separated and then further processed using milling processes. The term "machine" refers to its fully automatic workflow. The machine contains one or several spindles. Single spindle bar automatic lathes are able to use several working carriages simultaneously.
- Lathes used for machining operations
- Fully automatic workflow
- Manufacturing of simple components in large numbers
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The bar formed semi-finished workpiece is pushed directly through the hollow spindle. Multi spindle bar automatic lathes contain a bar receptacle behind the main spindle. This allows for a parallel, un-related processing of complex components. Through computer programmed control, several different machines can be simultaneously used. The efficiency of bar automatic lathes is played out in a variety of factors: the number of tools it can host; the possibility to quickly change tools; the simultaneous undertaking of various operational steps (e.g. the processing and post-processing of a bar in one step). In addition to fixed tools, power tools can also be used. A guide bushing with an integrated motor and liquid cooling allows for a very high rotational speed of the spindle.
TRAUB Bar automatic lathe in use
Special machines include the short lathes and the long lathes. Before the 1980s, when computer programming was widely used, cam control was used as the main system. There is a control shaft at the front of the machine that undertakes the turning in strokes. Using a cam disc, the direction of movement on the tool rails was predetermined and all the workflows were activated using cams or cam discs. The used market still contains a lot of these machines.