BS 3800-3:1990
Current
The latest, up-to-date edition.
General tests for machine tools Method of testing performance of machines operating under loaded conditions in respect of thermal distortion
Hardcopy , PDF
English
28-09-1990
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Foreword
Committees responsible
Method
1. Scope
2. Test conditions
3. Thermal distortion of structure
4. Thermal drift of axis drives
Figures
1. Typical set-up for measurement of thermal
distortion of the structure of a vertical
machining centre
2. Typical set-up for measurement of thermal
distortion of the structure of a slant bed lathe
3. Temperature and deflection versus time for warm-up
of the structure of a machining centre, 4000 r/min
spindle speed
4. Typical set-up for measurement of thermal drift
of the x-axis drive of a machining centre
5. Typical set-up for measurement of thermal drift
of the z-axis drive of a CNC lathe
6. Positional error plot (example 1)
7. Positional error plot (example 2)
8. Drift of end point of axis during warm-up and
cool-down for a typical CNC lathe
9. Positional error plot (example 3)
10. Positional error plot (example 4)
Method of assessing inaccuracy arising from thermal distortion of the machine in respect of distortion of the structure and also drift of the axis drive.
| Committee |
MTE/1
|
| DevelopmentNote |
Supersedes 88/74114 DC (07/2005) Reviewed and confirmed by BSI, October 2012. (09/2012)
|
| DocumentType |
Standard
|
| Pages |
18
|
| PublisherName |
British Standards Institution
|
| Status |
Current
|
This Part of BS 3800 gives methods for assessing the contribution to workpiece inaccuracy arising from the thermal behaviour of the machine, due to internal heat sources, in respect of:
- distortion of the structure; and
- drift of the axis drives.
The tests for thermal distortion of the structure are applicable to any machine which incorporates a rotating spindle or spindles supporting the tool or the workpiece. The tests are designed to establish the relative displacements occurring between the tool and workpiece sides of the structure as a result of thermal expansion or contraction of key structural elements .
The tests for thermal drift of the axis drives are applicable to numerically controlled (NC) machines only and are designed to quantify the effects on positioning accuracy and repeat ability of thermal expansion and contraction of the axis drives .
| BS 4656-30:1992 | Accuracy of machine tools and methods of test Specification for machining centres and computer numerically controlled milling machines, horizontal and vertical spindle types |
| BS 4656-16:1985 | Accuracy of machine tools and methods of test Methods for determination of accuracy and repeatability of positioning of numerically controlled machine tools |
| BS 3800-2:1991 | General tests for machine tools Statistical methods for determination of accuracy and repeatability of machine tools |
| BS 3800-1:1990 | General tests for machine tools Code of practice for testing geometric accuracy of machines operating under no load or finishing conditions |
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