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Powermatic 3520b Spindle lock solution

Discussion in 'Tutorials and Tips' started by WoO, Mar 20, 2012.

  1. WoO


    Sep 22, 2005
    Olympia, Washington
    Home Page:
    I apologize if this has been handled in past forum discussions, but it's been awhile since I've logged on and I don't see a way to search the historical posts. so with that apology, here's my question with which I need help from you 3520b owners.

    Our club has recently acquired two 3520b lathes and I'm looking for a way to hold in the spindle lock without having a third hand. I have a Powermatic 4224 in my shop and the spindle lock on it has a nut that screws in to hold the spindle lock in position allowing both hands to be free.

    I've heard some people have solved this problem on the 3520b, but before I go drilling holes, or other modifications I thought I'd seek help from those of you who have already solved this issue.
  2. Mark Warden

    Mark Warden

    Feb 9, 2009
    Sinking Spring Pa.
    Hi Larry here is my solution just a Neodymium magnet and the key from a oneway chuck. Cheap easy and effective.

    Attached Files:

  3. john lucas

    john lucas AAW Forum Expert

    Apr 26, 2004
    Cookeville TN USA
    There are two very easy alternatives. One is to simply drill a hole in the button guard so you can install a pin of some sort when the button is pushed in. this keeps the button in.
    The second is to loosen the top screw on the button guard just a hair and then remove the bottom screw. This lets the button guard shift so you can rotate it over the button to hold it in.
    I've had my 3520A for about 5 years now and have never used either on. I thought it looked like a good idea but I've never had a problem holding the button in when I need to.
  4. ihmserv


    Jan 19, 2007
    since the 3520b has an indexing system, the easiest way I know to hold the spindle is to drop a piece of 1/4 inch dowel into one of the holes. stops the spindle from turning but won't do any damage to anything if someone forgets its there and turns on the lathe. NOT that I have ever done that.

    I personally only need to lock the spindle in place if i am trying to spot sand a trouble spot on a piece. so this is the fastest way to do it that I have found.


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