I've read that black oxide drills should not be used on non-ferrous metals like
aluminum. I don't know if or why this is true. Any insights ?
Thanks,
Doug
----- Original Message -----
From: "SteveH" <[email protected]>
To: "R/C Tank Combat" <[email protected]>
Sent: Wednesday, August 4, 2010 12:21:37 PM
Subject: [TANKS] Re: drills - black oxide vs titanum tipped
On Aug 4, 1:21 am, Ben Holko <[email protected]> wrote:
> for a 1/2" hole 3-4mm thick in aluminium any general purpose bit designed for
> wood/steel will work, just go slow and use some cutting lubricant.
>
Two other pieces of useful advice:
1) Use a drill press, and clamp the workpiece to the table, if you
want accurate hole positioning. Hand-held drilling is right out of it.
2) For large holes, center-punch the location and start with a smaller
drill (say, 3/16), and proceed upward in size by increments. Leave the
fixturing and clamping in place during this process. You'll get less
tool wander by starting with a small drill bit that gets "captured" in
the dimple made by the center punch than by starting with a big drill.
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