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Tool Talk Discussion Forum

How can I get a broken tap out?

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unioncreek

05-27-2007 16:40:03




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I had to redrill one of the holes that holds the twine knife on my IH baler. I was almost done tapping the hole and the tap broke off. Is there any way to get that tap out? I tried using a center punch and slowly chip away at it, but it's a 1/4 inch hole and not a lot of room to work in there. Any help is appreciated.

Bobg




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L.C.Gray

05-28-2007 08:35:07




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 Re: How can I get a broken tap out? in reply to unioncreek, 05-27-2007 16:40:03  
There are tap removal tools made but they only work for the straight fluted taps. All I've ever seen are ones for 4 flute taps. If you're using a helix or 3 flute gun tap you're in for a lot of fun.

The best thing you can do is go find you a can of "Rapid Tap" or a similar tapping fluid to break the surface tension on the stuck tap first. Then use it when you complete your job later. You wouldn't believe what a difference it makes.

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Slowpoke

05-30-2007 01:12:09




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 Re: How can I get a broken tap out? in reply to L.C.Gray, 05-28-2007 08:35:07  
Tap extracters are available for 2 flute, 3 flute and the most common is 4 flute. Found in McMaster-Carr catalog. Might find them at Enco or other industrial and machinist supply, too. I used one to remove a broken Helicoil tap in a V8 intake manifold. Saved me $200.



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Chris(WA)

05-28-2007 05:05:46




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 Re: How can I get a broken tap out? in reply to unioncreek, 05-27-2007 16:40:03  
Use a dremel and a carbide or diamond bit to grind away the center of the tap then use a magnet and a small pick to remove the chips. Works pretty well. Just did one when another tech from our shop broke one off in a boiler.Three fluted tap so the tap remover tool would not work. They work well with four fluted taps though.



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CalJim

05-27-2007 21:07:28




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 Re: How can I get a broken tap out? in reply to unioncreek, 05-27-2007 16:40:03  
Try McMaster-Carr for the tap removers



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Areo

05-27-2007 18:43:44




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 Re: How can I get a broken tap out? in reply to unioncreek, 05-27-2007 16:40:03  
If it is a carbon steel tap just heat it red hot and cool it slowly and it will turn to butter and can be drilled out. If it's high speed steel there are tap retractors available, but it is still tricky.

HTH

Areo



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doublerocker

05-27-2007 17:03:18




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 Re: How can I get a broken tap out? in reply to unioncreek, 05-27-2007 16:40:03  
ive had luck using two drill bits held in visegrips,,put the bits down the flute and work it lose,,,might break a few but it may work if its not jammed too bad



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Spook

05-27-2007 17:57:57




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 Re: How can I get a broken tap out? in reply to doublerocker, 05-27-2007 17:03:18  
I have done something similar, but sure not with driss, some stiff wire is much better. One other thing, try usuing a short tap handle when tapping small holes. A 12in tap handle that will open up enough to grab a .500 or .750 tap might close up enough to grab a .250 tap, but it will give you too much torque when tapping, making it easier to break a tap.



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Spook

05-27-2007 17:53:23




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 Re: How can I get a broken tap out? in reply to doublerocker, 05-27-2007 17:03:18  
I have done something similar, but sure not with driss, some stiff wire is much better. One other thing, try usuing a short tap handle when tapping small holes. A 12in tap handle that will open up enough to grab a .500 or .750 tap might close up enough to grab a .250 tap, but it will give you too much torque when tapping, making it easier to break a tap.



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