Thanks Thanks:  0
Likes Likes:  0
Needs Pictures Needs Pictures:  0
Picture(s) thanks Picture(s) thanks:  0
Results 1 to 6 of 6
  1. #1
    Join Date
    Nov 2008
    Location
    Perth WA
    Age
    71
    Posts
    5,650

    Default Tailstock Alignment - A Revisit

    This subject received a hammering a year ago so this is just a brush over. https://www.woodworkforums.com/f65/ta...6/#post1523980

    I mounted the Centricator* in the green lathe's spindle this morning, the one advantage of it being 3 Morse arbored, and did a bit of testing. The tailstock barrel, indicated off the bore, with the tailstock and barrel locked, was 0.003" low. I swapped some shims and added some of Bruce "Abratool" Smith's 0.0005" tape with a result of the barrel centreline now being a thin whisker shy of 0.001", maybe 0.0008" above the spindle centreline.

    Hercus published an inspection record in their 9 inch lathe sales brochure back in 1970 ( my lathe was built in '69). The permissible error for the tailstock axis in the vertical plane was 0.0005".

    I swapped indicators in the Centricator. Both gave similar readings. The Centricator is designed to be used both vertically and horizontally. Given the rubbery results I achieved previously using DTIs, dial indicators and convoluted setups, I'm tempted to believe today's findings.

    Any point chasing the additional error?

    BT

    * for those who aren't bored witless by Euro stuff, more here - https://www.woodworkforums.com/f65/ce...1/#post1539534
    Attached Images Attached Images

  2. # ADS
    Google Adsense Advertisement
    Join Date
    Always
    Location
    Advertising world
    Age
    2010
    Posts
    Many





     
  3. #2
    Join Date
    Jun 2008
    Location
    Victoria, Australia
    Age
    74
    Posts
    6,132

    Default

    Hi BT,

    I did the same thing with my cheap chinese centricator and worked well to confirm the lathe spindle was coaxial with the tailstock, but I don't think it works for alignment if the spindle isn't aligned with the lathe bed...

    So back to Rollie's dad..

    Regards
    Ray

    PS I sent you an email regarding a UPA2...

  4. #3
    Join Date
    Jul 2010
    Location
    Melbourne
    Posts
    7,775

    Default

    Hi BT

    No

    Whats the taper in the tailstock?

    Stuart

    p.s. Hi Ray, I didnt think RDM had anything to do with tailstocks?
    Last edited by Stustoys; 30th June 2013 at 08:21 PM. Reason: p.s.

  5. #4
    Join Date
    Nov 2008
    Location
    Perth WA
    Age
    71
    Posts
    5,650

    Default

    Two Stu.


    Edit : In a message from Pete F, he thought that indicator droop my still influence the accuracy of the readings. The device was intended for horizontal use even with lengthy stylus extensions. Given that the Centricator I used is in close to unused condition, I'm thinking droop my not be an issue. Hoping really.

    BT

    061 (Large).JPG

  6. #5
    Join Date
    Jul 2010
    Location
    Melbourne
    Posts
    7,775

    Default

    Quote Originally Posted by Anorak Bob View Post
    Two Stu.
    Damn
    Would have been nice to know the numbers from turing everythin around.... which wouldnt work properly unless you've made yourself a four jaw center?

    Stuart

  7. #6
    Join Date
    Jun 2008
    Location
    Victoria, Australia
    Age
    74
    Posts
    6,132

    Default

    Quote Originally Posted by Stustoys View Post
    p.s. Hi Ray, I didnt think RDM had anything to do with tailstocks?
    Yep, but you have to do it first, otherwise aligning the tailstock to the spindle is a waste of time...

    Regards
    Ray

Similar Threads

  1. Tailstock Alignment Using Test Bar- A Youtube Clip
    By Anorak Bob in forum METALWORK FORUM
    Replies: 47
    Last Post: 11th November 2012, 10:47 PM
  2. Simple Tailstock Alignment Check
    By electrosteam in forum METALWORK FORUM
    Replies: 1
    Last Post: 5th April 2012, 11:03 PM
  3. Tailstock Alignment Puzzle
    By Bryan in forum METALWORK FORUM
    Replies: 45
    Last Post: 5th October 2011, 11:00 PM
  4. Lathe headstock and tailstock are out of alignment
    By 19brendan81 in forum METALWORK FORUM
    Replies: 24
    Last Post: 22nd November 2010, 03:00 PM
  5. Drive and Tailstock Alignment
    By arniez in forum WOODTURNING - GENERAL
    Replies: 7
    Last Post: 15th December 2009, 11:54 AM

Tags for this Thread

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •