Page 1 of 4 123 ... LastLast
Results 1 to 10 of 31

Thread: Large diameter pipe tailstock support?

  1. #1
    Join Date
    Dec 2016
    Location
    Helsinki, Finland, Europe
    Posts
    2,550

    Default Large diameter pipe tailstock support?

    Any tricks or tools for supporting large diameter pipe >4" in a medium-size 11x24 lathe?
    My fixed steady won't fit 4" pipe and I have used plastic plug supported with smaller tube inside the 4" and pressed on with live center.
    Sort of works but need to turn new plug for every pipe.
    Pipe live centers of this size are rare in MT3 size.

    Live 3-jaw chuck on tailstock?
    Might even let me face the end of the pipe if I would use small 2" or 3" 3-jaw chuck?
    Which would be actually a huge bonus if it works!


  2. #2
    Join Date
    Jan 2010
    Location
    Kansas City area
    Posts
    5,494

    Default

    You could get a small chuck and bore the center or make a backing plate that is a press fit on the straight part of a live center. Bore it with a step in the hole that contacts the tapered part so the chuck can't get pushed back too far. Then you would have a live tailstock chuck that would go inside the pipe for cheap.

  3. #3
    Join Date
    Dec 2016
    Location
    Helsinki, Finland, Europe
    Posts
    2,550

    Default

    Quote Originally Posted by Toolguy View Post
    You could get a small chuck and bore the center or make a backing plate that is a press fit on the straight part of a live center. Bore it with a step in the hole that contacts the tapered part so the chuck can't get pushed back too far. Then you would have a live tailstock chuck that would go inside the pipe for cheap.
    That sounds like a good idea. I saw some small chucks with M14 thread mount and was thinking of turning M14 thread to one of my crappy "import" live centers but your solution sounds even easier.

    Also just came to my mind that maybe I could use sort of "spider" what gunsmithing folks use, just internal. IE piece of 2" round stock with holes tapped radially. Insert inside the large tubing and fiddle all the screws tight.

  4. #4
    Join Date
    May 2015
    Location
    Somerset UK
    Posts
    1,678

    Default

    I once had to turn a piece of aluminium tube (a crossmember from the skids of a Bell 47, about 2 3/4" od by 3/8" wall) which turned out slightly bent, from a terminal heavy landing. I had assumed it was straight and was very disappointed, but had nothing else for the job. I cut it to length and filed the ends as square as possible and made a flanged plug with a centre in it. The tube was about 17" long, right at the limits of a Smart & Brown model A with a chuck, as it can just manage 21" between centres. I turned the right hand end over the last 3" to clean up and then repeated the process, with the other end. The ends were close enough in line for my purposes, and the curved centre section didn't matter. Fortunately, the parts which were to be fitted over the ends of the tube hadn't been bored at that stage.

  5. #5
    Join Date
    Mar 2017
    Location
    central MA
    Posts
    246

    Default

    Quote Originally Posted by MattiJ View Post

    Also just came to my mind that maybe I could use sort of "spider" what gunsmithing folks use, just internal. IE piece of 2" round stock with holes tapped radially. Insert inside the large tubing and fiddle all the screws tight.
    Yes, go with the spider. Attach a piece of bar stock, one inch diameter or what have you, to a three spoke backing plate that fits between the jaws of the chuck. Support the other end of the bar stock and spider with a regular live center in the tail stock. A little pressure from the tail stock and the whole issue is quite rigid.

  6. #6
    Join Date
    Feb 2014
    Posts
    829

    Default

    I just use a bull nose live center, they're intended for this job. Not sure why you'd think they aren't available for MT3, there are lots of them out there. Here's an example (just a random amazon link, I didn't pick this one specificially). If you work with larger pipe or tubing, these are a worthwhile tool to have.

    https://www.amazon.com/LC-P3A-Morse-.../dp/B00095VUBO

  7. #7
    Join Date
    Dec 2016
    Location
    Helsinki, Finland, Europe
    Posts
    2,550

    Default

    Quote Originally Posted by Yondering View Post
    I just use a bull nose live center, they're intended for this job. Not sure why you'd think they aren't available for MT3, there are lots of them out there. Here's an example (just a random amazon link, I didn't pick this one specificially). If you work with larger pipe or tubing, these are a worthwhile tool to have.

    https://www.amazon.com/LC-P3A-Morse-.../dp/B00095VUBO
    Umm, your link shows 3" diameter bull nose and I was interested in pipes OVER 4" diameter

    Yes, I could make my own 5" bull nose too..

  8. #8
    Join Date
    Dec 2009
    Location
    Stevens Point, WI
    Posts
    7,308

    Default

    I have turned up temporary slip fit/tap in "plugs" for the end of the pipe in which I would pilot a hole for a normal live center.
    Andy

  9. #9
    Join Date
    Dec 2015
    Location
    Chilliwack, BC, Canada
    Posts
    4,173

    Default

    Interchangeable head bullnose setup would be what you're looking for. HERE IS A LINK to a "system" that uses a low angle taper to accept interchangeable bullnose heads. The write up says 3.3 to 13.5 inches is handled in the basic kit and larger sizes can be had on demand.

    Or do you want a home shop made solution? If that's the case buy a live center you can service easily and remove the pointy bit and makeup a new center part which has a longer but still self releasing taper. then make your own bullnose heads from suitable materials.

    I rather like the idea though of a plate with screws that we set to fit inside. With a dial gauge it would be pretty fast work to set the screw heads to the correct spacing. But with the right sort of setup it would avoid the need for facing the end of the pipe being worked on. And it would only take a couple of sizes to cover quite a range.

  10. #10
    Join Date
    Mar 2008
    Location
    High, Wide and Handsome, Montana
    Posts
    1,021

    Default

    Google image search 'homemade steady rest'. Lots of iterations, including make it extremes from youtube. Some elaborate, some quick n dirty.
    I've been working on one I need to wrap up.

Posting Permissions

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