[Marv]

I have a Delta 1 1/2 hp 50-760 with an Oneida Super Dust Deputy Cyclone and 5" metal pipe. There is a 5" Y fitting on the cyclone with one line going directly to my table saw about 3 feet away with a 5" T that splits to a 4" line for the saw port and a 2 1/2" line to my overarm blade guard (each with it's own blast gate). Today I switched from using the table saw to using the router table (about 12 feet from the dust collector on the other side of the Y) and realized I forgot to close the blast gate for the overarm blade guard. When I went back to close it I noticed the suction sounded louder than it normally did so I figured I hadn't opened the router table blast gate yet however when I went back to the router table the gate was in fact open already. After a little experimenting I found something interesting...there is more suction at the 2 1/2" line on the blade guard when I open it along with any other 4" blast gate down the line than there is when I open it along with the saw cabinet 4" blast gate that is fed off of the same 5" branch. :confused1: Any ideas as to what may be going on here?

 

[Marv]

Thanks for the reply and I'll see if I can explain better! The cyclone inlet is 5" and there is a 5x5x5 "Y" attached to that. One 5" hose goes directly to the table saw where it is split to a 4" and 2 1/2" while the other 5" line goes to the machines on the other side (all are reduced to 4"). When using the table saw I open the 4" gate to the saw cabinet and the 2 1/2" gate at the blade guard with all others being closed. What I found is that when I open one of the 4" gates off of the second line and the 2 1/2" gate on the blade guard there is more suction at the blade guard than when I open the saw cabinet gate and the blade guard gate which ore on the same line. Not sure what the reason is and just curious if anyone has any ideas!

 

[Marv]

Thanks Toller and I tried that however suction gets even weaker at the blade guard. Still hoping one of you physics gurus has an idea why this happens!

 

[Marv]

Thanks guys! I have plenty of suction at the blade guard Bill however I was just curious as to why it increased when I opened a gate on a different line (I'm going to borrow some test gear just to see how much difference there actually is).
BTW Ryan, I saw your post about stabilizing your router table on the uneven floor without having to shim which is what I now do as well. I'm getting tired of bending over every time I move it so I designed a simple "4 wheel self leveling" mobile base that I'll post as soon as I get it done.