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X-Real-To: stagecraftlist [at] theatrical.net Received: by prxy.net (CommuniGate Pro PIPE 4.2.10) with PIPE id 30922721; Wed, 07 Jun 2006 03:01:20 -0700 X-Spam-Checker-Version: SpamAssassin 3.1.1 (2006-03-10) on localhost X-Spam-Level: X-Spam-Status: No, score=-3.5 required=5.0 tests=AWL,BAYES_00,NO_RECEIVED, NO_RELAYS autolearn=unavailable version=3.1.1 X-ListServer: CommuniGate Pro LIST 4.2.10 List-Unsubscribe: List-ID: Message-ID: From: "Stagecraft" Sender: "Stagecraft" To: "Stagecraft" Precedence: list Subject: Stagecraft Digest #836 Date: Wed, 07 Jun 2006 03:00:31 -0700 MIME-Version: 1.0 Content-Type: text/plain; charset="ISO-8859-1" Content-Disposition: inline X-TFF-CGPSA-Version: 1.4 X-prxy-Spam-Filter: Scanned For info, archives & UNSUBSCRIBE, see --------------------------------------------------- Stagecraft Digest, Issue #836 1. Re: Different Rigging question by Bill Sapsis 2. Re: Curtain Liner by Bill Sapsis 3. Re: Different Rigging question by "Peter Scheu" 4. Re: Different Rigging question by "Phil Blackwood" 5. Re: Different Rigging question by "Phil Blackwood" 6. Re: Different Rigging question by "Delbert Hall" 7. Another rigging question, Was and still is Re: Different Rigging question by "Idaho Scenic & Rigging" 8. Re: Different Rigging question by "Phil Blackwood" 9. Re: Simulated bullet hits by Loren Schreiber 10. Re: Semper fi by Dale Farmer 11. Re: Different Rigging question by Dale Farmer 12. Re: Shop Floor by Dale Farmer 13. Cleaning procedures for S4 by "Riter, Andrew $Head Ltg$" 14. Re: Different Rigging question by "Brian Munroe" 15. Re: ABTT Engineering Conf. by "Bill Conner" 16. Re: Acoustics by "Bill Conner" 17. Re: Semper Fi by Michael Sorensen 18. Forever Plaid Costumes by Jonbielich [at] aol.com 19. VectorWorks training.. by Jonbielich [at] aol.com 20. Re: Different Rigging question by "Delbert Hall" 21. Re: Simulated bullet hits by Jerry Durand 22. Re: Simulated bullet hits by Mark O'Brien 23. Re: Simulated bullet hits by Jerry Durand 24. Re: audio from a generator by NODEraser *** Please update the subject line of your reply to use the subject *** line of the message you are replying to! Please only reply to *** one message subject in each reply. ---------------------------------------------------------------------- Date: Tue, 06 Jun 2006 19:33:32 -0400 Subject: Re: Different Rigging question From: Bill Sapsis Message-ID: In-Reply-To: Hey, new proud papa Peter. I think I have to disagree with you here. The D:d ratio really shouldn't affect the friction coefficient all that much. Yhe D:d ratio will have an adverse affect on the 1/8" wire rope but really should affect the friction coefficient all that much. It's the type of bushing/bearing that affects the friction coefficient. Bill S. ETCP Certified Rigger - Theatre www.sapsis-rigging.com 800.727.7471 267.278.4561 mobile Join the Long Reach Long Riders on their 3rd annual cross country charity motorcycle ride. On 6/6/06 3:00 PM, "Peter Scheu" wrote: > As was mentioned before, the D:d ratio (assuming you are using 7x19 aircraft > cable - other wire rope construction's D:d will vary) should be 30:1. So for > 1/8" cable, you really should be using +/- 4" diameter sheaves. Getting > these with ball or roller bearings instead of the bronze bushings would ease > things as well . > > Crosby has some different types available (steel, cast iron, Nylon), as does > McMaster, though they will be a bit pricey (not that the safety of your > system should be dependant upon cost). You could also check with Sapsis, > Clancy, H&H or SECOA. They may have other sources as they deal with these > kind of sheaves all the time. ------------------------------ Date: Tue, 06 Jun 2006 19:41:38 -0400 Subject: Re: Curtain Liner From: Bill Sapsis Message-ID: In-Reply-To: David. If you use the 21 oz Marvel you might want to line it. If you use the 25 oz you shouldn't have to. My $.02. YMMV Bill S. ETCP Certified Rigger - Theatre www.sapsis-rigging.com 800.727.7471 267.278.4561 mobile Join the Long Reach Long Riders on their 3rd annual cross country charity motorcycle ride. On 6/6/06 7:11 PM, "David Neale" wrote: > For info, archives & UNSUBSCRIBE, see > --------------------------------------------------- > > Howdy. I'm a long-time Stagecraft mailing list "voyeur", first-time > contributor. The school I work at is two months away from completion of a > brand new 550 