<div dir="ltr"><div>I thought static loads required a safety factor of 7:1 and dynamic loads required a safety factor of 10:1 (I took Mr. Glerum's class years ago).<br><br></div>And I'm working a home town parade tomorrow, after which there will be BBQ (but no beer).<br></div><div id="DDB4FAA8-2DD7-40BB-A1B8-4E2AA1F9FDF2"><br>
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</table><a href="#DDB4FAA8-2DD7-40BB-A1B8-4E2AA1F9FDF2" width="1" height="1"></a></div><div class="gmail_extra"><br clear="all"><div><div class="gmail_signature"><div dir="ltr"><div><div dir="ltr">-Phil<br><br>"Quini, quidi, quici" - I came, I saw, I played a little quidditch. <br><br><br></div></div></div></div></div>
<br><div class="gmail_quote">On Fri, Mar 4, 2016 at 1:42 PM, Will Leonard via Stagecraft <span dir="ltr"><<a href="mailto:stagecraft@theatrical.net" target="_blank">stagecraft@theatrical.net</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">Guys,<br>
<br>
I have a show coming up where a designer where a designer would like us to use variable speed Chain Hoists to raise a lower a platform with 2 actors riding it. We are trying to negotiate the trick, but we are getting some push back when we said we needed a minimum of a 7:1 Safety Design Factor for this move. This means that the weight of the unit is such that we would need 11 1 Ton Hoists to raise & lower the unit, when we only have access to 4. The designer emailed us a link to CM's website that states that they use a 10:1 Safety Design Factor, so that should cover the move.<br>
<br>
I have always taken the rating of a motor (or hardware) & then applied my own safety factor to the already lower number. (i.e.: I'm not going to put 5 tons on a 1 ton motor just because it has a 10:1 safety factor.) So am I wrong in this? Are we just being whiney? Our designer is going to be here in a few hours to meet, so what do y'all think? Bill... Delbert... Bill... Dave... Steve... anyone?<br>
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Hope y'all have beer & BBQ if you're into that thing this weekend!<br>
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Thanks,<br>
- Will Leonard<br>
Associate Technical Director<br>
Alley Theatre<br>
O: 713-315-5449<br>
C: 713-252-9809<br>
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