kd6vpe wrote:Ahh, Now it is starting sink in and brings up another question is it better to have the 4in run all the way to the equipment and have the reducer at the very end?
Yes, but also the shape of the reducer matters, you need to reduce resistance. I had some flat adapters with basically a hole and when I changed to a funnel I could notice the difference. Of course when I went to 1200 CFM and 6" pipe for the runs I noticed a much bigger difference. I still use my vacuum with the jointer because the airflow is too restricted for the duct collector to work well.
My dust collector is mostly used with the lathe and planner and I use both for my miter-saw.
Paul Cohen
Beaverton, OR
A 1982 500 Shopsmith brand upgraded to a Mark 7 PowerPro, Jointer, Bandsaw (with Kreg fence), Strip Sander, Ring Master and lots of accessories all purchased new
12" Sliding Compound Mitre Saw, 1200 CFM DC
Tim,
It was just a play thing to try. Yes my shop is not really a shop. It is crowded but it functions. My plan is to move into the single car garage next to the exiting shop and use that space for wood storage.
Everyone else thank you for the responses. Its nice to know I'm not alone. I will work on this somemore I just don't like having the chips laying in there very long attracting moisture. My current shop has a lot of moisure in it during the winter.
SS 500 upgraded to 510; SS bandsaw; SS jointer
SS Oscillating Drum Sander; Universal Lathe Rest;
lathe duplicatior, shaper fence and shapers; SS Belt
Sander
Jim www.youtube.com/kd6vpe
The key point in Nick's excellent video on designing a dust collection system is the fact that the air flow in the pipe must be at a minimum of 3500 cfm in order to keep the dust particles suspended in the air. He has shown in practical application and mathmatically that a 3" ducted system will certainly do the job with our DC3300 in a small shop environment.
However, if you go to a 4" diameter pipe you need to have a larger and more powerful dust collector in order to achieve this flow rate. Therefore, if you run a 4" pipe from the DC3300 almost all the way to your machine, and then reduce to 2 1/2' diameter, you will likely cause dust to drop out of the air stream in the 4" pipe, and accumulate there.
For some reason the woodworking industry is "hooked" on the 4" ducted system. The March issue of Wood magazine did a review of dust collectors and their testing was of course based on the 4" pipes. They determined that only the 2 HP units tested were adequate, and gave very low marks to the lone 1 1/2 Hp unit in their line-up. Being perfectly honest with you, I feel that their review was very much advertiser driven. The top rated dust collector was the 2 HP Grizzly, who always has a two page ad on the inside front cover and first page. Duh....To quote ole Casey Stingle, "I wasn't born old!" Since the editors had titled this test of dust collectors as being for the home workshop, I sent them an email, telling them how impractical it would be for a guy who works in 1/2 of his garage to install a 2 HP dust collector and a 4" ducted system. I even gave them a link to Nick Engler's video. I doubt that they ever looked at it. They certainly did not answer my email.
So unless you are putting a hard piped dust collection system in a larger free standing shop, with perhaps more than one machine being used at a time, draw your thoughts away from thinking that you need to have 4" ducts. As Nick pointed out in his video, the DC3300, with 3" piping will do everything we need to do in dust collection for a small home shop.