seat proscenium arch auditorium. We're down to picking out > curtains which unfortunately coincides with being down to the end of our > budget. I have convinced our business director that a decent and durable > grand drape is necessary but he is questioning me about the importance of a > curtain liner. Although I have never seen a grand without a liner, I was > unable to tell him why it is necessary other than for cutting down light > penetration. He countered that if the grand material is thick enough, a > liner would be redundant. This is where I turn to you. How do I answer > the business director's questions: Is a curtain liner > necessary? Why? FYI For material, we are currently considering Rose > Brand's 21oz. Marvel or 25oz. Memorable. Thanks in advance for any advice > you might have. > > > David Neale > Director of Drama & Video > American School in Japan > ------------------------------ Reply-To: From: "Peter Scheu" Cc: Bill [at] sapsis-rigging.com (Bill Sapsis) Subject: RE: Different Rigging question Date: Tue, 6 Jun 2006 19:48:19 -0400 Organization: Scheu Consulting Services, Inc. Message-ID: In-reply-to: unca bill wrote: >Hey, new proud papa Peter. I think I have to disagree with >you here. The D:d ratio really shouldn't affect the friction >coefficient all that much. Probably right. It will help somewhat, but probably not enough to make a noticeable difference. As I type this with one hand, with Evan in the other arm, I think "I gotta get a life". But then I realize... I got one as a gift. A really good one. Peter Scheu Scheu Consulting Services, Inc. Syracuse, NY www.scheuconsulting.com ------------------------------ Message-ID: <9cbafac70606061652k69b991e0rcb49ef6f953762ed [at] mail.gmail.com> Date: Tue, 6 Jun 2006 16:52:17 -0700 From: "Phil Blackwood" Subject: Re: Different Rigging question In-Reply-To: References:

On 6/6/06, Brian Munroe wrote: > Actually, as I re-read your original post, I am a bit confused. Where > are the lift lines from the piece going and where are your custom > sheaves mounted? What is the purpose of the floor mounted sheave? If > I read your post correctly, the sheaves are mounted on system pipe and > the lift line terminates at the grid? Huh? I am more confused now. To clarify: Each panel is lifted by 2 lift lines, 1/8" wire rope. It travels up to the grid, through loft blocks, then down to the floor blocks, then upstage to a batten.The custom loft blocks and floor blocks change the direction of rope travel upstage so that they can be lifted by raising battens upstage. The blocks are oriented at 90 degrees to the loft blocks for the rigging system. The loft blocks are directly over the panels so the panels always lift directly up and down. The panels only rub against the 3x3 posts with MDF fronts and backs. -- Phillip Blackwood Technical Director School of Theater Arts University of Arizona (520)621-1104 ------------------------------ Message-ID: <9cbafac70606061654q7e62e3f1ofdec547fd6fa3390 [at] mail.gmail.com> Date: Tue, 6 Jun 2006 16:54:22 -0700 From: "Phil Blackwood" Cc: peter [at] scheuconsulting.com Subject: Re: Different Rigging question In-Reply-To: References:

I'm just wondering how you fing the time to do all this posting with a one week old! Congratulations! -- Phillip Blackwood Technical Director School of Theater Arts University of Arizona (520)621-1104 ------------------------------ Message-ID: Date: Tue, 6 Jun 2006 20:15:51 -0400 From: "Delbert Hall" Cc: peter [at] scheuconsulting.com Subject: Re: Different Rigging question In-Reply-To: References:

Phil, Sounds like a very clever rigging solution. Although the small D:d ratio will shorten the lifespan of your cable, it will not make the load more difficult to lift. I definately think you need sheaves with better bearings. Look at the sheaves made by Ralmark. I also think you need to check the rope locks to see that they are not too tight also remove any old pieces of spike tape that may be getting caught in the rope locks). If that is not the problem, then look to see that the arbors are binding in the T-bar tracks. Also check your fleet angles of the cables that you ran. Is each panel being lifted by two cable? Is there really a custom made "headblock" (with multiple cables) or just a series of loft blocks and floor blocks (oriented in an US/DS manner) used to divert the cables so that the cables finally end up running vertically up to the correct