The Murphy Builders Site

I used to use common carbide masonry drills and put up with the fact that
they drill oversized holes. Then I tried cobalt impregnated drills and they
will drill through just about anything as long as they are fed some
lubricant while cutting. At one time these were expensive, $50 for a set
from 1/16 to 3/8, but like everything else they have become cheap.

Stay away from the gold titanium coated drills. The current crop appears to
be very cheap steel dipped in gold paint.

Gary Wolf


----- Original Message -----
From: <schaumr@dcsol.com>
To: <rebel-builders@dcsol.com>
Sent: Monday, August 30, 2010 12:18 PM
Subject: [rebel-builders] Drilling through steel leaf springs:
work-hardening

Hi All,

Tried to drill through my steel tail spring this morning but managed to
render
half the hole "work-hardened" (not enough lube and/or cooling). What do I
do now? Carbide tipped bits? Other bits?

Hope someone can help me avoid buying a new tail spring!!

Rob
Rebel 786

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