Boring heads?

  1. grim_d

    grim_d Unlikeable idiot.

    Messages:
    3,097
    Location:
    Scotland - Ayrshire
    I got these along with my mill, chucked them into a drawer and just found them a couple days ago.

    They look to me like types of boring head? Turning the indicator drives a worm that (presumably) moves the sleeve in and out, though the few with sleeves are very stuck.

    How is a tool held in these? There a cap head screw going through the bottom (one is sticking out in the picture) but it doesn't seem to do much.

    IMG_20200429_230952.jpg IMG_20200429_230949.jpg
     
  2. Agroshield Member

    Messages:
    1,373
    I think these are a cartridge-style boring head. I think they take inserts similar to those shown here:

    https://www.zoro.co.uk/shop/microbo...ng/adjustable-cartridge-boring-system/f/26869

    On some of the styles, the insert goes through the middle of the graduated dial, but on your ones, it appears to sit alongside the dial.

    As you say, the dial gives fine adjustment of the cutting bit. Perhaps the screw at the end is to lock it once set for proper diameter. They are for a fairly specific and narrow range of bore sizes, unlike a more general purpose boring head like a Nikken or Wohlhaupter.
     
    Hopefuldave and pressbrake1 like this.
  3. pressbrake1

    pressbrake1 Forum Supporter

    Messages:
    2,884
    essex england
    Microbore inserts.
    They were mainly invented for semi production so they were set and left.I think they are a devlieg invention
    But they are really rigid which is useful, I use them on my newall jig borer but range is limited
     
    Hopefuldave and mtt.tr like this.
  4. grim_d

    grim_d Unlikeable idiot.

    Messages:
    3,097
    Location:
    Scotland - Ayrshire
    Do we think these inserts are related? They are internally threaded, possibly for a tiny drawbar?

    Not that it matters now as I donated them all to a member on here.
     
    • IMG_20200411_133927.jpg
  5. pressbrake1

    pressbrake1 Forum Supporter

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    2,884
    essex england
    For wide boring head
     
  6. Agroshield Member

    Messages:
    1,373
    You have seen more of these than I, but to me the ones he shows seem a bit unusual in that the bit appears to stick out at 90 degrees to the shank, meaning they cannot be used in blind bores, only through holes. On the Devlieg ones I have seen, it is always at 45 degrees, at the bottom of the tool.
     
  7. pressbrake1

    pressbrake1 Forum Supporter

    Messages:
    2,884
    essex england
    My devlieg ones and newall have 90 and 45 facilities
     
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