Miller Electric

Welding Discussion Forums

Home » Resources » Communities » Welding Discussion Forums
 
Miller Welding Discussion Forums - Powered by vBulletin

Results 1 to 9 of 9

Threaded View

  1. #1
    Join Date
    Sep 2005
    Location
    northern NJ
    Posts
    1,821

    Default Broken/stuck bolt

    Had a job this week to remove a broken bolt. 3/4-10 x 4.5" long bolt, about 2.25" of thread in a blind hole snapped off just below the surface. The bolt is one of four that hold a pillow block bearing for the disc on a track chipper.

    No way to weld something on to the bolt unless we disassembled the chipper to remove the disc so I drilled. First a small pilot at 1/4". The problem was from the top of the pillow block to the mounting pad was 2 5/16" but I was just able to grip the end of the bit to get almost through it. Once I got to a 3/8" bit I was able to drill all the way through the bolt. Then to 1/2" bit, luckily I was able to drill through the bottom plate too so it was no longer a blind hole. I figured I would drill up from the bottom with a 9/16" bit & it would catch & spin out the top. No such luck. I tried heating what was left of the bolt but no luck either. Drilled it to 21/32" which is the tap drill size & re tapped it very slowly.

    Very limited working area but finally got it. I did recommend at one point to just drill it clean through at 3/4" & put a bolt & nut as it would be cheaper but customer said to keep trying to remove it.

    First pic is the work area. Second pic is the pillow block. Third pic is the hole. I know it looks off but just the angle of the pic. Fourth & fifth pic is where the hole came through. I crawled in to drill up from here.
    0821031122.jpg0821031121a.jpg0821031121.jpg0821031122a.jpg0821031122b.jpg
    Last edited by MMW; 08-22-2013 at 07:16 PM.
    MM250
    Trailblazer 250g
    22a feeder
    Lincoln ac/dc 225
    Victor O/A
    MM200 black face
    Whitney 30 ton hydraulic punch
    Lown 1/8x 36" power roller
    Arco roto-phase model M
    Vectrax 7x12 band saw
    Miller spectrum 875
    30a spoolgun w/wc-24
    Syncrowave 250
    RCCS-14

Posting Permissions

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

Warning: Non-static method PhpQuickProfiler::getMicroTime() should not be called statically in /mnt/stor3-wc1-dfw1/357822/357839/www.millerwelds.com/web/content/lib/pqp/classes/Console.php on line 77

Warning: Non-static method PhpQuickProfiler::getMicroTime() should not be called statically in /mnt/stor3-wc1-dfw1/357822/357839/www.millerwelds.com/web/content/lib/pqp/classes/Console.php on line 77

Warning: Non-static method PhpQuickProfiler::getMicroTime() should not be called statically in /mnt/stor3-wc1-dfw1/357822/357839/www.millerwelds.com/web/content/lib/pqp/classes/Console.php on line 77

Warning: Non-static method PhpQuickProfiler::getMicroTime() should not be called statically in /mnt/stor3-wc1-dfw1/357822/357839/www.millerwelds.com/web/content/lib/pqp/classes/Console.php on line 77

Warning: Non-static method PhpQuickProfiler::getMicroTime() should not be called statically in /mnt/stor3-wc1-dfw1/357822/357839/www.millerwelds.com/web/content/lib/pqp/classes/Console.php on line 77

Warning: Non-static method PhpQuickProfiler::getMicroTime() should not be called statically in /mnt/stor3-wc1-dfw1/357822/357839/www.millerwelds.com/web/content/lib/pqp/classes/Console.php on line 77

Warning: Non-static method PhpQuickProfiler::getMicroTime() should not be called statically in /mnt/stor3-wc1-dfw1/357822/357839/www.millerwelds.com/web/content/lib/pqp/classes/Console.php on line 77

Warning: Non-static method PhpQuickProfiler::getMicroTime() should not be called statically in /mnt/stor3-wc1-dfw1/357822/357839/www.millerwelds.com/web/content/lib/pqp/classes/Console.php on line 77

Warning: Function split() is deprecated in /mnt/stor3-wc1-dfw1/357822/357839/www.millerwelds.com/web/content/lib/footer.inc.php on line 62

Welding Projects

Special Offers: See the latest Miller deals and promotions.

Warning: Function split() is deprecated in /mnt/stor3-wc1-dfw1/357822/357839/www.millerwelds.com/web/content/lib/footer.inc.php on line 137