[TheForge] Acoustical baffling

[Steve Smith]

I've got a two stage compressor head that would normally be run by a 5HP 
motor. Since I had a 3HP motor and didn't have a 5HP, I just slowed it 
down proportionately (which seems to be right from the amps the motor 
draws).

1. Two stage makes it quieter than one stage.
2. Slowing it down makes it a fair bit quieter also.
3. I enclosed it on two sides only (plus roof), sending the sound down 
toward the goat pasture. Baaah.

I have to listen really hard to hear it in my shop (it is outside and 
about 10' down the building). I'm really not sure if I hear it or not 
until I'm right next to it. No insulation, just 5/8 exterior plywood 
weakly framed by 2x4's.

Mostly I'm reinforcing what others have said, with one addition: do you 
really need that much air? If not, try a bigger pulley on the motor and 
it will be quieter. Try slowing it to 2/3 speed and see if you have 
enough air. It will be lots quieter.

Steve Smith

PlumDon at aol.com wrote:
> My 7.5 hp T-30 compressor is located outside my shop and under a roof but  
> not enclosed. But it is close (100') to a neighbor. It comes on frequently when  
> I am using the Old Blue hammer or sand blasting cabinet. I'm afraid it is  
> beginning to irritate them and I would like to head off any problems. 
>  
> I put up a 4' x 8' wall with T-111 and home insulation. Helps but still a  
> lot of noise going to the neighbors. I was thinking some kind of convenient  
> roll-up sound insulating blanket might be available that I could just drop down,  
> like a shade or curtain when in use. Any one have any experience or 
> suggestions?  They would be greatly appreciated. 
>  
>  
> Don  Plummer
> Plummer Design Works
> 392 Hallman Mill Road
> Phoenixville, PA  19460
> 610-495-5058
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