[Noisebridge-discuss] [Rack] Electric door strike working again. Use your Pin or key to get in.

Jonathan Lassoff jof at thejof.com
Mon Jul 15 07:22:08 UTC 2013


Yeah, so what's the new motor? I haven't been by in a few days.

Is this just another buzzer, or some kind of rotationally-driven mechanical
actuation?

Either way, sounds like some cool progress is being made.
Awesome!

On Sunday, July 14, 2013, Henner Zeller wrote:

> On 14 July 2013 20:53, Martin Bogomolni <martinbogo at gmail.com<javascript:;>>
> wrote:
> > Quick thing--
> >
> > Remember that Fire Code requires that any electric door strike, or
> > magnetic strike, must allow someone to leave without being impeded in
> > a panic.  On magnetic doors, this requires a panic push bar that
> > physically breaks the electrical connection.   On mechanical electric
> > strikes, this requires that either a pushbar or simple lever be
> > pushed/rotated to bypass the electrical lock.
>
> The regular lock will just work the way it is now - by rotating the lever.
>
> -h
>
> >
> > -M
> >
> > On Sun, Jul 14, 2013 at 10:41 PM, Jake <jake at spaz.org <javascript:;>>
> wrote:
> >>> The motor Scotty found takes about 300mA at 6V when free-running (so
> >>> for no-load 'return', maybe 500mA with load). It runs about 1 second
> >>> for the amount of time we need. That is about 1.8 Joules.
> >>> Say we can charge up a capacitor to 18 V (peak voltage of a bit more
> >>> than 12 V AC) and drain it down to 4 V (when this particular motor
> >>> just works), then we'd need about 20'000 microfarad ( 2 * 1.8 joules /
> >>> ((18 - 4) volt)^2 ). The calculation would be similar for other
> >>> motors found in the pile.
> >>
> >>
> >> there are at least ten 1000 microfarad capacitors rated at 50 volts in
> the
> >> pile, and i can certainly find more.  But i think the math is more
> >> complicated.  But since it's based on voltage squared, one 50 volt 1000
> uF
> >> capacitor is the same energy as a 20,000 uF capacitor rated at 11.1
> volts.
> >>
> >> anyway that motor sounds hella weak.  The motor i already mounted on the
> >> door is rated 24 volts and probably can take a good amp or two at least,
> >> which is a lot more power.
> >>
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