Removing broken tap in non ferrus.

[kellswaterri]

Hi all,
this may not apply to watch or clock makers, if not please move it...has anyone ever used (ALUM) or potassium aluminum sulphate to remove a corroded screw or a broken tap in a blind hole...apparently this only works with non ferrus material...
All the best for now,
John.

 

[Ray C]

It works best on carbide taps -and yes, I've used that trick and it works. Make a paste and put the part in a warm place just enough so the paste doesn't dry up too fast. Keep it damp for at least 4-6 hours -overnight if possible -the longer the better. The carbide will crumble when you pick at it.

I'm not sure if this works with HSS-type taps.


Ray

Hi all,
this may not apply to watch or clock makers, if not please move it...has anyone ever used (ALUM) or potassium aluminum sulphate to remove a corroded screw or a broken tap in a blind hole...apparently this only works with non ferrus material...
All the best for now,
John.