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Author Topic: Airflow featherswitch option Brad Miller Administrator Posts: 17775 From: Plano, TX (36.2 miles NW of Rockwall) Registered: May 99 posted 06-07-2008 04:02 PM                     Anyone have a recommendation for a better airflow featherswitch than the one that comes with SLC consoles? From time to time I find that it will get sucked right up into the exhaust stack. Granted I have beefed up the CFM to get better lamp life, but still, any recommendations?  |  IP: Logged Mark Gulbrandsen Resident Trollmaster Posts: 16657 From: Music City Registered: Jun 99 posted 06-07-2008 05:59 PM                     While I have not had the problem of the airflow "flag" comming off even with very high exhaust rates you could look into a pressure type of switch. The old H40's used to use a preswsure type switch for the internal blower system that I believe took about 1 inch of static pressure to operate it. I can't say that I've ever had to replace one. I believe Grainger sells similar switches. Mark  |  IP: Logged Steve Guttag We forgot the crackers Gromit!!! Posts: 12814 From: Annapolis, MD Registered: Dec 1999 posted 06-07-2008 07:58 PM                     The only thing that caused the pressure switch to fail was the tubing that fed the switch...it would collapse. Change the tubing, all was well. Brad, you could always use Strong's Ultra-80 sail switch or just make it yourself. It is nothing more than a lever type switch with some metal affixed to the end. The Ultra-80 one needs something like 600cfm or so to pull up...its flag is about 1"x1". Steve  |  IP: Logged Louis Bornwasser Film God Posts: 4441 From: prospect ky usa Registered: Mar 2005 posted 06-07-2008 08:26 PM                        Biggest problem in some Christies is that there is no "stop" for the switch paddle to hit. Constant oscillation kills the switch. Louis  |  IP: Logged Tim Reed Better Projection Pays Posts: 5246 From: Northampton, PA Registered: Sep 1999 posted 06-07-2008 10:07 PM                       quote: Mark Gulbrandsen I have not had the problem of the airflow "flag" comming off Oh, of course not.  |  IP: Logged Tristan Lane Master Film Handler Posts: 444 From: Nampa, Idaho Registered: Feb 2002 posted 06-07-2008 11:10 PM                     I 2nd the suggestion by Steve G. That switch is much heavier duty than the flimsy one on the SLC. Oh and Brad, can we get a "pissing contest" emoticon? It would be much funnier when people start to take stabs at others that way. Plus Mike Heenan would have some other emoticon to use than the sleeping one!  |  IP: Logged Brad Miller Administrator Posts: 17775 From: Plano, TX (36.2 miles NW of Rockwall) Registered: May 99 posted 06-08-2008 12:09 AM                     Anyone have a Grainger link? The funny part here is that I took Mark's advice and beefed up the airflow. Yes I get better lamp life now, but the "feathers" get sucked right off of the arm...and yet Mark has never had this problem???  |  IP: Logged Mark Gulbrandsen Resident Trollmaster Posts: 16657 From: Music City Registered: Jun 99 posted 06-08-2008 11:17 AM                     The only time I see this is when the switch fails and the kiddies mess with it to bypass it. Hint: One can put a little glyptol or loc-tite on the spot where it clips to the switch. This more or less guarantees it isn't going anywhere. I'll see about the Grainger link in a while... Breakfast First! Mark  |  IP: Logged Brad Miller Administrator Posts: 17775 From: Plano, TX (36.2 miles NW of Rockwall) Registered: May 99 posted 06-08-2008 03:05 PM                     It's not the wire, it's the "sail" part that comes off.  |  IP: Logged Phil Hill I love my cootie bug Posts: 7595 From: Hollywood, CA USA Registered: Mar 2000 posted 06-08-2008 03:21 PM                  You NEED to get some Mighty Putty ...that and a broken burger-flipper blade for a sail will solve your problem... quote: Our Grand-Poopie-BAH Anyone have a Grainger link? Ummm... Google it!  |  IP: Logged Mark Gulbrandsen Resident Trollmaster Posts: 16657 From: Music City Registered: Jun 99 posted 06-08-2008 04:10 PM                     Grand Poobie- Bahs multi use pressure sense switch This ought to work and its an all in one positive pressure, negative pressure and differential pressure.... What more could one want in a switch??? Louis will appreciate the fact that it will not flutter or malfunction due to shock and vibration... he has had some flutter problems so he says...  |  IP: Logged Phil Hill I love my cootie bug Posts: 7595 From: Hollywood, CA USA Registered: Mar 2000 posted 06-08-2008 04:16 PM                  Hmmmm...my pea-brain is getting confused. Is the switch in question a paddle-type "sail" switch or an Air Pressure Differential type? I thought it was a "sail" type.  |  IP: Logged Mark Gulbrandsen Resident Trollmaster Posts: 16657 From: Music City Registered: Jun 99 posted 06-08-2008 04:30 PM                     The problem switch in question is a sail switch. The switch in the link can replace the sail switch... and many other types relative to air.  |  IP: Logged Brad Miller Administrator Posts: 17775 From: Plano, TX (36.2 miles NW of Rockwall) Registered: May 99 posted 06-08-2008 04:52 PM                     That seems a bit overkill for the task.  |  IP: Logged Frank Angel Film God Posts: 5305 From: Brooklyn NY USA Registered: Dec 1999 posted 06-08-2008 05:09 PM                        Just get some silicon cement, squeeze out a quarter size dobble of it an smear it across where the switch arm is holding the sail. The sail won't go anywhere. Problem solved. Plus, not only will it hold the sail in place forever, but the silicon will dampen the vibration that the sail invariably encounters from the air flow, expecially on the vents that we've souped up with aux blowers.  |  IP: Logged

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