Turning Archive 2008

Subject:
Re: dust collection at bansaw.

wilbur
>Putting together how clean the bottom well of your bandsaw is with the amount of dust on your table, it's clear that you have enough suction to clean out the bottom well. Therefore, the dust left on the table isn't being pulled down below the table to be collected.

In order to collect this dust, you either need to increase the suction that your dust collector provides, or have some dust collection above the table. Barry's comment about how sealing the bottom of the bandsaw too tightly can actually lead to less efficient dust collection certainly is true. For effective dust collection, you need to move large volumes of air, which is not the same as high velocity. If you use a hood at the lathe for sanding operations, you already know this is true. That is a completely unsealed system that collects dust very well.

What may be happening is that as you seal up the bottom well, you are reducing the supply of air. If the bottom of your bandsaw is completely sealed, the only place that air would be able to enter would be around the bandsaw blade, where you may feel a rush of air, but that would be an inadequate volume of air for good dust collection. Think of the difference between a garden hose with a high power stream that shoots across the yard, and the Mississippi River on a slow day. The hose certainly shoots water faster than the Mississippi, but the Mississippi carries more water. You want the Mississippi River in your dust collection.

Try unsealing the bottom of your bandsaw one piece at a time to see if your dust collection improves. Providing some sort of above the table dust collection may be the easier route to take. You also may want to rethink that 90 turn the air has to make to go into the hose. That definitely is going to reduce the efficiency of your dust collection.

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