Designing your system this is a critical part and if done right you should have no problems with the system. In school, I studied fluid dynamics and the way air moves is complicated. I have read all about static pressure and how you calculate static pressure. It's not really easy and simple static pressure calculators (Flex hose is --" of static pressure per foot...), those calculators that help to make it easier are not real accurate. Even if all the calculation where correct you still need to get dust from the machines. Good or bad that's just what needs to happen. For the most part hooking a 4” pipe to the machine will get some if not all the dust that machine makes out. That makes all the calculation irrelevant because we just can’t spend thousands of dollars on 24-foot tall dust collectors that cost $5000 dollars a year to run. So you buy a smaller dust collector and use blast gates. With the exception of two machines in my shop, most dust collectors will do a good job of getting all the dust out of most machines. In my shop two machines got plugged over and over again, they were the jointer and planer. Unlike other machines, these machines make big heavy chips that are hard to get up a pipe and to a dust collector. So to help this I added a cyclone in the middle of the shop so the chips had a shorter distance to travel. The shaper is one other machine that also makes big chips but it's really close to the dust collector so it doesn't get plugged. I may add one more cyclone to shaper main line so I don’t have to empty the dust collector’s bag as often. The Dust collector bag is one of those things that really needs to be fixed. If anyone has every changed one you know what I’m talking about. Dust get everywhere and getting that ring around the bag is a pain. In my planes, you will see lots of blast gates even though they are a pain to open and close it really help to decrease static Pressure. The blast gates also help with dead air spaces that collect wood chips and saw dust. Most of my 90 deg are two 45 deg to help to lower the static pressure. I tried to use as little flex hose in the system to help with static pressure. I also used about 6 rolls of 3M Aluminum Foil Tape 3381 (for metal duck work) to help with lost suction in the joints.
The Machines that I have in my shop
- Grizzly 15" planer G04539
- Grizzly 10" Cabinet Table Saw G0690
- Grizzly 6" X 55-1/2 Jointer
- Grizzly 3 HP Shaper G1026
- Grizzly 2 HP Canister Dust Collector G0548ZP
- Dewalt 12" Chop Saw double Bevel
- Kobalt 3.7 HP 60 Gallon Air Compressor
- Almost all my hand tools are Ridgid
- Delta 31-481 26 Dual Drum Sander
I have been asked why Grizzly the cost is one for me but most machines at this level are made by the same factor in China. Attached is some common 15" planners and you will see that they are all the same with the exception of the cabinet they are identical in cutters and feed systems. I only own one Dewalt tool and that is the chop saw because I fill that it is the best chop saw out there. My hand tools are Ridgid because they work great and free batteries under the "lifetime warranty". Bad batteries really don't happen much in my experience, I'm still using batters that are 14 years old. I had a lithium battery that was 2 years old, that had the indicator charge light get stuck on and that battery would not charge after it was 100% dead. I called Ridgid they asked what the battery charger was doing when I put the battery on it and then sent a new battery without sending the bad battery back. That is great customer serves. The Detla drum sander because I owned one before and it works great, at that time it was being made by Steel City Tools but they are identical sanders in every way.
This is my opinions and not everyone needs to agree with them. I am always open for a discussion on why you agree or disagree with me.