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

Thread: Unimat Boring Head Adapter for Criterion Boring Head

  1. #1
    Supporting Member Paul Jones's Avatar
    Join Date
    May 2014
    Location
    Del Mar, California
    Posts
    1,179
    Thanks
    5,327
    Thanked 1,297 Times in 622 Posts

    Paul Jones's Tools

    Unimat Boring Head Adapter for Criterion Boring Head

    I machined an adapter that attaches to the Unimat M12X1 spindle and has a 7/8-20 thread for a Criterion S-1 small boring head.

    I used 12L14 steel 1.25” hex rod for the adapter and the adapter is only 0.850” in height. Most the adapter blank was machined on the Unimat SL 1000 and the M12X1 thread was threaded with a tap and the top few threads removed and machined to 12mm diameter for a very snug fit on the Unimat spindle. I created a M12 threaded mandrel from T-303 stainless steel rod for duplicating the Unimat spindle on the larger lathe. The threaded mandrel was machined in-place on a 12” geared head lathe and then used to hold the boring head adapter for single point threading. A single point insert tool was used to machine 7/8x20 threads to precisely fit the Criterion S-1 small boring head.

    I included some photos of making the adapter and showing installed on my Unimat SL 1000 with an additional milling/drilling head (see Homemade Lathe Modifications for more information).
    Attached Thumbnails Attached Thumbnails Unimat Boring Head Adapter for Criterion Boring Head-unimat-boring-head-adapter-criterion-boring-head.jpg   Unimat Boring Head Adapter for Criterion Boring Head-unimat-machining-boring-head-adapter-criterion-boring-head.jpg   Unimat Boring Head Adapter for Criterion Boring Head-unimat-boring-head-adapter-installed-unimat-sl-milling-head.jpg   Unimat Boring Head Adapter for Criterion Boring Head-machining-unimat-boring-head-adapter-body.jpg   Unimat Boring Head Adapter for Criterion Boring Head-unimat-boring-head-adapter-m12x1-spindle-seven-eighths-20-thread.jpg  

    Unimat Boring Head Adapter for Criterion Boring Head-testing-unimat-boring-head-adapter.jpg   Unimat Boring Head Adapter for Criterion Boring Head-unimat-boring-head-adapter-m12x1-machining-mandrel.jpg   Unimat Boring Head Adapter for Criterion Boring Head-machining-m12x1-mandrel-unimat-spindle-tools.jpg   Unimat Boring Head Adapter for Criterion Boring Head-threading-seven-eighths-20-thread-unimat-boring-head-adapter.jpg   Unimat Boring Head Adapter for Criterion Boring Head-unimat-boring-head-adapter-ready-machining-threads.jpg  

    Last edited by Paul Jones; 03-21-2016 at 09:44 AM.

  2. The Following 3 Users Say Thank You to Paul Jones For This Useful Post:

    Jon (01-26-2016), kbalch (01-26-2016), PJs (01-26-2016)

  3. #2
    Content Editor
    Supporting Member
    DIYer's Avatar
    Join Date
    Aug 2013
    Posts
    3,091
    Thanks
    460
    Thanked 983 Times in 906 Posts
    Thanks Paul! We've added your Boring Head Adaptor to our Machining category, as well as to your builder page: Paul Jones' Homemade Tools. Your receipt:



    Post your reply!
    Join 41,949 of us and get our 173 Must Read Homemade Tools eBook free.



    173 Must Read Homemade Tools

  4. The Following User Says Thank You to DIYer For This Useful Post:

    Paul Jones (01-28-2016)

Thread Information

Users Browsing this Thread

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

Tags for this Thread

Bookmarks

Posting Permissions

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