battens? -Delbert -- Delbert L. Hall ZFX Flying Director Phone: 714-585-7070 ------------------------------ Message-ID: <00cd01c689ca$8f74e680$6401a8c0 [at] amd2200> From: "Idaho Scenic & Rigging" References: Subject: Another rigging question, Was and still is Re: Different Rigging question Date: Tue, 6 Jun 2006 18:37:21 -0600 I agree with Bill bending a steel cable will cause you only a bit of friction. as will straightening it out again, (leaving the sheave). It's more of a compression/ tension thing within the cable itself. Bigger the cable more movement A 1/8" steel will last longer on a 10" sheave than a 5" one. A 10" sheave will turn half as much as a 5" one. You have to make more room for the 10" one and its weight. Bill (or any one else) I have a question for you? Stop me any time I am off. Exaggerated scenario!!! I have learned that every time you change direction on a sheave it adds 10% to the load. a hundred pound load over 1 sheave requires 110 pounds of force to move it. (give or take) OK? Say you have a 100# load, over ten sheaves, . does it require: A. simple answer, 200 pounds of force to move it? B compound answer (about) 257 pounds of force to move it. All other things being equal. Not a block and fall. (although theoretically the same amount of energy would be required) Methinks answer B. but me, I would rather err on the safe side. Just passing my time thinking between shows. Rob't ----- Original Message ----- From: "Bill Sapsis" >I think I have to disagree with you here. The > D:d ratio really shouldn't affect the friction coefficient all that much. > Yhe D:d ratio will have an adverse affect on the 1/8" wire rope but really > should affect the friction coefficient all that much. It's the type of > bushing/bearing that affects the friction coefficient. > > Bill S. > > > As was mentioned before, the D:d ratio (assuming you are using 7x19 aircraft > > cable - other wire rope construction's D:d will vary) should be 30:1. So for > > 1/8" cable, you really should be using +/- 4" diameter sheaves. Getting > > these with ball or roller bearings instead of the bronze bushings would ease > > things as well . ------------------------------ Message-ID: <9cbafac70606061743n69abab65m264e4d8fae84142c [at] mail.gmail.com> Date: Tue, 6 Jun 2006 17:43:51 -0700 From: "Phil Blackwood" Subject: Re: Different Rigging question In-Reply-To: References:

> Is each panel being lifted by two cables? Yes >Is there really a custom > made "headblock" (with multiple cables) no > or just a series of loft > blocks and floor blocks (oriented in an US/DS manner) used to divert > the cables so that the cables finally end up running vertically up to > the correct battens? Yes -- Phillip Blackwood Technical Director School of Theater Arts University of Arizona (520)621-1104 ------------------------------ Message-Id: <6.1.1.1.2.20060606173952.03eeb8a0 [at] mail.sdsu.edu> Date: Tue, 06 Jun 2006 17:59:26 -0700 From: Loren Schreiber Subject: Re: Simulated bullet hits In-Reply-To: References: Typical SMC valves are rated to 250psi as are most air cylinders. The hoses and fittings to 400psi. I've never had to run a pneumatic system above 150psi. Hmmm . . . using a sprinkler valve for an air cannon? I'd be interested to hear how it works. I use ASCO Red Hat 3/4" air valves on my air cannons. They are available to run on 120AC, so no need for 24V power supply. McMaster Carr and Grainger carry them. Of course, they are WAY more expensive than sprinkler valves, but they are industrial quality. A PLC would be my choice for computerizing the devices. You can get a suitable one from Automationdirect.com for around $100. If you don't know how to program one, I can send you a diagram for your project. Its easy. At 04:42 PM 6/6/2006, you wrote: >I'm trying to build a computer controlled system of air valves to = >simulate bullet hits. I've seen some valve manifolds made by smc, but I = >don't know if they have a high enough presure rating to be very usefull. = >I'm guessing 30-40 psi would be suffiecient pressure. I'm also trying to = >build an air cannon using a sprinkler valve and a 5 gallon air tank. Any = >help would be greatly appreicated.