Download to read offline
Uploaded byReece Hancock
Backlash on machines
The document discusses backlash in machine tool lead screws. It aims to analyze the materials used for axial movement in manual machinery, specifically lead screws and nuts. It also aims to describe what backlash is in the context of machine tool lead screws. The document identifies that lead screws are typically made of hardened and ground steel to provide movement in three axes. It notes that nuts are often made of brass or bronze and discusses the reasons for these material choices. It also covers the concept of backlash, or wear, that can occur between the lead screw and nut, and how this impacts positioning precision.
Backlash on machines
- 1. AOMT Back Lash Lecturer –D.Evans
- 2. Aims of Session Toanalyse and evaluate the materials used for most manual machinery axial movement (lead- screws and nut) To identify and describe what backlash is in a machine tool lead-screw context.
- 3. Acme Thread Profile Hardened andground Steel (14 ½ degrees)
- 4. Acme Lead-screw …….. Providesthe movement in three axes as well as the screw cutting drive on most lathes. What do the three shafts do?
- 5. Early model –Later model Materials used…………… and why?
- 6.
- 7. Provides the axial movementin all three directions on milling machines
- 8. £125 for Zaxis and £125 for y axis lead-screw and nut £150 for X axis lead-screw and nut Available from a well known internet based auction site Efficiency?
- 9.
- 10. Strengths and weaknessesof Acme Backlash pic next slide
- 12.
- 13.
- 14. Just past zerodoh!! CW
- 15.
- 16.
- 19. How do wework with Backlash ?
- 20. Recap • Hardened andground steel shaft with powerful driving thread - cost • Brass/Bronze nut – reason and cost • Strength/Weakness • Product = Backlash
- 21.
- 22.
- 23. Aims of SessionMet? To analyse and evaluate the materials used for most manual machinery axial movement (lead- screws and nut)? To identify and describe what backlash is in a machine tool lead-screw context?
- 24.