[SML] Chain Motor Help...

[Phil Haney]

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).

And I'm working a home town parade tomorrow, after which there will be BBQ
(but no beer).

This email has been sent from a virus-free computer protected by Avast.
www.avast.com
<https://www.avast.com/sig-email?utm_medium=email&utm_source=link&utm_campaign=sig-email&utm_content=webmail>
<#DDB4FAA8-2DD7-40BB-A1B8-4E2AA1F9FDF2>

-Phil

"Quini, quidi, quici" - I came, I saw, I played a little quidditch.



On Fri, Mar 4, 2016 at 1:42 PM, Will Leonard via Stagecraft <
stagecraft at theatrical.net> wrote:

> Guys,
>
> 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.
>
> 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?
>
> Hope y'all have beer & BBQ if you're into that thing this weekend!
>
> Thanks,
> - Will Leonard
> Associate Technical Director
> Alley Theatre
> O: 713-315-5449
> C: 713-252-9809
>
>
> ____________________________________________________________
> For list information see <http://stagecraft.theprices.net/>
> Stagecraft mailing list
> Stagecraft at theatrical.net
> http://theatrical.net/mailman/listinfo/stagecraft_theatrical.net
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://theatrical.net/pipermail/stagecraft_theatrical.net/attachments/20160304/cd262e06/attachment.html>