Welcome to the NavList Message Boards.

NavList:

A Community Devoted to the Preservation and Practice of Celestial Navigation and Other Methods of Traditional Wayfinding

Compose Your Message

Message:αβγ
Message:abc
Add Images & Files
    or...
       
    Reply
    Re: A-10 Sextant Manual
    From: Bill Morris
    Date: 2009 Jun 9, 13:36 -0700

    Douglas
    
    If you are sure that the index prism shaft anti-backlash spring is now working 
    and that you have removed all end float from that shaft, I agree the source 
    of your problem probably lies with the worm shaft assembly. The helical 
    antibacklash spring for the worm shaft is relatively weak, so if the 
    lubrication is no longer good, it may not be working. The assembly was never 
    meant to to be taken apart and, indeed, attempts to do so are likely to bend 
    something important. If it rotates freely and any end float upwards is 
    smartly returned downwards by the spring, all is well (some units were fitted 
    so well that no end float is detectable). If not, I suggest a little clock 
    oil on the bearings, encouraged by gentle warmth, until the shaft rotates and 
    slides freely. The assembly is dowelled to the frame, but it is just possible 
    that a previous explorer has damaged the dowel holes and some movement of the 
    whole assembly occurs, so check the three attaching screws are tight.
    
    You are by now no doubt very familiar with the anatomy, but I am attaching a 
    picture for those who are not.
    
    Bill Morris
    Pukenui
    New Zealand
    
    
    File:


    --~--~---------~--~----~------------~-------~--~----~ Navigation List archive: www.fer3.com/arc To post, email NavList@fer3.com To unsubscribe, email NavList-unsubscribe@fer3.com -~----------~----~----~----~------~----~------~--~---

       
    Reply
    Browse Files

    Drop Files

    NavList

    What is NavList?

    Join NavList

    Name:
    (please, no nicknames or handles)
    Email:
    Do you want to receive all group messages by email?
    Yes No

    You can also join by posting. Your first on-topic post automatically makes you a member.

    Posting Code

    Enter the email address associated with your NavList messages. Your posting code will be emailed to you immediately.
    Email:

    Email Settings

    Posting Code:

    Custom Index

    Subject:
    Author:
    Start date: (yyyymm dd)
    End date: (yyyymm dd)

    Visit this site
    Visit this site
    Visit this site
    Visit this site
    Visit this site
    Visit this site