=20 > >Jerome Wild >Posted by dad >Wildl [at] northern.edu Loren "Grits" Schreiber, Technical Director School of Theatre, Television and Film San Diego State University Long Reach Long Riders announce dates for the 2006 Charity Ride. Check out www.lrlr.org for more information, and then join us! ------------------------------ Message-ID: <448626D7.70909 [at] cybercom.net> Date: Tue, 06 Jun 2006 21:07:35 -0400 From: Dale Farmer Organization: I'm working on that.... Subject: Re: Semper fi References: In-Reply-To: Michael Powers wrote: > For info, archives & UNSUBSCRIBE, see > --------------------------------------------------- > > Jerry Durand Writes: > >> BTW, Aren't Marines just sailors without a ship? :) > > Boy! It's a good thing you've got a smiley there. Otherwise I'd have > to do evil things to your body, beat you severely about the head and > shoulders, kill you two or three times and THEN I'd have to hurt you! > ;-) Naw. The marines go play in the mud and live out of a backpack and rude folks shoot at them. Sailors go to sea with four hot meals per day, showers, bunks, air conditioning and lots of high explosives. --Dale former navy hospital corpsman. ------------------------------ Message-ID: <448629D9.3020203 [at] cybercom.net> Date: Tue, 06 Jun 2006 21:20:25 -0400 From: Dale Farmer Organization: I'm working on that.... Subject: Re: Different Rigging question References:

In-Reply-To: Phil Blackwood wrote: > For info, archives & UNSUBSCRIBE, see > --------------------------------------------------- > >> Is each panel being lifted by two cables? > > Yes > >> Is there really a custom >> made "headblock" (with multiple cables) > > no > >> or just a series of loft >> blocks and floor blocks (oriented in an US/DS manner) used to divert >> the cables so that the cables finally end up running vertically up to >> the correct battens? > > Yes > I may be visualizing this differently than the reality. If the three pieces are held on the same plane by those I joints, and each piece is flown from a different batten on different us/ds planes, then you have some side force on your blocks. That would increase resistance, as now the sheaves are being pulled sideways a bit. This may also be causing other small issues with the blocks to become more noticeable. --Dale ------------------------------ Message-ID: <44862AC9.80007 [at] cybercom.net> Date: Tue, 06 Jun 2006 21:24:25 -0400 From: Dale Farmer Organization: I'm working on that.... Subject: Re: Shop Floor References: In-Reply-To: Jeffrey E. Salzberg wrote: > For info, archives & UNSUBSCRIBE, see > --------------------------------------------------- > > > >> It's >> kinda weird but a lot of people have told me they "knew" it >> was gonna happen just before it did. Can anybody else bear this out? > > We often process information at a subconscious level; in other words, we see > (and recognize) a danger before processing the data intellectually. > > > > Well, I've known an accident was coming before it happened. I heard someone say "Hey guys, watch this!" --Dale ------------------------------ Subject: Cleaning procedures for S4 Date: Tue, 6 Jun 2006 18:19:06 -0700 Message-ID: <0E0CDE94AC5F92428C823684D00244E6092999B3 [at] exchange10.mercury.ad.ubc.ca> From: "Riter, Andrew $Head Ltg$" Hi everyone I've prepped a document about cleaning source 4s. I'd like it to be = vetted by a couple of other people, if some kind souls would raise their = hands . . . Let me know if I've got anything wrong, missing anything, could do = something better (like a better method for cleaning the polymer 10 deg = lenses). If you'd be willing to look at it, and offer comments, please email off = list. I'll happily share the corrected version with those that help = (and all other listers, as well). I know Abby was quite surprised with the = response she got with her document. Unfortunately for me, it dealt = mostly with painting and external touch-ups, rather than the nuts and bolts = cleaning and maintenance. Thanks Andrew M. Riter Head Lighting Technician Chan Centre for the Performing Arts University of British Columbia 6265 Crescent Road Vancouver, BC, V6T 1Z1 604-822-2372 604-822-1606 fax chanlights [at] exchange.ubc.ca ************* You understand, we are tied down to a language which makes up in = obscurity what it lacks in style =A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0= =A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0=A0 Stoppard, R&G are Dead ********************* ------------------------------ Message-ID: Date: Tue, 6 Jun 2006 21:19:49 -0400 From: "Brian Munroe" Subject: Re: Different Rigging question In-Reply-To: References:

