broken tap

Charlie M · Oct 16, 2021

I've got a broken 5/16 broken tap I've got to remove from where it broke. There isn't enough sticking up to get an extractor to work. Any other tricks other than drilling it out to get it out. Are they hard to drill out. Its in the hole of one of the bolts holding the peddle guard on my 100 so at least I can remove the peddle base to get it to a better work area.

gtractorfan · Oct 16, 2021

Taps are too hard to drill. Years ago in a toolroom I used to use an EDM machine (electrical discharge) to erode them. Your best bet might be to use a punch to try to turn it.

rlp in Co. · Oct 16, 2021

I broke a tap once and I used a small punch to turn it. It took about4 hours, but I finally got it out!

gene bender · Oct 16, 2021

die grinder with small bit would the only way they just cannot be drilled [probably will just let it there awful small to work with it is broke so that means it is stuck fast tight

Bob Bancroft · Oct 16, 2021

Oxy/acetylene cutting torch, maybe in combination with other methods mentioned.

John Deere D · Oct 16, 2021

I've used these Extractors many many times with great results.........

NOW if the TAP was bottomed out....????

Blast hole with air ....

Added Kroil Penetrating fluid.....

Bob...

560Dennis · Oct 16, 2021

Two flute ,three or four flutes ?
Were you cleaning out threads or tapping them .
Braze an 1/4 inch Allen head cap screw on ito turn it out. Have to see it
Other wise edm tap extraction as mentioned

Bret4207 · Oct 16, 2021

If you can heat the whole thing up to a red heat and let it cool the tap will soften. It's much easier to grind out with a burr then or even drill if you have some real good drill bits. A tap extractor may work if you can access one. I have a set for #6 and 8 screws and I've never had any luck at all with them. I have shattered them with a punch, (didn't soften them those times, leave them hard), where the item being threaded was ductile and heavy enough that pounding on it wasn't danger for cracking it. DON'T try that on a cast item.

M-MAN · Oct 16, 2021

If you have a torch get it red and throw cold water on it. Then hit it with a punch and it will shatter like glass.

Bob Harvey · Oct 16, 2021

Ditto

Steve@Advance · Oct 16, 2021

Since the part can be removed, and if it is such a shape it can be held secure in a vise or clamped down to the table, it can be drilled out with a carbide end mill in a vertical mill (Bridgeport).

flying belgian · Oct 16, 2021

I just do not know what a peddle guard on a 100 is but I assume you are screwing in a 5/16 cap screw. Can you just drill and tap a new hole right aside it and leave the broken tap in there.

37 chief · Oct 16, 2021

Can you pound it out through the bottom, with a good punch? If so, install a helicoid. Stan

Stephen Newell · Oct 17, 2021

As a last resort sometimes you have to drill around the tap with a small drill bit until you can remove the broken tap with a pick. Then drill and tap the hole to a larger size.

1948CaseVAI · Oct 17, 2021

Since you can remove the part and it will be a manageable size just take the whole part to a good machine shop and let it be their problem. A good machinist will know what is best to do.

Jerrycpp · Oct 17, 2021

An old machinist told me this trick. I've done it and it works, but it is a scary thing to do. Taps are high-carbon steel, so you can actually blow them out with your cutting torch. Get the end of the tap super hot just like you would if cutting normal metal, hit the oxygen, and it will blow the tap out without hurting the surrounding area. Yes, it's sound screwy, but I have done it on occasion, and it works. You're left with an undamaged hole, with a few pieces of slag inside that you can pick out.

dr sportster · Oct 17, 2021

As pictured below Walton tap extractor set

BarnyardEngineering · Oct 18, 2021

I used a small diamond hole saw to core around a broken bolt extractor once and then tapped the hole for the next size larger bolt. Might be an option if you get desperate.

Fatjay · Oct 18, 2021

Had a broken tap the other day, there was nothing to grab, and it was a fairly small tap. Ended up taking it out in pieces after hammering with a punch to break it up.

Paul from MI · Oct 18, 2021

If you can get the part off, take it to a machine shop with an EDM machine. Best solution, no damage to an old unreplaceable part.

timcasbolt · Oct 18, 2021

(quoted from post at 20:21:16 10/18/21) If you can get the part off, take it to a machine shop with an EDM machine. Best solution, no damage to an old unreplaceable part.

his is an accurate answer, but I believe it needs to be noted that anybody with a sinker edm is going to expect good money to push the go button.

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