|Forum topic by gtbuzz||posted 03-16-2013 12:56 AM||1399 views||0 times favorited||6 replies|
03-16-2013 12:56 AM
Since I’ve got most of the workings of a “real” cyclone, I’ve been looking to upgrade the motor to a 2hp-3hp unit to increase performance. It’s proving rather difficult to find anyone that sells just the motor, so I’m left with the option of just harvesting a regular single stage dust collector for the parts. What I’m finding though, is that specs for motors and performance are really confusing me!
I know HP ratings are a rather poor indicator of true performance, but I’ve been using them just to group together “classes” of dust collectors. Take for example these dust collectors:
Grizzly G1029Z2P – 2HP, 9A at 220V, 1550 CFM
The Grizzly 3hp claims to pull quite a few more CFM (numbers are in line if you assume about 750cfm/HP), but the Shop Fox in comparison, which is the same 2HP as the Grizzly and CFM, draws 12A – the same as the 3HP Grizzly. What’s with the increased amp draw? Is it just a cheaper, less efficient motor? Or is it likely to be more powerful than the Grizzly 2HP that pulls 9 amps?
I also know impeller size may play a factor too – the Shop Fox has a 12” impeller, while the 2 Grizzly’s have a 12.75” impeller. All of them claim to run at 3450rpm, but I’m going to assume that that speed is the max speed and will bog down under load. Otherwise, wouldn’t we not care about the horsepower at all and only be concerned with the impeller diameter and the speed? Either way, I’m trying to ignore this factor right now since there’s already so many variables.
Thanks for any clarifications anyone can give. Also, if anyone has any suggestions on where I could get just a motor and impeller without exceeding the cost of a new single stage dust collector, I’m all ears. Looking out on Craigslist right now too.