On 6/6/06, Bill Sapsis wrote: > Hey, new proud papa Peter. I think I have to disagree with you here. The > D:d ratio really shouldn't affect the friction coefficient all that much. > Yhe D:d ratio will have an adverse affect on the 1/8" wire rope but really > should affect the friction coefficient all that much. It's the type of > bushing/bearing that affects the friction coefficient. And Delbert added: > Although the small D:d > ratio will shorten the lifespan of your cable, it will not make the > load more difficult to lift. Bill and Delbert are correct about the friction not being effected by the sheeve size. But wouldn't a bigger sheeve size be easier to turn than a smaller size? Like a bigger caster is easier to push than a smaller one or a larger steering wheel is easier to turn than a low-rider steering wheel. I don't have any material to support this theory however. Brian Munroe bpmunroe [at] gmail.com ------------------------------ Message-ID: <052601c689d1$6fa348e0$6501a8c0 [at] BCA1> Reply-To: "Bill Conner" From: "Bill Conner" Subject: RE: ABTT Engineering Conf. Date: Tue, 6 Jun 2006 20:26:43 -0500 Sorry - I think Monday evening is the one theatre tour I signed up for plus plan to see a show. I would like to meet up though. Bill C. ASTC, ETCP CR-T ------------------------------ Message-ID: <052a01c689d1$f4a63020$6501a8c0 [at] BCA1> Reply-To: "Bill Conner" From: "Bill Conner" Subject: RE: Acoustics Date: Tue, 6 Jun 2006 20:30:26 -0500 What sort of treatment? Do you want absorption or diffusion? If you're looking for absorption, there is nothing less expensive than heavy velour curtains. Bill C. ASTC ETCP CR-T ------------------------------ Message-ID: <20060607015516.94262.qmail [at] web50715.mail.yahoo.com> Date: Tue, 6 Jun 2006 18:55:16 -0700 (PDT) From: Michael Sorensen Subject: Re: Semper Fi In-Reply-To: < But he asked me to pass along two quick corrections of his own: <> Per Dale, there is no such thing as an "ex-Marine"....apparently "former Marines", "retired Marines", and "dead Marines" are all Corps approved descriptions.>> My old friend Mark Darfus who was a Marine sniper once told me, "There are no ex-MARINES, only ones who are on non-active duty." BTW, the best shot I've ever seen. Less than 1/2 minute of angle in a 10 shot group at 500 yards shot in under 2 minutes...bought him a case of scotch for that bet (which I helped him drink). Michael Sorensen Proton Lighting and Video "We positively charge up your show!" Phone: 520-232-3540 Email: chaoscon666 [at] yahoo.com "It's all just a scam, isn't it? You get those actors to put on a show, just so you can have a good reason to play with your toys." --Christopher Stasheff, "A Slight Detour" __________________________________________________ Do You Yahoo!? Tired of spam? Yahoo! Mail has the best spam protection around http://mail.yahoo.com ------------------------------ From: Jonbielich [at] aol.com Message-ID: <378.4821e2b.31b79507 [at] aol.com> Date: Tue, 6 Jun 2006 22:33:43 EDT Subject: Forever Plaid Costumes You can contact Lyric Theatre of OKC I believe they rent cheap...use my name or contact University of Central Oklahoma. I believe Dottie is still the costume lady there ....Just google the two Im fairly sure they both have all of the costumes. ------------------------------ From: Jonbielich [at] aol.com Message-ID: <2dc.7cacb18.31b7981d [at] aol.com> Date: Tue, 6 Jun 2006 22:46:53 EDT Subject: VectorWorks training.. For the cost of Air Fare...what if we kick in room and board?? Jon Bielich Putnam City PAC OKC, OK (405)414-3271 ------------------------------ Message-ID: Date: Tue, 6 Jun 2006 23:06:09 -0400 From: "Delbert Hall" Subject: Re: Different Rigging question In-Reply-To: References: Phil, You described the setup exactly the way I pictured it. Cleaver design. It should work fine. I hope you have a secured those floor blocks securely because there is 300 pounds of upward force on each of them (plus any shockload). -Delbert -- Delbert L. Hall ZFX Flying Director Phone: 714-585-7070 ------------------------------ Date: Tue, 06 Jun 2006 21:01:36 -0700 From: Jerry Durand Subject: Re: Simulated bullet hits In-reply-to: Message-id: <1402AED5-D200-4F37-AD10-08C4BEFAEE35 [at] interstellar.com> References: On Jun 6, 2006, at 5:59 PM, Loren Schreiber wrote: > Hmmm . . . using a sprinkler valve for an air cannon? I'd be > interested to hear how it works. I've used 1" sprinkler valves and they worked just fine. The barrel of the cannon was a 1" PVC pipe 