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What is Twist ?

Cylinder Map (Twist). Cylinder Map (Twist) Available on Certain Talyronds Only. A Suitable Software Licence is Required. Talymap Twist analysis required. What is Twist ?. Twist Measurement Strategy. Set Up Component and Instrument. Measurement & Data Export Settings.

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What is Twist ?

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  1. Cylinder Map (Twist) • Cylinder Map (Twist) • Available on Certain Talyronds Only. • A Suitable Software Licence is Required. • Talymap Twist analysis required. What is Twist ? Twist Measurement Strategy Set Up Component and Instrument Measurement & Data Export Settings Measure Vertical Traces & Export Data View and Analyse Results Twist Parameter Definitions

  2. Cylinder Map (Twist) What is Twist ? • Twist is similar to the effect of a screw thread being present on a shaft. • Twist affects the effectiveness and the lifetime of the seals placed in contact with the shaft causing leakage (or retention) due to pumping action or dry-running, leading to premature failure. • Typically the analysed twist surface wavelength is <0.4mm in length, inline with the size of the lipped polymer seal. Retention of liquid example shown above

  3. Cylinder Map (Twist) What is Twist? • Twist analysis is a method of quantifying the twist on the shaft. • developed and patented by Daimler-Chrysler AG • uses an 3D Cylinder map of the surface • measurements can be taken with suitable Talyrond instruments • existing methods are based on the use of a weighted string. The shaft is turned in both directions and the distances moved noted.

  4. Cylinder Map (Twist) Twist Measurement Strategy • Axial extent • The axial extent of the data should be sufficient to cover the area of interest (where the seal is going to contact the shaft). • It should be greater than 2mm and no less than 4000 points (see Level 2 Standard extract). • Note, Required data spacing of 0.5µm • On an unknown twist quantity, two measurements are initially required. Radial extent • Data must be taken using 72 traces spaced at either 5 or 0.5 degree intervals (covering 360 or 36 degrees measurement angle). • Use 5 degree spacing for measuring components with a low number (<15) of starts per revolution. • Use 0.5 degree spacing for measuring components with a high number (≥15) of starts per revolution. • Extract from Daimler standard shown right

  5. Multiple Straightness Measurements Export 3D ‘*.sur’ File to TalyMap Cylinder Map (Twist ) Set Up Component and Instrument CYLINDER MAP & / or

  6. Cylinder Map (Twist ) Set Up Component and Instrument Prior to Measurement Calibrate Talyrond using 2µm or 5µm diamond stylus Stylus force set to <1g using Correx gauge.

  7. Set Up Component and Instrument Data Length Start (Z) Start (θ) R Cylinder Map (Twist) Important: Centre / Level Component Well Move Arm into Contact  Calibrate Arm (UCS) to Component Radius (R) Calibrate Column (UCS) to Component Start (Z)  0mm Rotate Spindle To Start (θ) 

  8. Measurement & Data Export Settings Select Measurement Type (Cylinder Map)  Press Cylinder Map (Twist) Complete Dialogue OK 

  9. Measurement & Data Export Settings Cylinder Map (Twist) Choose ‘Measure’ Tab  Enter Measurement Name or Select Auto-Name as Required  MEASUREMENT NAMING

  10. Measurement & Data Export Settings Deselect ‘Delete After Export’ to Retain Individual Straightness Results in ULTRA Database Cylinder Map (Twist) Choose ‘Export’ Tab  Choose Destination Folder & File as Required  EXPORT SETTINGS

  11. Measurement & Data Export Settings Cylinder Map (Twist) Choose ‘Z-Axis’ Tab  Enter Vertical Measurement Details as shown  COLUMN SETTINGS Gauge Range reduced to 0.41mm giving a resolution of 6.4nm

  12. Measurement & Data Export Settings Cylinder Map (Twist) Choose ‘C-Axis’ Tab  Enter No. of Traces, Trace Spacing & Measurement Direction  SPINDLE SETTINGS SHOWN FOR THE TWO MEASUREMENTS INITIALLY REQUIRED Enter Comments if Required  Press OK 

  13. Measure Vertical Traces & Export Data Measurement Progress Indication: Data Export Progress Indication: Cylinder Map (Twist) Wait for Straightness Measurements & Data Export to Complete 

  14. View and Analyse Results Cylinder Map (Twist) Open TalyMap  File  Open a the Studiable 

  15. Cylinder Map (Twist) View and Analyse Results Operators  Rotations  Clockwise rotation of 90° OK 

  16. Cylinder Map (Twist) View and Analyse Results Highlight Rotated Study in Talymap  Lead Analysis (Twist)  OR

  17. Cylinder Map (Twist) View and Analyse Results Ensure Part Diameter Correct  Ensure Area of Twist is encompassed within box  OK 

  18. Cylinder Map (Twist) View and Analyse Results Daimler Chrysler Patented Analysis Displayed by Talymap

  19. Cylinder Map (Twist) Twist Lead parameters Definitions

  20. Cylinder Map (Twist) Twist Lead parameters (continued)

  21. Cylinder Map (Twist) • Cylinder Map (Twist) • Available on Certain Talyronds Only. • A Suitable Software Licence is Required. • Talymap Twist analysis required. What is Twist ? Twist Measurement Strategy Set Up Component and Instrument Measurement & Data Export Settings Measure Vertical Traces & Export Data View and Analyse Results Twist Parameter Definitions

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