|Forum topic by RichardDePetris||posted 06-10-2015 06:06 AM||2641 views||0 times favorited||41 replies|
06-10-2015 06:06 AM
I’m considering building my own dust collector. I found several parts that I scavenged and one of them is a HVAC furnace blower from a neighbor who replaced their HVAC system. As I understand it, the RPMs are too low to create enough static pressure, so I will have to replace the motor with a higher speed AC motor. I have quite a collection of 1/2 HP to 1 HP motors I can use. The squirrel cage will have to go, leaving me with only the housing which may work for housing the impeller and motor.
I’ve been reading all kinds of resources online and was very excited about this project until I stumbled upon Bill Pentz’s site. He is supposedly an expert on dust collectors and has extensive information on how to build one. Unfortunately, he really scares the crap out of me for not having a proper one and then scares the crap out of me if I don’t build it according to his specifications, which costs as much or more than an decent dust collector.
His specifications states emphatically that you only use a steel impeller by his recommended manufacturer (http://billpentz.com/woodworking/cyclone/blower.cfm). Plastic can’t stand up to the rigors of dust collection and will eventually fall apart, especially when hit by debris. An aluminum is far worse—as good as using a plutonium one. If a hard object hits the impeller, it can explode into shrapnel and kill everyone and destroy everything in sight. Worse yet, if a ferrous metal hits it, it can spark and start a thermite chain reaction, turning your dust collector into a hot molten core of metal burning its way through the concrete foundation where it will hit the ground water and exploding into a giant mushroom cloud, scorching the neighborhood with days of darkness, fallout and centuries of toxic ground water.
Obviously, I am exaggerating here, but is Pentz exaggerating also? Is there any validity to these spectacular claims? Can you get a thermite reaction in a dust collector? Can a nail cause the impeller to break apart into pieces of high velocity metal? They are a bit over the top, considering that I’ve never heard of anything like this happening before. Moreover, it makes me wonder what horse Mr Pentz has in the game considering he designed a commercial dust collection system with his name on it.