[TheForge] Re: Punching and drifting angled holes

[Grant Marcoux]

Ms. Ekaterina:  You are welcome.  "OC" means "on center"  which is the dead
center point of the hole, which allows for the radius of the inserted
bar/picket on either side.  Blocking refers to shaping the drifted hole
around a drift the same size, roughly, as the picket to be inserted.  To do
this, you must:

examine the drifted hole to ensure it is congruent on all sides.  Look at
the swollen "pooch" left by drifting and make sure it looks the same all the
way around.  There is a very good chance it will not be perfect.

At a low red heat, with the drift in place, using a flatter and neck fuller,
shape the flats and corners of the pooch.  Do not hit the pooch directly
with the hammer.

Grant

-----Original Message-----
From: theforge-bounces at mailman.qth.net
[mailto:theforge-bounces at mailman.qth.net]On Behalf Of Ekaterina Harrison
Sent: Monday, May 19, 2008 10:08 PM
To: theforge at mailman.qth.net
Subject: [TheForge] Re: Punching and drifting angled holes


Grant,

Thank you, this is a good idea.

When you refer to OC do you mean opening center?
Please excuse my lack of knowledge with some of these terms, but I am
pretty much self taught in blacksmithing and simply don't know some of
the terminology.
What do you mean by blocking?

What I did is I made a triangular profile jig for my power hammer to
line up my piece for punching and then punched the hole all the way
through the piece finishing it of on the anvil.  Honestly, it was
beyond me how I was going to figure out where this hole was to come
out on the other side. This has worked fairly well for me except on a
few occasions the hole has wandered sideways on me.  I like the idea
of working it  from both sides as one would do with a perpendicular
hole.
It's times like these that  I wonder "why didn't I think of that!?"
This is when it is so great to be able to talk to others that have
also tackled similar challenges.

Thanks,
Ekaterina

On May 19, 2008, at 4:03 PM, theforge-request at mailman.qth.net wrote:

> ------------------------------
>
> Message: 8
> Date: Mon, 19 May 2008 13:23:55 -0700
> From: "Grant Marcoux" <gblacksmith at alamedanet.net>
> Subject: RE: [TheForge] Punching and drifting angled holes
> To: "Blacksmithing List Sponsored by ABANA" <theforge at mailman.qth.net>
> Message-ID: <MBEHKKCHPGMAODOPBFHKEEDKDHAA.gblacksmith at alamedanet.net>
> Content-Type: text/plain;	charset="windows-1250"
>
> Ekaterina:   The way to do this is by slitting an offset and then
> drifting
> at an angle.  First, locate the OC location of the hole.  Second,
> mark this
> location on BOTH sides o the bar and slit to one side of the mark on
> the
> "top" (upward facing) side of the bar and then slit to the opposite
> side on
> the "bottom" (downward facing) side of the bar.  These slits are
> each HALF
> of the required total slit length.
>
> It is advisable to first round drift at your required angle and then
> finish
> at that angle with a drift of final profile.   Blocking looks nice
> here.  If
> you just straight slit the bar, you will not be able to get a true
> 45 w/o
> puckering the bar at the slit
>
> Grant

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