SUA 125 NUMERIC
34200003 TOS a.s. 02/2011
20
2.6. General Data Concerning Centre Lathe with CNC Control.
CNC lathe: is machine tool with the main circular motion (rotary motion) of a rotary workpiece as a rule.
It serves predominantly for the machining of outside surfaces of revolution but it is possible to machine inside surfaces of
revolution and plane surfaces.
Machining - turning: is ensured by means of a control system on the basis of a control programme of a workpiece in an
operator’s presence. The operator should be informed of a control procedure, how to start and run the lathe and how to
ensure single turning operations. This procedure with the risk analysis in turning operation according to ČSN EN 292
Standard and programmed by means of the control system are mentioned in the following parts of this Manual.
Basic machine posibilities for safe operation of lathe,
which is classified among machinery as far as safety of operation is concerned. The following points should be ensured by:
The manufacturer.
- design
- suitable covering of dangerous space
- blocking end positions of moving parts
- presenting appropriately pointing up demands on the operator safety, mentioned in this Manual chapters.
The user,
- the universal rules for the safe control of machinery should be followed
- the requirements for the operator safety, mentioned in this Manual must be complied with.
Analysis of basic posibilities for the safe operation of lathe from point of view of its service.
Design makes demands for ensuring the quantitative and qualitative max. parameters as follow:
- swing over bed and carriage
- length between centers
- range of work spindle speed
- carriage feed
- torque on spindle
- cutting force
- workpiece mass carried between centres and in rest
- speed in machining process of workpiece of max.mass and workpiece accuracy of manufacture.
The limited parameters, except accuracy, concerning the lathe safety of operation must be complied with by its user and
service in the operation process.
Suitable covering of a dangerous space is the main demand for the elimitation of:
- mechanical risks - safety of operation
- risks from substances in machining process (cutting lubricant, evaporations separated in course of turning etc.) - hygiena
and ecology of work.
Blocking of end positions makes demands for ensuring the safety of operation, e.g. a carriage possition.
The requirements for the safety of operator are mentioned and pointed up in this Manual and conditioned by:
- qualification and continued knowledge of the operator about the safety Standards of A type
- complying with the universal and single demands on the safe service set on the basis of the safety Standards B and C type
and appropriate EU directives (Counsil Directive 89/392/EEC, 91/368/EEC, 93/44/EEC and 93/68/EEC) mentioned in
single Manual chapters.
Suitable covering, blocking and following the rules for the safe lathe control are the main assumption for the safety of
operator given by the manufacturer.
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