Interesting, a 2002 msg has resurfaced!
For something that small, the most reliable way to get the broken
drills out is chemically. Aluminum is pretty much non-reactive to
acids, steel is reactive. Thus, the classic approach of dissolving
the broken tool out with a strong, hot alum solution. Swimming
pool/Spa & garden supply places sell alum for lowering pH.
Roy
--- In 7x12minilathe@..., "machinest80" <machinest80@...>
wrote:
--- In 7x12minilathe@..., "Capt Ken Appleby"
<captkenn@> wrote:
Hi,
This might sound a bit basic but it has stumped me! While
drilling
on
my lathe, I have broken two 2mm drills in two separate holes in a
steam engine alluminium casting. They have both broken off flush
so
there is nothing to get hold of and there is not a lot of space
around them. I have thought of over-drilling the whole lot out
(if I
can) and making a screw-in plug and milling it flush.
Is the casting a write-off - Or is there another way?
All help appreciated
Regards
Ken
Hi,
When drilling aluminium a good cutting fluid is a must, this kind
of
metal welds to the drill bit quick.
