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Home Model Engine Machinist > Building Them > Mistakes, Blunders and Boo Boos > Worn Tap Broken

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Old 12-22-2016, 04:44 PM   #11
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Problem with stainless is it galls or packed into the tap flutes then you basically won't get the tap safely out. Lots of lube and patience is the only way to tap stainless for me, I don't know how many stainless bolts etc I screwed up before I figured this out.


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Old 01-25-2017, 09:28 PM   #12
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The best way to remove broken taps is don't break them. DO NOT USE CARBON TAPS. They are like peanut brittle and snap off if you look at them wrong. Use HSS or cobalt


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Old 01-25-2017, 10:16 PM   #13
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Machine,

Don't write off carbon taps and dies, I have been using them for stainless threading for many years and never had one break.

What you have to remember is that there are carbon taps and CARBON TAPS. The ones I use are a lot more expensive than your general HSS ones, and I even have a metric set up to 6mm that must be 30 years old by now, and still going strong.

I won't use anything else on stainless.

John
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Old 01-26-2017, 11:39 AM   #14
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this is My answer about broken tap

http://www.waltontools.com/products/remvtap.htm
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Old 01-26-2017, 01:51 PM   #15
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Al, if you are going to make a habit of building more little engines or breaking taps off down holes, or even wanting funny shaped holes boring through some metal, then maybe you should consider a spark erosion machine.

I put the plans for one here in the downloads section many moons ago.

http://www.homemodelenginemachinist....roder-240.html

It was about 10 years ago when the plans and article were first introduced to the world (not by me BTW), so expect the cost for the raw materials to have doubled in that time. But still worth the overall outlay.
I have never made one, as I had a friend who took anything like that into work for me to have the weird shaped holes put through parts (machine was used to put holes into jet engine guide vanes for fuel and cooling), but now he has retired, maybe I should be looking at making one for myself.

John
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Old 01-27-2017, 05:28 AM   #16
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Quote:
Originally Posted by stragenmitsuko View Post
As a last resort , I've managed to remove broken taps on occasion with one of these . With a ball nose end that is , not tapered ones .

Don't know what they are called in english .

Pat
In Canada we call them a Burr
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Old 04-08-2017, 11:33 AM   #17
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You can resharpen your taps by grinding the flutes
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Old 04-11-2017, 06:31 AM   #18
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Quote:
Originally Posted by Blogwitch View Post
Machine,

Don't write off carbon taps and dies, I have been using them for stainless threading for many years and never had one break.

What you have to remember is that there are carbon taps and CARBON TAPS. The ones I use are a lot more expensive than your general HSS ones, and I even have a metric set up to 6mm that must be 30 years old by now, and still going strong.

I won't use anything else on stainless.

John
what taps and dies do you use please John - are they still available to buy
thanks,
David
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Old 04-11-2017, 07:00 AM   #19
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Hi John,

For most of my taps and dies I use these people.

http://www.tapdie.com/

Rather expensive for what they are, but they cut through stainless as though it was just brass or aluminium. Over the years I have managed to get complete boxed sets for all the threads I am liable to use.

John


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