Making Board And Batten Shutters
MAKING BOARD AND BATTEN SHUTTERS – QUICK SHADE CANOPY TENT – SHADE FLOWER BED
Making Board And Batten Shutters
- (shutter) a hinged blind for a window
- Close (a business)
- (shutter) close with shutters; "We shuttered the window to keep the house cool"
- (shutter) a mechanical device on a camera that opens and closes to control the time of a photographic exposure
- Close the <em>shutters</em> of (a window or building)
- devising: the act that results in something coming to be; "the devising of plans"; "the fashioning of pots and pans"; "the making of measurements"; "it was already in the making"
- Money made; earnings or profit
- Essential qualities or ingredients needed for something
- (usually plural) the components needed for making or doing something; "the recipe listed all the makings for a chocolate cake"
- The process of <em>making</em> or producing something
- qualification: an attribute that must be met or complied with and that fits a person for something; "her qualifications for the job are excellent"; "one of the qualifications for admission is an academic degree"; "she has the makings of fine musician"
- furnish with battens; "batten ships"
- a strip fixed to something to hold it firm
- batting: stuffing made of rolls or sheets of cotton wool or synthetic fiber
- A long, flat strip of squared wood or metal used to hold something in place or as a fastening against a wall
- A strip of wood used for clamping the boards of a door
- A strip of wood or metal for securing the edges of a tarpaulin that covers a ship's hatch
- The stage of a theater
- get on board of (trains, buses, ships, aircraft, etc.)
- a stout length of sawn timber; made in a wide variety of sizes and used for many purposes
- A long, thin, flat piece of wood or other hard material, used for floors or other building purposes
- A thin, flat, rectangular piece of wood or other stiff material used for various purposes, in particular
- a committee having supervisory powers; "the board has seven members"
making board and batten shutters – Richwood Black
Well, this shutter model, whose manufacturer shall remain unnamed to protect the guilty, opens and shuts fast (less than 1 ms). It is built with (mostly) ultra-high vacuum techniques (spot welding, viton, stainless steel, etc.). It even features a copper ribbon "heat sink" that is somewhat attached to the relay coil. It’s mounted to a copper "sled" I had the JILA machine shop make, which is bolted to a feedthrough based on a 3-3/8" ConFlat flange. It was originally designed as a laser shutter, so I suppose we deserve whatever FAIL we get by trying to use it in any other way.
1) The shutter’s driver pulses on ~60V to get the blades moving and then outputs a steady hold current as high as 400 mA (at 5V)… meaning that 2W are being dissipated in the potted (!), mostly insulated coil in vacuum. Good god. I built a little circuit that shunts away about half that current (so 3/4 of the power) which still manages to hold it shut, but even then the coil temperature reaches 70°C (and its resistance goes up by ~10%).
The damn things (three out of three so far) fail shut after a moderate 80°C bakeout and about 2 days of continual 1Hz periodic actuation. It doesn’t inspire much confidence in us being able to install one in our experiment and use it for up to 2 years without service. And of all failure modes to exhibit… I mean, we wanted the "normally open" design so that in the worst case scenario we’d at least get atoms through a disused but open shutter. Banging on the vacuum system seemed to dislodge the stuck blades. Welcome to research at the cutting edge.
My driver modification wasn’t the cause because we’ve seen failures at all sorts of hold current levels between the absolute lowest that would work, and the original factory value. A modified shutter design has just arrived from the factory featuring lots of teflon (plumber’s?) tape wrapped around the viton bumpers (see notes on image). It is currently under testing; no failures yet but the outgassing is about 1 order of magnitude higher (7 x 10^-7 Torr while operating, 1 x 10^-7 Torr just sitting there obnoxiously). Grar.
Home-made shutter release for my Canon EOS Digital Rebel XTi