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Broken tap removal tip


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#1 Bill 76 OFFLINE  

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Posted April 04, 2018 - 05:45 PM

After spending 4 hours machining  an aluminum sprint car part I needed to drill and tap 4  5/16  18 holes I chucked the part up in the Bridgeport mill and proceeded to drill 4 blind holes all good so far , Then power taped 3 holes and on the fourth hole the tap broke :mad2: . Just great  so I spent several hours trying to remove it I was ready to toss it and make another part . I googled tap remove to see if there was any latest and greatest way to remove it and came across using Alum , A spice used in making pickles . It seems that it dissolves steel, iron and other ferrous metals and not harm aluminum . Went to store got 3 small jars of Alum , mixed it with water in an old glass coffee maker pot  put the part in  and turned on the coffee maker to heat the pot . Lo and behold the tap was gone the next day :D. I was amazed .

Just remember it will eat steel and iron and such.

Thought I would pass this on ,  

 

                                    Bill     


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#2 MFDAC OFFLINE  

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Posted April 04, 2018 - 08:05 PM

That's pretty amazing! If it's that strong it makes me wonder what all the pickles I eat does to my gut---oh well won't quit eating them anyway.

 

Thanks for the tip.

 

DAC


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#3 SupplySergeant ONLINE  

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Posted April 04, 2018 - 09:02 PM

I'll have to try this at work. I constantly break 4-40 taps in aluminum. I can run 1-72 and 0-80 all day, 6-32 and 1/4-20 too easy. But I go through about three 4-40 taps a month!


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#4 Cvans OFFLINE  

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Posted April 04, 2018 - 10:08 PM

But I go through about three 4-40 taps a month!

 

Have you tried any different types of tap or cutting fluid?


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#5 Bill 76 OFFLINE  

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Posted April 04, 2018 - 10:11 PM

Supply Sergeant-- It should work fine for you just make sure the parts are clean of oil and cutting fluid . It seems that it is an old watch makers trick.

Yeah it was my fault it broke , hole got jammed with chips  , should have backed it out and given it a shot of air 

0-80 good lord , I can break them just looking at em 


Edited by Bill 76, April 04, 2018 - 10:28 PM.

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#6 Bill 76 OFFLINE  

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Posted April 04, 2018 - 10:24 PM

Cvans , I have rapid tap and tap magic but usually use wd40 when working aluminum always had good luck with it. It seams to be about the only thing that wd40 is any good at , but it was my fault it broke it got jammed with chips in the bottom of the hole , should have backed it out and hit it with air but being the last hole I guess I just was in a rush to finish the part.


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#7 Sawdust ONLINE  

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Posted April 04, 2018 - 10:32 PM

I've never heard of this but will try it just to see how it works. Don't you just wished you had that one last second back when they snap. My wife makes pickles every year...now I'm wondering.

Edited by Sawdust, April 04, 2018 - 10:33 PM.

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#8 secondtry OFFLINE  

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Posted April 05, 2018 - 02:08 AM

   Will this work on a snapped off bolt in a transaxle. Don


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#9 Jazz OFFLINE  

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Posted April 05, 2018 - 06:19 AM

That's good to know. Don't think I ever had issue with aluminum. When I break a tap its usually in some ugly location I can barely access.


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#10 chieffan ONLINE  

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Posted April 05, 2018 - 07:40 AM

Great idea.  Wonder if it has to heated to work?  Cub Cadet get the rear end mounting bolts broke off a lot.  Tip it on it side and build a dam around the hole and fill it with the mixture?  Just thinking ahead.  (Would not want a through hole though)


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#11 SupplySergeant ONLINE  

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Posted April 05, 2018 - 07:44 AM

Have you tried any different types of tap or cutting fluid?

 

I've tried everything from old lard-based cutting oil to high-dollar tap fluids. Tap Magic EP Extra seems to be my best bet. My real issue is that I work for physicists who need everything small and vacuum-tight, and often 4-40 is the biggest thing that fits, but it has to be tapped 1/2" or more to work. I've just received some OSG form-type taps, they promise to be much stronger.

 

Supply Sergeant-- It should work fine for you just make sure the parts are clean of oil and cutting fluid . It seems that it is an old watch makers trick.

Yeah it was my fault it broke , hole got jammed with chips  , should have backed it out and given it a shot of air 

0-80 good lord , I can break them just looking at em 

 

I sure hope so, last week I broke one in a part that had about 20 hour of work on it, and it was a modification of an existing part. I got luck and removed the tap with a modified set of needle-nose pliers.

 

0-80 requires GOOD taps, I buy OSG Exotaps for them. About $25 each, but the parts I put 0-80 holes in are worth thousands, so it's worth it.


Edited by SupplySergeant, April 05, 2018 - 07:45 AM.

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#12 LilysDad ONLINE  

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Posted April 05, 2018 - 09:00 AM

I can't imagine manufacturers breaking taps as often as you guys do.


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#13 SupplySergeant ONLINE  

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Posted April 05, 2018 - 09:20 AM

I can't imagine manufacturers breaking taps as often as you guys do.

 

They don't! I work on one-offs, mostly odd shapes and positions, and typically hand-tap. Manufacturers use application-specific taps, in specialized machines, and often take weeks setting up a new machine. All that makes for MUCH better survivability for cutting tools.


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#14 secondtry OFFLINE  

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Posted April 05, 2018 - 11:08 AM

Great idea.  Wonder if it has to heated to work?  Cub Cadet get the rear end mounting bolts broke off a lot.  Tip it on it side and build a dam around the hole and fill it with the mixture?  Just thinking ahead.  (Would not want a through hole though)

  That is exactly what I am thinking. Maybe even drill a center hole to speed the process.  A through hole would require total disassembly. Has any one tried any thing like this. Don  



#15 DougT ONLINE  

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Posted April 06, 2018 - 01:52 PM

   Will this work on a snapped off bolt in a transaxle. Don

 

Should if you can get it in your coffee pot. Seriously, you would need to be able to soak it and it could only be the aluminum and what you're trying to take out. Anything metal will be gone.


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