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IndustryArena Forum > MetalWorking Machines > Benchtop Machines > Stripped the column cap head screws on g0704
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  1. #1
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    Stripped the column cap head screws on g0704

    I managed to over tighten and strip the screws that attach the column to the base on my g0704.

    They are m12 cap head screws near the base there are 4 of them. Is it even possible to extract these?

    I stripped two of them like an idiot.

  2. #2

    Re: Stripped the column cap head screws on g0704

    Did you actually strip the threads or the socket head?

    If the socket head, you can drill the heads off. Just drill with a body sized drill bit until the head pops off. Slow speed and a lot of pressure, these are hard bolts. Then remove the column and remove the rest of the screw, or maybe you can screw it out with a pair of needle nose pliers
    Jim Dawson
    Sandy, Oregon, USA

  3. #3
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    Quote Originally Posted by Jim Dawson View Post
    Did you actually strip the threads or the socket head?

    If the socket head, you can drill the heads off. Just drill with a body sized drill bit until the head pops off. Slow speed and a lot of pressure, these are hard bolts. Then remove the column and remove the rest of the screw, or maybe you can screw it out with a pair of needle nose pliers
    Yeah the socket head I meant. So if I drilled the head of the socket head cap screw...it will just pop off? Is the head the only part holding the column against the base?

    Thank you for such a quick reply.

    I was thinking of using a hex bit driver and jbweld it and leave it 24 hour over night

  4. #4

    Re: Stripped the column cap head screws on g0704

    Quote Originally Posted by addman16 View Post
    Yeah the socket head I meant. So if I drilled the head of the socket head cap screw...it will just pop off? Is the head the only part holding the column against the base?
    That's pretty much the way a bolt works

    Thank you for such a quick reply.
    My pleasure

    I was thinking of using a hex bit driver and jbweld it and leave it 24 hour over night
    That might work also.
    Jim Dawson
    Sandy, Oregon, USA

  5. #5
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    Re: Stripped the column cap head screws on g0704

    Once you have taken off the head of the last bolts what might happen to the part that is freed?Consider very carefully the possibility that a large and heavy piece of machinery might land on your head.

  6. #6
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    Re: Stripped the column cap head screws on g0704

    Wouldn't fancy drilling it myself.
    I'd see if I could knock an imperial size bit in the bolt heads if the heads are metric.
    Or I'd grind a slot across the bolt head and use something with a flat end to screw it off.

  7. #7
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    Re: Stripped the column cap head screws on g0704

    Go buy a screw extractor set. They make them for SHCS.

    https://www.amazon.com/Irwin-Tools-5...24363678&psc=1

  8. #8

    Re: Stripped the column cap head screws on g0704

    The Imperial to metric method works. Assuming there is a slightly large Imperial size, just hammer it in and then turn.

    Or you can grind a slightly large allen to a hexagonal taper, hammer it in, and then turn. That has worked very well for me.

    I've also had good luck with left handed drill bits, you start drilling, pretty often the drill bit will grab and turn the bolt. If it does't grab, you just drill the head off.

  9. #9

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    Re: Stripped the column cap head screws on g0704

    If you can find a star bit of the right size which is a tight fit, it'll take the screw out. I remember reading somewhere a long time ago that hex bolts are engineered to strip out before any permanent damage should occur.

  10. #10
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    Re: Stripped the column cap head screws on g0704

    To be honest, Im a bit scared to drill the head off, considering that the bolt is under lots of tension, wouldnt the head fly off if I drill it off?

  11. #11

    Re: Stripped the column cap head screws on g0704

    No. The head would be captured by the drill bit, but it wont release with any appreciable force. You've never drilled the head off a bolt, obviously, nothing wrong with that though. All of the recommendations here are totally reasonable and safe. Pick one that suits you and go for it.

  12. #12
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    Re: Stripped the column cap head screws on g0704

    If you have enough room to work, the easiest way would be cutting a screwdriver slot in the bolt cap with a small angle grinder.

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