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Thread: PM 3520b bed extension questions

  1. #1
    Join Date
    Apr 2006
    Location
    Raleigh, NC
    Posts
    134

    PM 3520b bed extension questions

    Hi Creekers, I guess this is directed mainly to the 3520 owners.
    I'm about to pull the trigger on a full sized lathe soon but had a question
    about the 3520b that may sway my decision...
    I like the Robust and Stubby lathes for their swing capacity but was thinking maybe i could add the optional 50" bed extension to the lower position on the 3520's outboard and fabricate a riser block somehow for the tailstock assembly. This way i could support larger pieces initially with
    a tailstock before going to holding with only a faceplate or chuck on the headstock end.
    I'd need to cut off some of the leg that comes with the extension so it could be mounted at that lower height or just fabricate a new shorter leg from scratch.
    My question is alignment of the tailstock to the headstock,,
    Adding a 50" extension, fitting a leg at the tailstock end of it and then
    modifying the tailstock with a riser block to be tall enough to work would
    add a lot or room for perfect alignment errors.
    I'm sure if i moved the Headstock to the end of the ways and then
    slid up the Tailstock, getting the alignment would be easy,,,but
    if the extension bed was slightly off(which it easily could be) when i
    slid the tailstock further to the right on the extension bed,,,how
    would/could i acurately test it for alignment???
    This setup could be had for less than $4k which is considerably less
    than Robust's biggie and the Stubby and would have larger swing to boot.
    Think it's doable? Anyone done this yet?

  2. #2
    For the alignment concern, can't you use a laser pointer through the headstock spindle?

    Just a thought.
    Dario

  3. #3
    Don't know, but do know someone how might. Check with the aurther (sp?) of this: Link to another forum deleted

    or maybe this: http://turningaround.org/10ftPorchPosts.htm.

    This group would be knowledgable....Link to another forum deleted

    or maybe: Link to another forum deleted

    Some background info: Link to another forum deleted

    Rich S.
    Last edited by Andy Hoyt; 02-09-2007 at 1:39 AM. Reason: Links to other forums are not permitted per the TOS.

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