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

Torrie Fischer tdfischer at hackerbots.net
Sun Sep 13 18:50:59 UTC 2015

Discount Builders would have a selection of steel square tubing to do this, 
though maybe not at the proper length. The Lowes' on bayshore /might/ have 
some longer lengths, or more likely a local home depot. Most other local 
vendors like BayShore Metals are closed today.

Cold rolled steel is essentially hot rolled steel with some further processing 
(and expenses) to increase tensile strength and reach precise shapes and 
tolerances. I don't think we need cold rolled steel for our door frame :)

On Sunday, September 13, 2015 11:39:20 AM Henner Zeller wrote:
> Hi,
> 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.
> -h
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