As stated By the Other Dennis and others, The best solution is to use the dust collector for what it was made for which is dust. Table/bandsaws make dust only which makes them a perfect candidate for a dust collector. However a lathe makes both dust and shavings. Its great for collecting dust while sanding on the lathe, but creates more problems when considering it as a shopvac. Dont ask how i know this. Floor sweeps connected to the dust collector? Been there, done that. I Dont do that anymore.
A 4" PVC connected to a 4" hose, that worked for a while, but filled up the drum fast and clogged the internal filter.
Today, after trial and error, I use my dust collector in two ways.
1. Sanding on the lathe (not for turning)
2. As an air cleaner for the shop.(Intake hose is faced towards the middle of the shop).
For cleanup of shavings , I wear a mask and blow all the shavings off the lathe, counter, floor etc... to the corner of the room and shovel them into a hugh plastic bag while the DC is on collecting all the dust that I put back in the air. I leave the room with the DC on for about 15 minutes and reblow the dust that settled on countertoops and tools. Cleanup is much faster than Vaccuming. The next day, I may reblow the resettled dust, if needed. I only use the shopvac for the unsholved shavings..
Thought Id share what works for my situation.