First level of training (very easy techniques) :

• First theoretical notions on machining vibrations
• Simulation and measurement of static stiffnesses, natural frequencies, damping factor, and optimal cutting condition calculation.
• Analysis on the cases choosen by the client.

=> The trainees will be able to diagnose and methodically react in front of the machine-tool.

Second level of training :

• Theoretical notions on machining vibrations
• Measurement and analyze of machining vibrations signals
• Measure and analyse of spindle and axis vibrations.
• Measure and analyse of radial cutting force (because it is the fundamental source of machining vibrations)
• Analysis on the cases choosen by the client.

Recommendend measurement equipments :

• Microphone  : “blue snowflake” (from Amazon, ≈80€).
• Manual dynamometer 300 Newtons (≈160€ from : http://www.metil.be/pdf/sn-fr.pdf).
• Long stroke micrometric dial gauge (≈150€ from Mitutoyo, n° 513-425-10E).
• 1 or 2 accelerometers 8776A50M6 (sensitivity 100mV/g) (≈500€), 8452A (magnetic base) (≈140€), 8436 (standard base) (≈25€), 8432-5 (glue wax), BM-174-6 (cable) (≈45€, more lenght of cable +≈60€), + maybe 8778A500 (miniature sensor for small tool tap testing, 10mV/g) (≈790€) + maybe Kistler-8786A5 (≈650€) (high sensitivity sensor for axis machine analysis), from www.kistler.com
• USB signal conditionner “PLUG-n- DAQ Lite” (≈1000€) from www.roga-instruments.com
• 1 or 2 suitcase : https://www.amazon.fr/Brubaker-professionnelle-Entièrement-Modulable-aluminium/dp/B001NI6D3G, or : pelicases ≈ 250€ from www.abylon.fr
• Free Audacity software : https://www.audacityteam.org

=> The trainees will be able to precisely diagnose and methodically react using all the possibles techniques.

Example of expertise program :

• Half day for preliminary analysis and measure preparation :
  
  • Analysis of your documents (machines, tools, workpieces), recorded signals or sounds, analysis of previous studies made.
  • Planning the measurement day.
• One day for mesures :
  • Stiffness (machine axis, tool, tool-holder, workpiece, workpiece holder)
  • Frequencies (natural static frequencies, during rotation, during mouvements, during machining, etc.)
  • Damping coefficients.
  • Cutting forces.
• One day for analysis and synthesis.
  • Diagnosis.
  • Solutions definition.
• Debriefing meeting and discussions, about results and solutions to be applied.
  
  • All machining parameters are taken into account.
  • All possible solutions are studied in detail.

Examples of possible obtained solutions :

• Defect on a machine element (spindle, machine axis, tool holder, workpiece holder, etc.).
• New cutting conditions (rotational speed, engagement, machining strategy, etc.).
• Tool modifications (cutting angle, variable pitchs, damper, etc.).

ChatterMaster.com software and vibraction.fr website is edited by

Dr Lionel ARNAUD,

Phone +33 6 22 96 64 90,

Hosting : 

1&1 internet AG, Brauerstr. 48, 76135 Karlsruhe, Germany,

represented in France : 1&1 Internet SARL,

French SARL with «capital de 100 000 euros», address :

7 place de la gare, BP 70109, 57201 Sarreguemines Cedex,

registered « au Registre du Commerce et des Sociétés »,

as : RCS Sarreguemines B 431 303 775,

Directors of publication are : Markus Huhn and Robert Hoffmann

contact : http://assistance.1and1.fr/contact or phone : 0970 808 911.

Web site: www.1and1.fr

Address : UTTOP, 47 avenue d'Azereix, 65000 Tarbes, France.

Lionel ARNAUD : +33 6 22 96 64 90

lionel.arnaud@vibraction.fr