5 feet long, stuffed with the big flame-proof confetti. We had several barrels pre-loaded and just screwed them into the valve to re-arm. ------------------------------ Message-ID: <20060606211434.xt000w4gw8skkgso [at] www.email.arizona.edu> Date: Tue, 6 Jun 2006 21:14:34 -0700 From: Mark O'Brien Subject: Re: Simulated bullet hits References: In-Reply-To: > At 04:42 PM 6/6/2006, you wrote: >> I'm trying to build a computer controlled system of air valves to = >> simulate bullet hits. I've seen some valve manifolds made by smc, but I = >> don't know if they have a high enough presure rating to be very usefull. = >> I'm guessing 30-40 psi would be suffiecient pressure. I'm also trying to = >> build an air cannon using a sprinkler valve and a 5 gallon air tank. Any = >> help would be greatly appreicated.=20 >> >> Jerome Wild >> Posted by dad >> Wildl [at] northern.edu From my friend Jon in Chicago... Email me off list for his contact info... Mark, SMC valves and manifolds are typically rated at 100psi or better, up to 145 psi. We have manifolds designed to run on any of the common industrial protocols (DeviceNet, Allen-Bradley Remote I/O, Asi, Profibus, etc), either by PC or PLC. If the guy with the question can let me know which protocol he plans to use, how many valves, and his flow requirements, I can recommend a model. Or if he already has output cards already in the PC, we can supply a manifold with a D-Sub Connector or Flat Ribbon Cable, and he can direct wire it. I'd need to know the current capacity of his outputs in order to select a valve, but we have several choices. Many of our valve models require 0.5 watts, but we have some that need only 0.35 watts, and some that require as little as 0.1 watts. Or he can use relays.... For an air cannon he might try our part number VXD2260-10N-3D. That model comes with a 1" port, and is operated by 110VAC. We've also got that in 24 VDC - part number VXD2260-10N-5DZ. Other options would be something like VNA401A-N25A, which is an air operated valve with a 1" port, or maybe even VNA711A-N50A-3DL which is a 110VAC, 2" port valve. All of these are in stock, and further info can be found at www.smcetech.com. I don't know quite what flow is required to operate an air cannon, but I would suspect that a 2" valve would be plenty! Let me know if I can help. Jon Jensen, CFPPS National Training Manager SMC Corporation of America Mark O'Brien Opera Technical Director University of Arizona, School of Music 520-621-7025 520-591-1803 Mobile ------------------------------ Date: Tue, 06 Jun 2006 21:41:52 -0700 From: Jerry Durand Subject: Re: Simulated bullet hits In-reply-to: Message-id: <51D3A490-323B-477D-9015-421007536E94 [at] interstellar.com> References: On Jun 6, 2006, at 9:01 PM, Jerry Durand wrote: > I've used 1" sprinkler valves and they worked just fine. The > barrel of the cannon was a 1" PVC pipe 5 feet long, stuffed with > the big flame-proof confetti. We had several barrels pre-loaded > and just screwed them into the valve to re-arm. One thing with the valves, since we didn't have a high-flow compressor, we found that we had to screw down the handle used to set the sprinkler flow. If we didn't do this, the valve might leak enough to keep the tank from pressurizing. Once there was some pressure in the tank, the valve would stay sealed just fine. ------------------------------ Message-ID: Date: Tue, 6 Jun 2006 22:16:05 -0800 From: NODEraser Reply-To: greg [at] hypersoft.zzn.com Subject: Re: audio from a generator In-Reply-To: References: On 6/6/06, Clive Mitchell wrote: > For info, archives & UNSUBSCRIBE, see > --------------------------------------------------- > > In message , Jerry Durand > writes > >>If the gennies got it's output referenced to it's chassis then it must > >>be bonded to the truck chassis and localised ground area with a spike > >>plate. > > > >What do you do in the case of a float that's moving, can't hardly drive > >a spike in the road. > > Unless it's trailing cables to external loads it's fine. The ground > spike is required on generators feeding external loads like lighting > sets or site power. > > Then again, in the film industry it depends on the local union. They > all have different ideas, some of which are based on opinions and not > electrical principles. > > -- > Clive Mitchell > http://www.bigclive.com > ------------------------------ End of Stagecraft Digest #836 *****************************