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[Craigab]

Hi,
I live in a neighborhood filled with old people that love to complain about noise.  I need a saw blade for my 8" covington slab/trim saw.  I also have a 4" saw as well.  I need to order a saw blade ASAP.  Looking at MK Diamond 303 8" in either .032" or .060" (the .025 I assume is too thin).  Is .032 too narrow for 8"?  Anyone have experience with these particular ones and if so is the noise less on narrow blades?

[Slabbercabber]

Thinner blades will resonate more and cause more noise.  Some saws resonate more than others.  Cast aluminum is quieter than sheet metal.  Lining the saw with lead sheet will reduce noise, especially on the bottom side of the table.

[vitzitziltecpatl]

Hiya' Slabbercabber.

Man, you sure do know a lot of good tricks. I've never heard anyone else talk about anything like that lead sheet tip. Thanks for stickin' around on here and passing things like that along.

Craigab - the .032" might also flex a bit on an 8" if you do any hand-feeding. It would surely be OK using a vise, but the thinner blades deflect more easily when starting a cut. I have the .040" 303 on a 10" saw, and have to make sure it starts nice and straight.

[Slabbercabber]

Hiya' Slabbercabber.

Man, you sure do know a lot of good tricks. I've never heard anyone else talk about anything like that lead sheet tip. Thanks for stickin' around on here and passing things like that along.

I spent my working life as a manufacturing and machine design engineer.  Noise reduction is always important in manufacturing.

[55fossil]

   I like the lining idea but would consider rubber mat with adhesive backing. You can cut it to fit easily and put it on the outside of the saw tank.
   While lead may be superior in some ways I am not sure about the health implications. Spent a lot of time in the military tearing lead out of walls in listening posts due to health hazards. Then it was the lead in tile floors that had to go. Now everyone thinks about water pipes...  just a thought

[Craigab]

Thinner blades will resonate more and cause more noise.  Some saws resonate more than others.  Cast aluminum is quieter than sheet metal.  Lining the saw with lead sheet will reduce noise, especially on the bottom side of the table.

Thanks for this informative reply.  This is for an 8" Covington slab/trim.  I just got the highest grade in my physics class last semester but I'm afraid I don't know enough about resonance in real life.  Do you think the thinner blade will still resonate more for a cast aluminum saw or only the sheet metal saws?  This saw does not have a cover but I will be trying to make a plexiglass top and putting towels on top to quite it down while running.

[Slabbercabber]

Frequency is mostly determined by size and shape but amplitude is determined by flexibility and damping ability.  Damping is fixed by the material but flexibility increases with decreasing thickness.  Therefore a thinner blade will always be louder.  I used to throw towels over my 10" saw when it was in the basement.  It does help.

[Felicia]

If it isn't lead, it's asbestos. They built a new school in my area and tore the old one down because of asbestos in the mastic under the floor tiles, possibly other places.

[Craigab]

Yeah I just removed some floor vinyl style tiles, I didn't realize until I was finished that it was asbestos in mastic. That black stuff is absolute hell to remove from anything as it is so sticky. 

[irockhound]

Also if it is in the garage simple things like hanging fabric vertically will cut down on noise travel.  I probably have cut down the noise of my 18" and 12" saws by trying to control the oil mist.  On the ceiling of my garage above the saws I ran small rods and then hung a plastic shower curtain in a 6 foot u shape around saws in contains most all of the oil mists and then I cut a hole in the garage wall and installed a bathroom vent fan to blow out the fumes, the outside of the vent is louvers that close when not in use to keep pests out of the garage.  When I need to access the saws I just pull open the shower curtain and close it when in use.  Fan cost maybe $25, curtain was about $8 -10 and rods were a couple bucks.

[kent]

When I was younger I played drums in a rock band. The drum kit shared the space in what was my father's rock shop (we both referred to it as the "Rock shop".
I saved egg cartons and glued them to larger panels of cardboard  and would surround the drum kit with  the baffled panels to muffle the sound so the neighbors would not get too upset by the noise.  Worked well.
I now have the "Rock Shop" sign I made for my father in wood shop class hanging outside my rock shop..... 

[Craigab]

Also if it is in the garage simple things like hanging fabric vertically will cut down on noise travel.  I probably have cut down the noise of my 18" and 12" saws by trying to control the oil mist.  On the ceiling of my garage above the saws I ran small rods and then hung a plastic shower curtain in a 6 foot u shape around saws in contains most all of the oil mists and then I cut a hole in the garage wall and installed a bathroom vent fan to blow out the fumes, the outside of the vent is louvers that close when not in use to keep pests out of the garage.  When I need to access the saws I just pull open the shower curtain and close it when in use.  Fan cost maybe $25, curtain was about $8 -10 and rods were a couple bucks.

This is an excellent idea for the oil mist!!!! I'm going to do that.  I was already going to install the ceiling fan but the shower curtain will do wonders.  The best thing I did was put rubber seal on the outer lip, and the cover the hole thing 18" saw with several towels but you still get tons of mist no matter how long you wait to open it after a cut.

[Slabbercabber]

Some mist is inevitable but if you are getting a lot, you might check blade alignment.  Any rubbing will heat the oil and cause far more mist than just cutting.

[Downwindtracker2]

For the saw area at the club , we put up rods, 1/2" EMT, and mounted a fan. We haven't hung the shower curtains ,yet.Since we are in the basement of a rural community hall, we didn't want the smell rising. We vapor barriered the ceiling too.  We haven't had a chance to test out  preventions  because of the current lock down.

[Slabbercabber]

My buffer is set up inside a box with a fan and furnace type filter behind the wheel.  I wonder if that idea might be adapted to the mist problem.