sound transfer
sound transfer
(OP)
Hi all, my appologies if this is not the correct place for this.
Can anyone help here.
in regards bushing for a roller what would give the lowest sound transfer. Delrin or Brass with a concave profile running on 2 steel screws with a convex profile.
Loading etc is not required here sound transfer is.
thanks
c0rd0bes (mechanical)
Can anyone help here.
in regards bushing for a roller what would give the lowest sound transfer. Delrin or Brass with a concave profile running on 2 steel screws with a convex profile.
Loading etc is not required here sound transfer is.
thanks
c0rd0bes (mechanical)





RE: sound transfer
Another hint. They don't make bells out of plastic.
Regards
Pat
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RE: sound transfer
here is my drawing, my apologies I cant get to Autocad at the minute.
--> >O< <--
--> side view of a steel screw with concave end (haha)
> insert to the roller with the convex profile (delrin or brass)
O side view of the roller
Yeah i appreciate that delrin is a dupont brand name for an acetal homopolymer, I guess I was looking for assurance before I buy the parts as there seems to be a transatlantic message mixup.
its actaully for a JL Fisher Boom arm the rollers are near the front 3 off them. This hold the microphone at the end , used throughout the cinema and tv industry. (basically a glorified extendible fishing rod on a hydro pneumatic base)
RE: sound transfer
While actual sound waves may be less with acetal, electrical noise may become an issue.
Acetal will be a good choice in that environment, especially if it is protected from UV light by being encased in metal or being indoors away from high intensity lights that are high in UV.
Nylon will run a tad quieter as it's a bit softer, but the fit will vary with moisture uptake if a precision fit is required.
Various types of polyethylene are likely to be quieter still as they are a lot softer.
Regards
Pat
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RE: sound transfer
When you say electrical noise what do you mean - how would that affect me in the setup?
The microphone is mounted on a "noise free" *cough* cradle at the front and a cable runs down the side and around the rollers (that allows it to extend as you wind the arm in and out). The cable is a cloth covered microphone spec cable to help minimise mechanical friction noises, and is side mounted on some form of plastic at various points along the way.
I would say if you put brass in there there is more chance to hear the running noise from that than delrin (albeit the sound boys are by nature very particular in that department - great guys though)
RE: sound transfer
Regards
Pat
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RE: sound transfer
Thanks again
c0rd0bes
RE: sound transfer
Regards
Pat
See FAQ731-376: Eng-Tips.com Forum Policies for tips on use of eng-tips by professional engineers &
http://eng-tips.com/market.cfm
for site rules