[SML] Chain Motor Help...

[Patrick McCreary]

Sounds like you need to think about the weight of the platform (meaning 
maybe building something lighter?).

Patrick

On 3/4/2016 4:42 PM, Will Leonard via Stagecraft 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
>
>
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