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: Intended High Resolution Chronometer
    From: Bill Morris
    Date: 2014 Feb 26, 19:41 -0800

    Brad,
    In the past like you I have advocated always approaching from the same side when using a micrometer sextant, but if adequately spring-loaded, it does not seem to matter to any detectable extent. Most micrometer mechanisms spring-load the worm against the rack (radial load) and the end of the worm against a solid abutment(axial load). Some do not have axial pre-load and rely on accurate fitting, e.g. some pre-WWII Hughes and Son, Filotechnica Salmoiraghi, Freiberger and SNO-T, and even these perform very well on the bench.

    Nevertheless, it is probably wise to approach a reading always from the same direction, preferably so the axial load is against a solid abutment rather than the spring and especially if the design has no axial preload spring.

    Bill Morris
    Pukenui
    New Zealand
    ----------------------------------------------------------------
    NavList message boards and member settings: www.fer3.com/NavList
    Members may optionally receive posts by email.
    To cancel email delivery, send a message to NoMail[at]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