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Tool Talk Discussion Forum

Broken tap extraction

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Rick L.

05-14-2004 11:17:37

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I've got a 3/8 tap broken off in a hole in an engine block. Not enough left to weld a nut onto; is there a drill bit good enough to cut a tap?

Rick L.

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05-15-2004 16:19:52

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Re: Broken tap extraction in reply to Rick L., 05-14-2004 11:17:37

Guys have already suggested the Walton tap extractors. This is your best route. I would STRONGLY suggest to do this first. those units require the hole to be clean and the broken off end of the tap to be whole. I recently busted a #10 screw tap off in the bed of my mill and used one of these to remove it.

Use patience and read the directions and life will be good. You will need some sort of lubrication and a way to blow out any chips that may be in the hole.

HTH

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Davis In SC

05-15-2004 21:10:15

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Re: Re: Broken tap extraction in reply to jt, 05-15-2004 16:19:52

I agree with JT. I have been a tool & die -maker for 26 years. I burn most broken taps out on an EDM (Although I never broke any myself, LOL) But for large parts, I use the Walton extractors.The problem is that people try to use all methods to attempt to remove it, always damaging the mouth of the hole, making it very difficult to get the tap out. Same story with broken bolts..... they try to drill a hole in the bolt & it runs over into the casting, then you really have a problem !!!!! !!

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Bud in NC

05-14-2004 19:11:58

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Re: Broken tap extraction in reply to Rick L., 05-14-2004 11:17:37

Try this - I've got a set that I've used for years. You'll probably have to "copy & paste" the address but it'll give you a start on what you're hunting. Good luck!

Link

Oh yeah - if you try to break the tap out with a punch you may wind up with a bigger problem than the broken tap! Found that out the hard way!

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Rick L.

05-14-2004 18:45:35

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Re: Broken tap extraction in reply to Rick L., 05-14-2004 11:17:37

Lots of good suggestions; thanks. I'll start with the easy stuff first.

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kyhayman

05-14-2004 18:04:01

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Re: Broken tap extraction in reply to Rick L., 05-14-2004 11:17:37

I usually drill on 4 sides with a real small bit. Then drill oversize and helicoil.

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Bus Driver

05-14-2004 17:46:41

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Re: Broken tap extraction in reply to Rick L., 05-14-2004 11:17:37

EDM will take it out clean. But not many small machine shops have them. The part would need to be submerged in their tank while the tap is being burned out. Expensive too.

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T_Bone

05-14-2004 16:39:42

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Re: Broken tap extraction in reply to Rick L., 05-14-2004 11:17:37

Hi Rick,

I use a center punch and shatter the tap into pieces. On larger tap diameters you some times need to break the flute arm before tackling the center of the tap.

T_Bone

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Art

05-14-2004 13:01:56

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Re: Broken tap extraction in reply to Rick L., 05-14-2004 11:17:37

Call Walton @ 1860-523-5231 and ask for the name of a local distributor. Walton makes a pretty slick unit for removing broken taps.

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Robert

05-14-2004 11:44:10

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Re: Broken tap extraction in reply to Rick L., 05-14-2004 11:17:37

I think Snap On (maybe others) makes a tool specifically for extracting broken taps. There are "finger" like things that fit along side of the flutes of the tap, and they're hard enough to not break.
They do make a drill bit that will cut taps, but, I think it would be difficult to get the bit started so that you ended up with a straight hole, and not do more damage.
Good Luck!

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05-14-2004 18:25:42

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Re: Re: Broken tap extraction in reply to Robert, 05-14-2004 11:44:10

I know the tool you mean. We have a set at work. I've used them with mixed success. I'd look into it, if it works it's an easy way to get it out, if it doesn't, it at least won't make things worse.
I don't remember who made it.

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Van in AR

05-14-2004 11:42:44

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Re: Broken tap extraction in reply to Rick L., 05-14-2004 11:17:37

Go see the local dentist and ask him for some dental burrs that are no good to him because they are too dull to use. Put them in a rotary tool and cut it out. Works every time, the burr is harder than the drill bit or tap.

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Coloken

05-14-2004 11:28:07

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Re: Broken tap extraction in reply to Rick L., 05-14-2004 11:17:37

Nothing I know of hard nough. Cutting torch. Smallest tip you have. Hold on the tap til it is red. Hit the oxigen one quick burst. Break out any pieces left. I have done this on gun actions with a 8/64 tap several times.

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