Lamps usually use a running pipe thread, like the 1/8" Iron Pipe (that's
what the IP stands for) that is most typical today.
What you had sounds like it *might* be 1/4" pipe. it has a major diameter
of 0.540 - just over 1/2", though its pitch is 18 TPI rather than the 20
pitch you tried.
There're also a (fairly rare) 3/8" pipe size that's occasionally encountered
in lamps or elsewhere - like old electrical stuff. Also 18 TPI.
An old hardware store or a good lamp repair shop should be able to fix you
up - or Google it...
Karl
----- Original Message -----
From: "John T. Blair" <jblair1948@cox.net>
To: <shop-talk@autox.team.net>
Sent: Thursday, July 17, 2008 8:00 PM
Subject: [Shop-talk] Lamp question
> We have an old brass lamp, over 30 yrs old. My wife wanted me to modify
> it.
> No problem I thought. But when I went to try and get a harp, yoke, and
> new
> socket, I found that they had changed the standard for the rods and
> sockets.
>
> The new standard is 1/8 IP. Anybody know what that is or means?
> I know it doesn't appear to cross to any usual nut or bolt.
>
> The old rod was about 1/2" in diameter and a 1/2" x 20 fits very loosely.
> So next question, anyone know what the old standard was?
>
> My wife managed to find an adapter at an old lamp shop in town the other
> day. It's like a union that has 1/8" IP on one end and the old standard
> on
> the other end. You won't find these at most of the local hardware
> stores though.
> We tried. :)
>
> TIA
>
> John
>
> John T. Blair WA4OHZ email: jblair1948@cox.net
> Va. Beach, Va
> Phone: (757) 495-8229
>
> 48 TR1800 48 #4 Midget 65 Morgan 4/4 Series V (B1106)
> 75 Bricklin SV1 (#0887) 77 Spitfire 71 Saab Sonett III
> 65 Rambler Classic
>
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> Bricklin: www.bricklin.org
>
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