Re: [mh] DIY door opener

[Thomas H. <tho...@ve...>]

I used to like VR, but I find myself having to say just about everything 
twice before MH gets it. Still has the "wow" factor, but finger print 
readers usually work on the first try. We have a pushbutton electric combo 
for our front door, but that is so "80's" :) Finger print or retna scan 
would be sweet!


----- Original Message ----- 
From: "Joel Davidson" <jr...@io...>
To: <mis...@li...>
Sent: Tuesday, May 02, 2006 6:21 PM
Subject: Re: [mh] DIY door opener


> Nah, use voice recognition.
>
> On Tue, 2 May 2006, it would appear that Thomas Harding wrote:
>
>> MessageI think if anyone is going to put in automatic doors, they should 
>> put in something like Star Trek sliders with a finger print reader to 
>> open them :)
>>
>>
>>  ----- Original Message -----
>>  From: Jim Serack
>>  To: mis...@li...
>>  Sent: Tuesday, May 02, 2006 11:56 AM
>>  Subject: RE: [mh] DIY door opener
>>
>>
>>  Dave,
>>
>>  How many doors are you going to do? If it's one - I think I would give 
>> them their money and enjoy the warrantee and support - but if it's many 
>> it would seem the pneumatic route meets your need of low resistance when 
>> the door is not being automatically opened - but there is the overhead of 
>> the compressors and valves to put somewhere. The pneumatic route would 
>> also give you options as to sliding doors, and even other motions that 
>> might not be doors... (like a lowering something from a height?)
>>
>>  Compressed air actuators, controls, etc. are a mainstay of many 
>> manufacturing lines (like systems that shuttle PC's under construction 
>> around assembly plants (e.g. Dell), integrated circuit manufacturing, and 
>> systems that package products for consumer goods (e.g. 6 bars of soap in 
>> a savings pack))- if you wanted to go DIY as a technology it would have 
>> the greatest availability of parts, controllers, etc. Used parts on ebay 
>> go for $50 per cylinder like in the picture. It would also be within most 
>> peoples reach for tools to work the customization - like making mounting 
>> brackets, etc. Has the lowest electrical hazard etc.
>>
>>  You said it was for new construction - if so is there an opportunity to 
>> put - large conduit from above the doors to an equipment room and put a 
>> compressor there, could you hide larger (more available) cylinders above 
>> the door? A good size air compressor and storage tank somewhere would 
>> likely handle several door opening and closures without running all the 
>> time - and with battery backup of your controller the stored compressed 
>> air would work for a while during power interruptions. The combination of 
>> an air regulator could also limit the doors crushing / entrapment safety 
>> issues. From a simple design perspective you could use a regular 
>> hydraulic closer, and a one way push open pneumatic cylinder for opening, 
>> with limited force (the regulator) which would just require one value and 
>> open control signal to open. For door latches you would probably still 
>> use electric striker plates from the security industry - and yes you 
>> could probably code in mrhouse to control it all.
>>
>>  Jim
>>    -----Original Message-----
>>    From: mis...@li... 
>> [mailto:mis...@li...] On Behalf Of David 
>> Norwood
>>    Sent: May 2, 2006 3:46 AM
>>    To: mis...@li...
>>    Subject: RE: [mh] DIY door opener
>>
>>
>>    Thank you for your responses to my question about automatic door 
>> openers.  I am still looking for a solution that is easy to install.  Can 
>> anyone recommend any suppliers for either pneumatic or motorized 
>> actuators?  The only ones I can find are from disablity companies, and I 
>> think the markup is high.  Maybe they have done integration and design 
>> work that is worth it.  What do you think?
>>
>>    Here are three examples:
>>
>>    http://www.disabilitysystems.com/residential.html
>>    $1000, pneumatic (requires air compressor), has sophisticated 
>> controller
>>
>>    http://www.opensesamedoor.com/
>>    $1600, motorized actuator
>>
>>    http://www.privatedoor.com/selection/executive.htm
>>    $1400, small motorized actuator, nice latch release
>>
>>    David
>
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