Screw head sheared off?

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Bartelme
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Screw head sheared off?

Post by Bartelme » Sun Mar 30, 2014 1:09 pm

My gearbox locked up, when I was taking it apart I came across a sheared screw that holds together the two shells. The sheared screw is level with the surface of the shell. I haven't seen any screw extractors small enough for a screw this size. Is there any way to remove it without destroying the threads?
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Guges Mk3
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Re: Screw head sheared off?

Post by Guges Mk3 » Sun Mar 30, 2014 1:57 pm

Picture?
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Re: Screw head sheared off?

Post by Beta » Sun Mar 30, 2014 4:07 pm

I have a couple tricks we use when this happens on cars but you will need to be extremely careful because obviously gearboxes aren't as strong as a car haha.

1. You can punch it, you can take a small punch (or very small flathead) and put it at an angle on a flatspot or anywhere it can catch on the screw and tap it with a hammer until it twists enough to come off by hand.

2. depending on how rounded it is you can use a hex bit, the multiple points are harp enough that they will catch metal parts more easily.

3.(be very cautious with this one) you can hammer a smaller screwdriver into the screw to create a new slot, if you attempt this one you need to brace behind the screw on something sturdy but this is a risky thing to attempt.

4. you can drill the screw out but this requires the proper tools and a lot of caution so you do not go to big and grind the threads off.

5. try a flathead you dont mind beating up, with a good pressure on the flathead it can dig into the metal enough to catch and remove it.

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Trippy
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Re: Screw head sheared off?

Post by Trippy » Sun Mar 30, 2014 5:06 pm

Dremel. Find the appropriate size of bit, grind in a slot, and unscrew it. It might take a bit of work, but it will work and won't damage the threads.
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neoM4tech
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Re: Screw head sheared off?

Post by neoM4tech » Sun Mar 30, 2014 6:08 pm

Only suggestion I use that isn't listed is to jb weld a small allen wrench to the screw, allow to dry, and remove. This is my last resort, often the dremel cutting a new slot is enough.

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Bunny
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Re: Screw head sheared off?

Post by Bunny » Fri Apr 04, 2014 5:29 pm

By "sheared screw" I'm thinking that there is no head left on the screw at all? If that's the case a lot of these suggestions are unlikely to work.

Did you break the screw torsionally or was it already broken when you found it? If it was a torsional failure then it's very likely that the remaining screw shaft is good and well stuck into the threads, and you'll have a hell of a time getting it out.

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Bartelme
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Re: Screw head sheared off?

Post by Bartelme » Sun Apr 06, 2014 7:18 am

The head was sheared when I took the gearbox out the receiver. I tried to create a small notch for a small flat head screwdriver but I couldn't get the threads to turn. Looks like I'll just have to drill it out and buy a new shell. Thanks for the replies.
"I'm going to push my forward assist that this gun does not have, oh wait. I'm using the wrong caliber that's the problem."

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