Gallery, Projects and General > How do I??
snapped centre drill
kayzed1:
:doh: snapped a centre drill in a lump of Brass starting a 2mm hole, is it start all over again or is there a way to remove said tiddly bit of steel? i do hope so as it was the last of 12 tapping holes and no room to move the hole...Ta!
Lyn.
awemawson:
Of course I'd say use a sinker EDM machine as I have one :ddb:
... but you need to research if anything will dissolve steel and not adversely affect the brass - though nothing comes to mind
(or you could quickly make a 'tap dis-integrator' - they are very simple - google them ) At the simplest, a vertical armature with a copper tube running through it is attracted upwards into an electro-magnet. As the copper tube was resting on the victim and making the circuit, the armature falls back and the cycle continues - just like an electric bell or buzzer (though they use springs rather than gravity)
Ed ke6bnl:
I have herd that for aluminum and maybe brass Alum placed in the hole and maybe a dam for containing the fluid will eat away the steel. Never done it,never found the alum. maybe available at the pharmacy. EDM can remove it. and lets here from the ones who know. Found this on wikiAlum solution has the property of dissolving steels while not affecting aluminium or base metals, and can be used to recover workpieces made in these metals with broken toolbits lodged inside them.[5] As considerable expense and/or effort may have gone into machining a specialist part, this can be a worthwhile exercise.
krv3000:
hi well you can skim so much of the end of the brass bar to expose so much of the broken bit to get hold of it with sum thing to remove it or set to with a diamond coted bur that goes in a dermal and grind it out or get sum acid car battery acid works well stand the bare up right and mack a well to hold the acid and pore sum in and lave fore a week
Stilldrillin:
Lyn.
Can you drill through, from the other side?
Then tap the ensuing hole. Loctite/ solder in a screwed plug, and re drill.
I rarely use centre drills. Always use a spotting drill...... http://www.ebay.co.uk/itm/3mm-HSS-Co8-90-DEGREE-NC-SPOTTING-SPOT-DRILL-EUROPA-OSBORN-8214020300-D25-/271833566150?hash=item3f4a8b0bc6:g:THIAAOxyrx5TjwAq
David.
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