Free 173 Best Homemade Tools eBook:  
Results 1 to 2 of 2

Thread: Broken and missing knob replacement

  1. #1

    Join Date
    Jan 2016
    Thanked 38 Times in 14 Posts

    lazarus's Tools

    Red face Broken and missing knob replacement

    I had a problem with a missing knob on the feed box for my lathe. The previous owner used a drift punch in the arm to lock the selection in. Broken and missing knob replacement-part_1465599088803.jpg
    This just don't cut it on a machine designed to make parts.
    Looking thru my junk stuff pile I found a 5lb dumb bell with a knurled handle. The weights unscrew from the handle and a file test told me that it was easily machinable.Broken and missing knob replacement-part_1465599466685.jpgBroken and missing knob replacement-part951465599523005.jpg.
    Hack sawed off the threads on one end and chucked up the handle. Drilled to size and depth for the arm and cleaned up the ends. Next problem was what to use for the engaging pin. A hinge pin seemed to beBroken and missing knob replacement-part951465599585525.jpg the perfect fit.
    The end was cut off the right length to retain the flange in the arm when the pin was completely engaged. the cutoff end was then welded to the back of the flange. Next was the spring. A salvaged spring from a destroyed china bb gun was the right size. A 1/4" pipe nipple was cut off and threaded and screw driver slot put in to install the assembly in the arm. A side hole was drilled and tapped in knob and a set screw installed on the shaft.Broken and missing knob replacement-part_1465599042470.jpg
    Cheap and dirty works for me. While doing this knob I decided to make a new knob for the elevation knob on the tool post grinder that was broken. I turned, drilled the 3/8 bore and removed from the lathe. Drill press and x block for the retainer pin hole and installed.Broken and missing knob replacement-part_1465599273989.jpgBroken and missing knob replacement-part951465599337700.jpg
    I think I'll get 2 or 3 more knobs from this handle. I wish people would throw more of them away.
    Last edited by lazarus; 06-10-2016 at 09:06 PM. Reason: correction

  2. The Following User Says Thank You to lazarus For This Useful Post:

    Paul Jones (06-10-2016)

  3. #2
    Content Editor DIYer's Avatar
    Join Date
    Aug 2013
    Thanked 954 Times in 879 Posts

    Thanks lazarus! We've added your Feed Box Replacement Knob to our Lathe Accessories category,
    as well as to your builder page: lazarus's Homemade Tools. Your receipt:

    Post your reply!
    Join 33,912 of us and get our 173 Must Read Homemade Tools eBook free.

    173 Must Read Homemade Tools

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