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Thread: Boring Bar Sleeves

  1. #1
    Supporting Member Paul Jones's Avatar
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    Del Mar, California
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    Paul Jones's Tools

    Boring Bar Sleeves

    The sleeves are 0.999" in outer diameter by 3” long and machined from 4140 steel. The sleeves inner diameters hold exactly 3/8” and ” diameter solid carbide shank boring bars. The boring bars are secured with three 10-32 stainless steel setscrews. Each of the setscrew end-points were machined flat to protect the expensive solid carbide boring bars from damage.

    The boring bar sleeves fit into a BXA boring bar holder for 1” diameter boring bars and sleeves. The new boring bar sleeves IDs were reamed to 0.375 and 0.500 inches to hold the solid carbide boring bars designed for CCMT 21.51 carbide inserts. The solid carbide boring bars are precisely made to be 0.0005” undersize and fit snuggly but easily into the reamed holes in the sleeves. I like the extra rigid support provided by the BXA boring bar holders over the BXA turning tool holders with V-grooves to accommodate boring bars.

    Boring bare sleeves with boring bars and BXA boring bar holder

    Boring Bar Sleeves-4140-steel-sleeves-solid-carbide-boring-bars.jpg

    Boring bar sleeve for 1/2" dia.

    Boring Bar Sleeves-4140-steel-sleeve-0.5-inch-solid-carbide-boring-bar.jpg

    Flat point modification for 10-32 setscrews

    Boring Bar Sleeves-machined-10-32-ss-set-screw-points-flat.jpg

    Machining the flat points on the 10-32 set screws using 3” chuck with toolmaker mini-jaws for hold small parts (see more on this at ).

    Boring Bar Sleeves-shortening-clamping-10-32-stanless-steel-setscrews.jpg

    Drilling and taping the boring bar sleeves

    Boring Bar Sleeves-drilling-boring-bar-sleeve-taping-10-32-threads.jpg Boring Bar Sleeves-taping-boring-bar-sleeve-10-32-threads.jpg

    Unfortunately while spot drilling the holes, the tip of a #0 long shank center drill broke off in one of the 4140 steel sleeves. I had to use a 1/8” dia. carbide end mill to remove the HSS remnant stuck in the hole. The HSS removal worked and the part could be saved. The small milling machine in the photo is a modified Unimat lathe (see more on this at ).

    Boring Bar Sleeves-unimat-rescue-carbide-end-mill-removes-broken-pilot-drill.jpg

    Thank you for looking,

    Attached Thumbnails Attached Thumbnails Boring Bar Sleeves-shortening-clamping-10-32-stanless-steel-setscrews.jpg  

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    Last edited by Paul Jones; Mar 29, 2018 at 01:48 AM. Reason: Rotated photo for better view

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

    Carlos B (Mar 13, 2017), jjr2001 (Mar 10, 2017)

  3. #2
    Content Editor
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    Aug 2013
    Thanked 1,527 Times in 1,369 Posts

    Thanks Paul Jones! We've added your Boring Bar Sleeves to our Machining category,
    as well as to your builder page: Paul Jones's Homemade Tools. Your receipt:

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

    Paul Jones (Mar 10, 2017)

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