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timbercruiser View Drop Down
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Posts: 23 		  Quote timbercruiser Quote  Post ReplyReply Direct Link To This Post Topic: Broke screw
    Posted: November/27/2009 at 23:04
I needed to change a scope on my muzzleloader to a better scope,and mounts and one of the screws, must have been slightly defective, broke off in the barrel. It is a Knight Vision rifle with split bases. Does anybody make a rail base to fit a Vision? I would feel better with three screws in a long base rather than the split base. The gun shop tried to drill it out, but couldn't even dimple the screw. I went to a machine shop and got a couple of the best bits they have and they wouldn't touch the broke screw.
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Posts: 5268 		  Quote Kickboxer Quote  Post ReplyReply Direct Link To This Post Posted: November/27/2009 at 23:14
Was the rifle clamped onto a drill press and they could not drill the screw out??  I can drill just about anything.  I've never seen one that couldn't be drilled out.
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Posts: 23 		  Quote timbercruiser Quote  Post ReplyReply Direct Link To This Post Posted: November/27/2009 at 23:21
No, rifle in a gun vise using a Makita drill. Down here I don't know of a gunsmith that is equipped with a drill press for a rifle. The guy at the local gun shop said it was the first for him.... I might have to ship the rifle to someone.
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Posts: 5268 		  Quote Kickboxer Quote  Post ReplyReply Direct Link To This Post Posted: November/27/2009 at 23:24
Your machine shop should have a drill press.  I don't think you'll ever get it with a hand drill, without damaging the barrel.  You certainly don't want to mount with only three screws.  
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Posts: 1155 		  Quote bricat Quote  Post ReplyReply Direct Link To This Post Posted: November/28/2009 at 00:06
I had that happen once, I tried drilling it out with a regulr drill bit and it didn't work, so I did the most retarded thing ever, I pushed down harder on the drill with all my weight - of course the drill bit broke and the drill (with it's broken bit) danced along the top of my brand new Conquest 3-9X40 - It looked like it was hit with a German 88mm flak round!  Bought a carbide tip drill bit and blew right threw it with no problem, guess I should have done that first!  Hammer

Edited by bricat - November/28/2009 at 00:39
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Posts: 2238 		  Quote 3_tens Quote  Post ReplyReply Direct Link To This Post Posted: November/28/2009 at 09:51
Few gun shops have a gunsmith. I never let a guy at a gunshop work on any of my firearms. I want a gunsmith that knows what they are doing. Be sure to torque your screws properly. Tractor tight is over tight.
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Posts: 5323 		  Quote tahqua Quote  Post ReplyReply Direct Link To This Post Posted: November/28/2009 at 12:14
Before ever going into a machine vice I would try this; get a suitably small prick punch. Tap a small detent in the top of the broken screw. Then, tap at an angle in the CCW direction. This should back the screw out unless it is bottomed out tightly, has been burred over by previous attempts or the screw is broken off deep inside the tapped hole.
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HuntMaster View Drop Down
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Posts: 534 		  Quote HuntMaster Quote  Post ReplyReply Direct Link To This Post Posted: November/28/2009 at 20:28
Timbercruiser,
contact Jim McCollough of McCollough Rifle Co. , or Harvey King of HK Arms. Both are in Selma, Al and do great work, for very reasonable prices. Either one should be able to help you out.
 
Derek
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Posts: 6442 		  Quote Urimaginaryfrnd Quote  Post ReplyReply Direct Link To This Post Posted: November/28/2009 at 21:16
Dremell makes some diamond coated bits for a dremell tool. If you can cut a slot in it you might be able to get a small screwdriver on it. Use liquid wrench  and use heat from a torch.
 
There are also some reverse cut drill bits not sure if you can find one small enough though.


Edited by Urimaginaryfrnd - November/28/2009 at 21:20
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trigger29 View Drop Down
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X = 180 Y = 90 (X+Pyro)+(Y-Pyro) = ?

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Posts: 2200 		  Quote trigger29 Quote  Post ReplyReply Direct Link To This Post Posted: November/28/2009 at 21:21
I don't know if I want that much heat on a rifle barrel, but I'm not a metallurgist......that question is for Dale. The liquid wrench may help though. A good carbide left handed drill bit in a drill press may be the ticket. Sometimes the bit trying to cut while turning left is enough to turn the screw out.

Edited by trigger29 - November/28/2009 at 21:22

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Urimaginaryfrnd View Drop Down
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Posts: 6442 		  Quote Urimaginaryfrnd Quote  Post ReplyReply Direct Link To This Post Posted: November/28/2009 at 21:26
I would think it could take a little heat which if there is locktite involved might make a difference but err on the side of caution and go to the gunsmith.  Anyone who doesnt have a drill press and a lathe is probably not a real gunsmith.
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trigger29 View Drop Down
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X = 180 Y = 90 (X+Pyro)+(Y-Pyro) = ?

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Posts: 2200 		  Quote trigger29 Quote  Post ReplyReply Direct Link To This Post Posted: November/28/2009 at 21:32
Originally posted by Urimaginaryfrnd

I would think it could take a little heat which if there is locktite involved might make a difference but err on the side of caution and go to the gunsmith.  Anyone who doesnt have a drill press and a lathe is probably not a real gunsmith.
A little heat to break loctite is probably ok, I didn't think of that. And +1 on a real gunsmith having the correct tools.

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