[Amps] Want to use a knob with a 3/8" opening on a 1/4" shaft.

[k7rdx]

Most bearing supply outlets will have various bushings in stock...1/4-3/8 is
a common size, another source is an industrial machine shop..(It helps to
have a friend that does this kind of work) Hope everyone on this list has a
super Christmas and better 2006..Jim K7RDX..
----- Original Message ----- 
From: "Bill Turner" <dezrat1242 at ispwest.com>
To: "W0UN -- John Brosnahan" <shr at swtexas.net>; <w7jk at verizon.net>
Cc: <amps at contesting.com>
Sent: Friday, December 23, 2005 8:00 AM
Subject: Re: [Amps] Want to use a knob with a 3/8" opening on a 1/4" shaft.


>
> ORIGINAL MESSAGE:
>
> At 03:03 AM 12/23/2005, W0UN -- John Brosnahan wrote:
> <snip>
> >finding some 3/8 brass rod and drilling a 1/4 inch hole in it -- plus
> >clearance holes
> >for the set screws.  Easier on a lathe, but with care a drill press
> >will do it.
> <snip>
>
>
>
> ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>
> This brings up a question for you machinists out there.
>
> I once watched a program on the Discovery Channel which showed how
> rifle barrels are made. It said in order to drill a perfectly
> centered hole in a rod, you clamp the drill bit stationary and rotate
> the rod as if it were the drill bit. Done this way, the rod will
> automatically center itself around the drill bit.
>
> Is this true or just an old (machinist's) wives's tale?
>
> 73, Bill W6WRT
>
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