[Noisebridge-discuss] Elevator gate: need steel square tubing

Henner Zeller h.zeller at acm.org
Sun Sep 13 18:39:20 UTC 2015


To make it possible to open the elevator gate with an RFID token, we
need to put an electric strike in the current 'door frame' which is
just a steel tube mounted to the wall.
I have a strike, but that won't fit inside the current steel tube
(which is about 1 1/4" square).

Jarrod and I were looking into the situation yesterday and concluded
that best would be to replace the tube (it also needs a little
re-arrangement to better fit the gate, which anyway requires is to
move mounting holes a bit).

The inner space in the tube needs to be about > 1" wide (the current
tube fits that), but about 1.5" deep for the strike to fit.
So for best results, we should replace the tube with a different one
that can comfortably hold the strike, I'd guess a 1.5" x 3" with
0.188" wall thickness (or even 0.120") would be a good choice. Length
roughly 7'.

Other suggestions welcome (mabye a 'real' door frame ? Different door
? But these options sounds way more expensive).

There is cold rolled and hot rolled steel, but I don't know what is
the best choice for this kind of application.
If someone knows a place where we can get something like this for
cheap, that would be great. If not, I'll check out options to get it
nearby or get it delivered.


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