Originally Posted by
Dueane Hicks
Its a 1200 cfm 4"; I think the problem might be the type of wood I'm running through it.
The maximum amount of air flow you can physically fit in a 4" duct is only 400-500 CFM at the given air velocity produced by most DC blowers. It doesn't matter what the DC is rated (real or imagined)...it's about what can actually flow through the duct work. I agree that air flow may be contributing to the issue you illustrate in your photo...it's somewhat common on drum sanders, unfortunately, because manufacturers design the dust collection based on what many folks have available rather than what's actually needed...which is a huge amount of air flow to cover the needs of the tool.
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The most expensive tool is the one you buy "cheaply" and often...