Free 173 Best Homemade Tools eBook:  
Become a founding member: 500+ tool plans, full site access, and more.

User Tag List

Results 1 to 3 of 3

Thread: Mandrel dividing on a South Bend lathe

  1. #1
    Supporting Member olderdan's Avatar
    Join Date
    Jun 2016
    Thanked 1,397 Times in 436 Posts

    olderdan's Tools

    Mandrel dividing on a South Bend lathe

    Mandrel dividing on a South Bend lathe-imgp0253.jpg

    For many years now I have had a set up for dividing the lathe headstock for drilling, milling etc, using a live tool post spindle.
    Unfortunately this has always involved a rather tedious and messy set up i.e. removing all the change gears, taking off the guards, reversing the banjo, etc.
    Myford Super 7 owners are lucky to have a 60 tooth bull wheel for use but not so for my SouthBend.
    The trouble has always been finding an alternative solid mounting point for my 60-1 dividing attachment mounted in the usual place at the end of the mandrel (I have ground the bore of which true for 4 inches as this is a drilled item and is rarely concentric). The alternative would be to locate the gear by the machined o/d of the mandrel end.
    While removing the tumbler reverse gear assembly one day for cleaning, the light bulb in my head came on as I was looking at the perfect place, a solid hole in the head stock begging to be used for this.

    Mandrel dividing on a South Bend lathe-imgp0260.jpg
    A M/S expanding mandrel was soon made to fit said hole.
    Mandrel dividing on a South Bend lathe-screen-shot-12-09-16-07.10-pm.png
    Now after removing one bolt and slipping out the tumbler I can now leave all the change gears in place while I fit the dividing set up in a few minutes, I am now much more inclined to use it and as a bonus it is more rigid than the original set up. The whole assembly is a bit on the rugged side as it doubles with my table dividing head.

    Mandrel dividing on a South Bend lathe-imgp0254.jpg

    I hope this is of some use to anyone who is lucky enough to own one of these lathes but the idea may be adaptable to other machines.

    173 Best Homemade Tools eBook

  2. The Following 4 Users Say Thank You to olderdan For This Useful Post:

    Jon (Dec 15, 2016), Paul Jones (Dec 9, 2016), PJs (Dec 16, 2016), Toolmaker51 (Dec 16, 2016)

  3. #2
    Content Editor
    Supporting Member
    DIYer's Avatar
    Join Date
    Aug 2013
    Thanked 1,586 Times in 1,422 Posts

    Thanks olderdan! We've added your Lathe Expanding Mandrel to our Lathe Accessories category,
    as well as to your builder page: olderdan's Homemade Tools. Your receipt:

  4. #3
    Supporting Member Toolmaker51's Avatar
    Join Date
    Feb 2016
    Midwest USA
    Thanked 2,287 Times in 1,422 Posts

    Toolmaker51's Tools
    We don't always recall how useful expanding mandrels are, but common to part holding while machining. Olderdan and prove again by example and justification of same. This is why we're here.
    It can be simple as a proper diameter 'forced' open with a pipe plug, quite effective. Most sophisticated are probably the long taper arbor with a split or alternately segmented sleeve, usually cylindrical, running on centers.
    Useful as all get-out, like you know who's shirt pocket!
    Mandrel dividing on a South Bend lathe-expansion-mandrels.jpg
    Click the pic, it'll open lickety-split, as in tick sans a tock.

    173 Best Homemade Tools eBook
    Last edited by Toolmaker51; Dec 16, 2016 at 09:19 PM.
    ...we'll learn more by wandering than searching...

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)


Posting Permissions

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